574 FXUS66 KSEW 312046 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 146 PM PDT Fri Jul 31 2026 .SYNOPSIS...An upper ridge will shift east tonight. A front will move across the area on Saturday, with increasing onshore flow into Sunday. Upper level ridging builds offshore Sunday night and moves over Western Washington on Monday. The ridge will remain in place through at least midweek for dry, warm conditions. && .SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...Mostly sunny skies across Western Washington this afternoon with temperatures in the 70s to low 80s. High pressure will move east of the Cascades into tonight ahead of a frontal system. The front moves across the area on Saturday, resulting in increased light rain, especially for the Olympic Peninsula, Cascades, and from Snohomish County northwards. There is also a 10-20% chance for thunderstorms over the northern Cascades Saturday afternoon. In addition, winds will be rather breezy in a post-frontal airmass, with west wind gusts ranging 15 to 25 MPH (with localized gusts to 30 MPH) on Saturday. Onshore flow continues post-front later Saturday into early Sunday, resulting in the development of weak convergence over Snohomish County and vicinity. Light rain may continue at times into Sunday morning for this region before drier conditions return by Sunday afternoon. Upper level ridging then begins to build offshore by Sunday night. Temperatures will be quite a bit cooler this weekend, with highs only in the mid 60s to mid 70s. && .LONG TERM /MONDAY THROUGH FRIDAY/...The upper level ridging continues to build over Western Washington early next week, resulting in drier, warming conditions. Widespread Minor HeatRisk is expected Monday, with areas of Moderate HeatRisk Tuesday and Wednesday. Upper level flow also transitions more northeasterly on Monday, which may result in increasing wildfire smoke into midweek, this continues to be monitored. Some uncertainty exists in ensembles by later next week in regards to the ridge flattening a bit for a slight cooling trend. Either way, continued dry conditions are expected through late week. JD && .AVIATION...Southwest flow aloft will increase tonight as a weak frontal system approaches from the west and pushes inland Saturday morning. Ceilings will lower to MVFR along the coast late tonight then spread inland across the interior lowlands early Saturday morning. Gusty post-frontal west to southwesterly surface winds are expected at times on Saturday and a convergence zone is expected to develop later Saturday afternoon into Saturday night. KSEA...VFR will continue into this evening. Ceilings are expected to lower to MVFR near or after 12Z Saturday and persist into at least early afternoon. Surface winds west to northwest 6 to 10 knots will back to southerly overnight and rise to 10 to 15 knots with gusts to 20 knots by mid-morning Saturday before easing late in the day. 27 && .MARINE...A weak frontal system will reach the waters tonight and Saturday. Increasing onshore flow will lead to small craft advisory westerly winds in the central/east strait late this afternoon and evening and again much of Saturday. Additionally, post-frontal onshore flow will lead to small craft advisory southwesterlies in Puget Sound/Hood Canal during the day on Saturday. High pressure will rebuild over the coastal waters Sunday and remain in place into early next week as thermally induced low pressure expands northward across the interior. 27 && .FIRE WEATHER...Elevated fire weather concerns will continue today as a warming and drying trend peaks. Relative humidities will drop into the upper 20s and 30s over portions of the western Cascades and lowlands south of the Puget Sound, though an approaching system will bring onshore flow tonight with healthy overnight humidity recoveries. A frontal system will cross western Washington Saturday morning, bringing a chance of wetting rain to the northern Olympic Peninsula and North Cascades, alongside breezy winds area-wide and increased onshore flow. Ridgetops in the Cascades will see wind gusts of 30 to 40 mph Saturday afternoon, though incoming cooler and wetter conditions will prevent humidities from reaching critical levels. In addition, the North Cascades will see a 20% chance of thunderstorms developing midday Saturday, though widespread lightning is not expected with this system. A ridge will build over the western US during the first half of next week, bringing additional warming and drying to the region. Minimum relative humidity values will drop into the 20s and 30s for most inland areas, bringing elevated fire weather concerns. Surface flow is also expected to turn offshore, though flow will be fairly weak. Northerly and easterly winds at times may bring in smoke from wildfires across eastern Washington and British Columbia. 15 && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 7 PM PDT Saturday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from 5 AM to 7 PM PDT Saturday for Puget Sound and Hood Canal. && $$

598 FXUS66 KPQR 311753 AAA AFDPQR Area Forecast Discussion...UPDATED National Weather Service Portland OR 1053 AM PDT Fri Jul 31 2026 Updated Aviation Discussion... .SYNOPSIS...A progressive weather pattern with prevailing onshore flow continues through the weekend. Broad southwest flow aloft will allow temperatures to peak in the mid to upper 80s today before a frontal system slated for Saturday ushers in cooler temperatures, chances for light rain, and locally gusty west winds over the weekend. Wind related impacts are highest in the central Columbia Gorge. Trailing this frontal system, a broad pattern change favoring warmer and drier weather is expected by the middle of next week with a period of northerly to northeasterly winds as well - a combination we`ll have to watch closely. && .SHORT TERM...Now through Saturday Night...The Pacific Northwest remains on the western periphery of a building ridge of high pressure today as an upper-level low looms over the northeastern Pacific. Still, the influence of the ridge just to our east and broad southwesterly flow aloft will allow for temperatures to jump day to day with high confidence in afternoon temperatures reaching into the mid to upper 80s across the Willamette Valley, Portland Metro, southwest Washington, and other inland valleys. The two former areas have at least a decent shot at maxing out around 90 degrees too (20-45% chance). While these temperatures will be warmer than the last several days, we are not expecting any record breaking heat but rather just slightly above normal and rather temporary in the context of what is expected this weekend. On Saturday our focus shifts to the aforementioned upper-level low over the northeastern Pacific which as it tracks into British Columbia swings a weak cold front into the region to start the weekend. Beyond causing temperatures to lower, the tightening surface pressure gradient across the Cascades forces west winds to increase significantly for some select locations. These areas include the Upper Hood River Valley, Columbia River Gorge, and gaps in the Coast Range. If we look at the NBM 90th percentile (10% chance of occurring), gusts could reach as high as 45 mph in Hood River and the more exposed terrain in the Central Gorge. For the Willamette Valley, there is a 10% chance of gusts up to 25 mph but based on the wind direction, for most areas this may be a bit overdone. In addition to the wind, light rain is expected with the frontal passage though accumulation will be minimal, generally less than 0.05-0.10in for the vast majority of locations, if you even see anything at all. Overall looking at high confidence (>80%) for the north coastal areas for accumulating light rain, 30-60% for southwest Washington, and less than 10% for most of the interior portions of Oregon. -99/27 .LONG TERM...Sunday through Thursday...The broader upper-level low feature passing to our north continues to influence the region on Sunday with similarly cool conditions overall compared to the start of the weekend - very little in the way of weather related impacts. However, Monday and Tuesday will see more change. Early next week the progressive upper trough exits eastward while a ridge of high pressure amplifies over the eastern Pacific and Four Corners region. It`s around this point deterministic and ensemble systems begin to show growing deviations in the upper-level pattern going forward which leads to higher forecast uncertainty by the middle of the week. While temperatures are very likely to be warmer compared to the weekend, the spread of potential solutions remains somewhat broad, especially on Wednesday. At this point, there is an 80-90%+ chance of highs in the 80s within inland valleys on Monday and a 75-80% chance of meeting of exceeding 90 on Tuesday. Mid to late week it`ll all come down to the exact pattern amplification and longitudinal placement of the ridge over the far eastern Pacific. In the warmer solutions (favored by GFS and more GEFS members), stronger inland ridging and the resulting coastal thermal trough may be sufficient to drive decent offshore flow and potential gusty north to northeast winds along the coast and within the Willamette Valley. The EPS keeps this ridge flattened comparatively but still shows a signal for north to northeast winds, albeit weaker. At least the bulk of deterministic and ensemble guidance depict a return to W-NW winds by late Thursday signaling moderating conditions. From a fire weather prospective the pattern early to mid week does raise some concerns, especially on Tuesday, as notable N-NE winds during the afternoon hours and minimum relative humidity values below 25% could combine for a period of elevated to critical fire weather conditions in the central and southern Willamette Valley (a 30-50% chance according to the latest NBM). Much of this hinges on the placement/strength of the ridge axis and accompanying near surface thermal trough over southwest Oregon as mentioned earlier. Additionally, the weak offshore component to the low to mid level flow (surface to 700mb) has the potential to adversely impact overnight humidity recoveries in the Cascades, adjacent foothills, and tops of the coast range. We`ll have to watch this late Monday through Wednesday period closely the next several forecast cycles as models converge on a solution and forecast confidence increases. -99 && .AVIATION...Through 18Z Saturday...Widespread VFR conditions with clear skies and coastal stratus hanging away from the coast. While inland terminals will continue to see VFR conditions through the TAF period, coastal terminals will begin to see conditions deteriorate towards MVFR/IFR/LIFR condition around 02-04Z Sat as onshore flow pushes the low stratus towards the coast. Guidance currently shows a 50-60% chance of MVFR conditions around 02-03Z Sat increasing to around 80-90% by 07-09Z Sat. Additionally, there is a 30-50% chance of IFR and 20-30% chance of LIFR conditions beyond 02Z Sat. Otherwise, expect winds around 5-10 kt through the period, northwesterly through the afternoon, then shifting westerly to southwesterly by 03-06Z Sat for most terminals. KPDX AND APPROACHES...Clear skies and VFR conditions will continue through the period, with northwest winds generally 5-10 kts shifting to southwesterly around 12Z Sat. ~12 && .MARINE...Fairly benign conditions continue across the waters today as winds remain out of the W-NW. Headed into the first half of the weekend a frontal system approaching the waters brings increasing winds, mainly for the outer waters and the inner waters north of Cape Falcon. Chances for rain peak Saturday morning during the frontal passage, likely dissipating during the afternoon hours. Behind the boundary, initial westerly flow will veer out of the north by Sunday as surface high pressure builds offshore. Chances for maximum wind gusts of at least 21 kt are around 70-90% from Sunday afternoon/evening through at least Tuesday evening - highest probabilities outer waters. We`ll still have to watch for a period of marginal Gale Force northerly winds late Monday afternoon (5-25% chance south of Cape Foulweather). Wave heights through this time period remain around 5-7 ft at 7-9 seconds. -99/12 && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...None. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

406 FXUS66 KMFR 311718 AFDMFR Area Forecast Discussion National Weather Service Medford OR 1018 AM PDT Fri Jul 31 2026 ...Aviation Discussion updated... .KEY MESSAGES... * Mainly sunny and hot today with highs inland running about 3-7F above normal. * A dry cold front will bring slight cooling Saturday, but also breezy to gusty winds, highest east of the Cascades resulting in critical fire weather conditions. * A thermal trough pattern Sunday into early next week will bring gusty north to northeast winds to the Umpqua and Illinois valleys, and the Oregon coast. Sunday will probably be the coolest day for most areas, except SW sections as offshore flow develops. * Temperatures increase early next week, with a warm Chetco effect (80s in Brookings) Monday and the hottest temperatures inland Tue/Wed, then remaining above normal through Friday. * Thunder chances remain very low (less than 5%) for the next 7 days. && .DISCUSSION...Satellite imagery shows mainly clear skies across the area early this morning with patchy marine stratus, mainly over the offshore waters, but also affecting some coastal locations. A strong upper ridge over the Desert Southwest will nudge toward the area today, so expect plenty of sunshine and temperatures warmer than yesterday, at least over inland areas (about 3-7F above normal). Our forecast for Medford is 99F for a high this afternoon. Meanwhile, low pressure is centered in the Gulf of Alaska near 51N and 140W. This system will gradually move east toward the British Columbia coast and eventually drag a mostly dry cold front across the area Saturday. From the Cascades west, temperatures should drop back to near or even slightly below normal levels. A deeper marine push is expected Saturday morning into the Umpqua Basin (and also at the coast), so the day will likely begin with lower stratus. There is even a chance at some drizzle at the coast, but this is most likely from around Reedsport northward, up around Florence and/or Newport. Overall, for areas inland west of the Cascades in SW Oregon, expect highs about 10F lower than on Friday. We still expect very dry air to persist east of the Cascades despite a slight cooling trend. With the increase in wind speeds expected ahead of the front, critical fire weather conditions should develop in the afternoon/evening. See fire weather discussion below for more specifics. After Saturday`s frontal passage, a thermal trough pattern will set up Sunday into early next week. Sunday will remain cooler than normal for most and probably will be the coolest day of the stretch for all but southern and western sections. This pattern will bring stronger offshore (NNE) winds to areas west of the Cascades, especially the Umpqua Basin, Illinois Valley and the coast/coast ranges. This will mean a better chance for winds aligning with the Chetco and a good shot at a warm Chetco effect on Monday (highs in the 80s at Brookings). The thermal trough will likely push inland Tuesday/Wednesday, so it will warm up quite a bit over the interior with triple digit heat a possibility again for the Rogue Basin. Uncertainty develops at midweek in terms of how strong upper ridging will be. Most of the guidance shows a flatter ridge with temperatures remaining above normal with moderate heat risk into late next week, but some strengthen the ridge enough to bring potential for heat related products. We`ll continue to monitor this. The good news is we still are not seeing any chance for thunderstorms in the next 7 days (probably even longer). Models continue to maintain a dry atmosphere with all the monsoonal moisture remaining bottled up across the Desert Southwest and Four Corners region. -Spilde && .AVIATION...31/18Z TAFs...VFR prevails areawide through this afternoon. Along the coast and over the coastal waters, IFR/MVFR stratus is expected to develop this evening and spread into northwestern portions of the the Umpqua Basin early Saturday morning. Current models and guidance keep VFR at Roseburg with MVFR staying to the northwest. However, there is a low (15%) for MVFR to develop between 12-17z. Elsewhere, VFR will prevail through the TAF period. && .MARINE...Updated 300 AM PDT Friday, July 31, 2026...Light to moderate north winds and seas are expected today, highest south of Cape Blanco. Low pressure passing to the north will produce stronger northerly winds Saturday afternoon/evening with steep seas expected by Saturday night, again south of Cape Blanco. Gales and very steep seas are highly likely Sunday into Monday south of Cape Blanco, and periods of storm force gusts possible. Gusty winds and steep seas look to spread north of Cape Blanco then. -TAD/Spilde && .FIRE WEATHER...Updated 300 AM PDT Friday, July 31, 2026...The main fire weather concern will be the passage of a dry cold front Saturday. As with most dry fronts this time of year, gusty winds are expected to accompany its passage, with gusts up to 20 mph expected west of the Cascades, and of 25 to 35 mph to the east. While the front will bring some slightly improved humidities to the area (west of the Cascades), conditions will be very close to critical levels for some locations east of the Cascades, especially from the Fremont National Forest eastward. As a result, we have added a Fire Weather Watch to southeast portions of FWZ 624 and all of FWZ 625. We may also last minute include FWZ 285 if it looks like winds/rh line up there too. Winds should decrease a bit Sunday. -Spilde && .MFR WATCHES/WARNINGS/ADVISORIES... OR...Fire Weather Watch from Saturday afternoon through Saturday evening for ORZ624-625. CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory from 2 PM Saturday to 5 PM PDT Sunday for PZZ356-376. && $$

125 FXUS66 KEKA 312129 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 229 PM PDT Fri Jul 31 2026 .KEY MESSAGES... * Hot temperatures return early next week with widespread Moderate to locally Major HeatRisk through mid week * Elevated fire danger returns Saturday and into next week with periods of breezy winds and increasingly hot, dry conditions. * Westerly to northeasterly winds through the weekend and into Monday will bring the greatest fire weather risk. && .SYNOPSIS...Temperatures will be trending higher over the next week with moderate to major HeatRisk possible early next week. Hot interior temperatures in combination with periods of breezy winds this weekend through Monday with increase the fire weather risk. && .DISCUSSION...Northwest California continues to be affected by an upper level trough centered over the Gulf of Alaska and an upper level ridge centered over the Southwestern US. High pressure will edge more westerly today and tomorrow, warming temperatures well inland by a few degrees. Closer to the coast, the general west to northwest flow at the surface is expected to keep the coastal counties closer to normal. However, since most stratus is clearing or scattering, coastal areas could still heat up to above normal for another day (so far, another high temperature above 67 has been recorded at Woodley Island). Stratus is forecast to quickly push inland tonight. Saturday, the upper level trough and associated frontal boundary will continue into the Pacific Northwest. For Northwest California, the front is expected to be relatively dry; however, could bring some drizzle where the marine layer persists. Saturday afternoon, north winds are anticipated to increase with gusts of 20 to 25 mph along the coast. Saturday night into Sunday, northeast winds are expected to pick up over the ridges, especially in Del Norte and Humboldt counties. Sunday afternoon these winds are expected to become northwest again and continue to increase. Sunday night, another trough is forecast to traverse the Pacific Northwest. Behind the trough, surface high pressure starts to build over the eastern Pacific well offshore bringing some of the strongest northeast winds by Monday morning in Del Norte and Humboldt counties. The 850 MB winds on the NAM increase to around 20 to 25 kt with low RH over the higher terrain. This will likely keep the coastal areas clear due to offshore flow. Hot inland temperatures are forecast with highs over 100 for many of the valleys across the area bringing fairly widespread areas of moderate HeatRisk. Warmer conditions will continue Tuesday, which has the potential to be the hottest day. High temperatures of 100 to 107 are expected in the valleys. Winds are expected to be lighter at the coast Tuesday which would allow warmer temperatures to get closer to the coast. The alternate scenario, of course, is that the marine layer returns sooner than expected keeping temperatures cooler. Wednesday, inland areas will start to cool by a few degrees as the ridge starts to get flattened. MKK & JLW && .AVIATION...Coastal stratus will continue to clear and scatter along the coast leaving VFR conditions for coastal terminals through the afternoon and early evening. However, the ever present stratus layer will reform and migrate back onshore mid to late this evening. IFR conditions are most likely to affect coastal terminals overnight. VFR conditions are anticipated for inland terminals. && .MARINE...Advisory level northerly winds will continue for the southern marine zones. Winds in the northern zones will remain slightly elevated through today, but still be below advisory level. Northerlies will increase throughout all zones by Saturday with gale force gusts expected south of Cape Mendocino by the afternoon. Saturday night and Sunday Gale Conditions are forecast to expand to the northern outer waters. Monday afternoon fairly strong gales are expected across all marine zones. Winds are expected to begin diminishing by Tuesday. Winds are expected to be around 10 to 20 kt for much of the rest of the work week. In addition to the steep wind driven waves there is a southerly swell. Currently the Cape Mendocino buoy is showing it around 2 feet at 14 seconds. This may build to around 3 feet today before slowly diminishing into the middle of next week. MKK && .FIRE WEATHER...Lighter winds and gradually increasing overnight relative humidity recoveries are expected through Saturday morning as a trough approaches the Pacific Northwest. Stronger marine layer pushes into the near-coast valleys and along coastal ridges are likely Friday and Saturday mornings. Farther inland dry air will remain in place with afternoon relative humidity values falling into the teens on Friday. As the trough moves through the region on Saturday the pressure gradient will tighten resulting in stronger afternoon westerly winds with chances for gusts over 25 mph increasing to 50 to 70% for a good portion of the interior Saturday afternoon. Thankfully the west- northwesterly winds will also bring slightly increased relative humidity with minimums in the 20s instead of teens. This will keep the fire threat from becoming critical. Sunday night into Monday morning is starting to look like a more critical time period, especially on the ridges of Del Norte county. Gusts of 30 to 40 mph are are possible on the ridges and possible the northeast aligned drainages. The is also expected to be fairly dry. The challenge at this point is determining where the inversion will be with dry and breezy conditions above and much calmer and with higher RH below it. This will need to be monitored as it gets closer. This will also impact the interior ridges of Humboldt, and Trinity counties. RH will trend much lower across the interior to the low teens and likely some single digits by Monday and then remaining dry into mid next week. Afternoon west-northwesterly gusty winds can be expected each afternoon. These winds are not expected to be more than typical for the summer only lasting a few hours and not as strong as Saturday. MKK/RPA && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 3 PM Saturday to 3 AM PDT Monday for PZZ450. Small Craft Advisory until 9 AM PDT Saturday for PZZ455-475. Gale Warning from 9 AM to 9 PM PDT Saturday for PZZ455. Small Craft Advisory from 9 AM to 9 PM PDT Saturday for PZZ470. Gale Warning from 9 PM Saturday to 3 AM PDT Monday for PZZ470. Gale Warning from 9 AM Saturday to 3 AM PDT Monday for PZZ475. && $$ NOTE: The full forecast discussion is now regularly issued between 10 am/pm and 1 pm/am. Additional updates will be issued as needed. Visit us at https://www.weather.gov/eureka Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png

358 FXUS66 KMTR 311952 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1252 PM PDT Fri Jul 31 2026 ...New SHORT TERM, LONG TERM... .KEY MESSAGES... Updated at 1251 PM PDT Fri Jul 31 2026 - Gradual warming trend through the weekend with Moderate HeatRisk in the interior through the early part of next week - Elevated fire weather threat across the interior North and East Bays, and the Diablo and Santa Lucia ranges through the early part of next week - Hazardous beach conditions across the Pacific Coast with an increased risk for sneaker waves and rip currents through Saturday - Strong and gusty winds develop over coastal waters north of Point Reyes this weekend && .SHORT TERM... Issued at 1251 PM PDT Fri Jul 31 2026 (This evening through Saturday night) Patches of stratus persist across the coast of the San Mateo Peninsula and the Monterey Bay region, where an eddy over the bay is keeping the stratus in place for a little while longer. Across the region, skies are generally clear with smoke impacts from the Woodside Fire observed across the Sonoma County valleys, and to a lesser extent across the North Bay. A gradual warming trend continues today as the high pressure system over the Desert Southwest continues to impact our weather pattern. Highs today range from the 90s in the inland valleys, up to 104 in the warmest spots of southern Monterey and San Benito counties, to the middle 70s to lower 80s near the Bays, and the middle 60s along the Pacific coast. Gusty onshore winds will develop this afternoon and evening, with gusts reaching 25 to 35 mph along the coast, through gaps and passes, within the Salinas Valley, and at the ridgelines. High temperatures will be a couple degrees warmer on Saturday, with triple digit highs possible in isolated locations in the far interior North and East Bays, with winds ramping up in the coastal waters as a passing trough tightens the pressure gradient. With the stronger winds now coming into the domain of more of the higher resolution modeling suites, the forecast is calling for more widespread gale force gusts with isolated storm force gusts possible in the northern outer waters. Regarding the Woodside Fire, northwest winds will continue to impact the wildfire site through the day with gusts of 25 to 30 mph expected this afternoon and evening. Along the immediate coast, temperatures will cool to the middle 50s with fair overnight humidity recoveries. Poorer conditions are possible in the higher elevations, where the thermal belts will result in poor humidity recoveries and low temperatures in the middle 60s to lower 70s. In terms of smoke impacts, high resolution HRRR model output depicts smoke transport generally driven by northwest winds parallel to the Sonoma County coast before the local wind pattern brings the smoke through the Petaluma Gap into the North Bay valleys. For air quality information, refer to products issued by the Northern Sonoma County Air Pollution Control District within northern and western Sonoma County, and the Bay Area Air Quality Management District in the rest of the North Bay and SF Bay Area. Patches of Moderate HeatRisk are expected to develop across the interior today, followed by more widespread Moderate HeatRisk in the interior Saturday through the early part of next week. This corresponds to a moderate risk for heat related illnesses for sensitive populations, including children, the elderly, pregnant women, people with certain medical conditions, and people who work or live outdoors without adequate shelter or hydration. Considered issuing a Heat Advisory for the weekend, but at this point there hasn`t been enough forecast coverage of the Moderate HeatRisk to pull the trigger on issuing the Heat Advisory as of yet. Follow these tips to avoid heat-related illnesses: * Stay hydrated and drink plenty of fluids. * Wear lightweight, light-colored clothing. * Reduce time spent outdoors or stay in the shade. * Never leave people or pets unattended in vehicles. * Use sunscreen if going to the coast or the pool. As a final note, beach hazards and fire weather concerns continue into the weekend. See the BEACHES and FIRE WEATHER sections for more details. One less spark, one less fire, and never turn your back to the ocean! && .LONG TERM... Issued at 1251 PM PDT Fri Jul 31 2026 (Sunday through next Thursday) The heat continues into Sunday and Monday as the trough passes by far to the north across western and central Canada, leaving the ridging pattern generally intact through the early part of next week. The current forecast shows a gradual cooling trend beginning on Tuesday, but model ensemble cluster analysis generally agrees on some form of ridging staying in place through the next week, with the end result that temperatures are slow to drop and could remain slightly above the seasonal average through the first week of August. The upper level pattern could bring us a couple of offshore bursts over the region, with a notable pulse Sunday night into Monday particularly across the North Bay and SF Bay regions. Fire weather concerns regarding nocturnal drying and downslope warming are obvious, but that downslope warming could also cause coastal temperatures to be much warmer than the forecast if it extends through Monday. && .AVIATION... (18Z TAFS) Issued at 1122 AM PDT Fri Jul 31 2026 Skies remain clear for the most part throughout the day. North Bay terminals will be the most impacted by smoke from the Woodside Fire on the Sonoma County coast. STS will experience visibility impacts (~5-6SM) due to smoke through the TAF period meanwhile APC will see more haze. Moderate onshore winds increase by the afternoon and ease around sunset. A compressed marine layer around 1000 feet returns this evening with high confidence in IFR ceilings at coastal terminals (HAF, MRY, and SNS). Medium confidence on MVFR ceilings at North Bay terminals. The amount of smoke in the air combined with increasing 500 mb heights and a compressed marine layer, may allow for sufficient subsidence to form MVFR ceilings. Interior South and East Bay valleys remain VFR this TAF period. Vicinity of SFO...VFR through the afternoon as westerly winds increase. NW breezes off our coast increase overnight which may be sufficient enough to push IFR ceilings over OAK and SFO. IFR ceilings impact OAK first, followed by SFO around 07-10Z Saturday. Medium confidence on exact timing of stratus arrival. Ceilings are expected to mix out by mid-morning Saturday. SFO Bridge Approach...Similar to SFO. Stratus coverage may remain more SCT008-010. Monterey Bay Terminals...VFR through the day! Onshore breezes around 10-12 kt increase through the afternoon. Medium confidence on the arrival of IFR ceilings tonight, though they are expected to arrive at MRY first before filling in over SNS. Both terminals clear by mid- morning Saturday. && .MARINE... (Today through Wednesday) Issued at 934 AM PDT Fri Jul 31 2026 Fresh northwest breezes strength by Saturday into gale force across the northern waters and strong in the southern coastal waters. Wind driven moderate seas build to very rough by Sunday in response to the stronger winds. Occasional storm force gusts are likely in the northern waters. Wind and very rough seas gradually subside by mid next week. Distant tropical activity continues to send long period swells to our coastal waters. && .FIRE WEATHER... Issued at 1216 PM PDT Thu Jul 30 2026 The overall fire weather picture remains similar to the previous discussion, with elevated fire weather threats persisting at the higher elevations through the weekend and possibly beyond. Overnight RH recovery remains moderate to poor at locations at or above 2,000 feet with values between 35 to 45 percent, with some favored locations struggling to even reach 25 percent. This will be particularly true across the Mayacamas, highest peaks of the East Bay Hills, the Diablo Range, the Santa Cruz Mountains, the Santa Lucia and Gabilan Ranges. Nocturnal drying (rapid decrease in RH through the pre- dawn hours) may also transpire which will increase the burn period or time in which fire behavior may remain active. Afternoon RH remains critically dry with values between 15 and 30 percent, with far southern portions of the interior Central Coast potentially seeing min RH near 10 percent. Energy Release Components (ERC) are projected to climb above the 97th percentile across the interior Central Coast. Individuals across the area are advised to avoid activities that may spark a fire. Fire crews are urged to exercise extra caution when executing any prescribed burns, especially where fuels, topography, and weather align. && .BEACHES... Issued at 1216 PM PDT Thu Jul 30 2026 Long period southerly to southwesterly swell of 14-17 seconds continues to impact our coastline through at least Saturday afternoon, bringing hazardous beach conditions to the Central Coast and the San Francisco Bay Area. Sneaker waves and strong rip currents will be the primary threats, with breaking waves up to 10 feet along some south and southwest facing beaches and break points, such as Santa Cruz, Pacifica, and parts of Stinson or Ocean Beach. This can be particularly surprising when wave heights increase suddenly after a period of seemingly tranquil wave action. In fact, sneaker waves can have 20+ minutes in between the larger sets (breaking waves) with significant "flat/calm looking" times between them. Due to the long period, sneaker waves are powerful and can catch beachgoers by surprise, resulting in people and pets being swept into the cold, turbulent ocean. Rip currents are strong enough to pull even the strongest swimmers away from shore. Check marine conditions before you head out! Swim near a lifeguard, if possible. Maintain a safe distance from the water, and stay away from jetties, piers, beachside rocks, and other waterside infrastructure. Never turn your back to the ocean and if you have small children or pets at the beach, please keep an eye on them. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Beach Hazards Statement through Saturday afternoon for CAZ006- 505-509-529-530. PZ...Small Craft Advisory until 9 AM PDT Saturday for Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM. Gale Warning from 9 AM to 9 PM PDT Saturday for Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory until 9 PM PDT Saturday for Pt Reyes to Pigeon Pt 0-10 nm. Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt to Pt Pinos 0-10 nm. Small Craft Advisory from 9 AM to 9 PM PDT Saturday for Pigeon Pt to Pt Pinos 0-10 nm. Small Craft Advisory until 3 PM PDT Saturday for Pt Pinos to Pt Piedras Blancas 0-10 nm. Gale Warning from 3 PM to 9 PM PDT Saturday for Pt Pinos to Pt Piedras Blancas 0-10 nm. Small Craft Advisory until 9 PM PDT Saturday for Pigeon Pt to Pt Pinos 10-60 NM. && $$ SHORT TERM...DialH LONG TERM....DialH AVIATION...Navarrete MARINE...Navarrete Visit us at www.weather.gov/sanfrancisco Follow us on Facebook, X, and YouTube at: www.facebook.com/nwsbayarea x.com/nwsbayarea www.youtube.com/nwsbayarea

996 FXUS66 KOTX 311948 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 1248 PM PDT Fri Jul 31 2026 .KEY MESSAGES... - Hot, dry conditions for Friday push temperatures into the upper 80s to mid 90s. - Widespread critical to extreme fire weather conditions on Saturday. - Elevated fire weather conditions on Sunday. && .SYNOPSIS... An upper-level ridge over the Inland Northwest on Friday, boosts highs back into the upper 80s to mid 90s. A robust cold front on Saturday will drive strong surface winds and bring low humidity across the region, creating widespread critical to localized extreme fire weather conditions. Temperatures cool by 8-12 degrees on Sunday, though lingering breezy winds will keep fire weather conditions elevated. Warm, dry conditions return for start of next week. && .DISCUSSION... ...Strong winds and dry conditions leading to critical to extreme fire weather conditions Saturday... Today: A broad ridge is stretching across the Pacific Northwest with the apex centered over Western MT. It will continue to promote the dry, warm pattern that has been in the Inland Northwest since Wednesday. 850mb max temperatures range from 22-24C on Friday. It will keep temperatures in the upper 80 to 90s for most. Lewiston has around a 50% probability of reaching triple digits. Areas being impacted by wildfire smoke could have a few degrees shaved off the forecast high. HeatRisk remains minor to moderate across the region. Afternoon winds will increase with weak afternoon thermal lows will bring brief increases to winds with gusts reaching into the teens. Overnight lows will be in the 60s. Saturday: It continues to be main focus for the upcoming weekend. There is high confidence for the winds on Saturday. Ensembles continue to swing a strong +120kt upper level jet across WA as a Low swings into the Lower BC. Any chance of precip across the region will limited to the Cascade Crest. The Low will push a strong dry cold front through the Inland Northwest with 850mb-500mb winds ranging from 30-60kts. The winds will mix down to the surface as the front passes. Westerly winds will begin to increase in the late morning and continue into the evening. Timing for the strongest winds will be in the afternoon to early evening hours. Ensembles have been very consistent with speeds and timing. For speeds, sustained winds will be in the 20 to low 30 mph range. Weaker winds in the teens will be over the Lower Idaho Panhandle. For gusts, a range of 30 to low 40s for most. The Lower Idaho Panhandle will have gusts into the 20s. Outside of the Lower Idaho Panhandle, probability of wind gusts greater than 35 mph is at least 60 percent. Southeast Washington, Lewiston, and Western Columbia Basin including Waterville Plateau down to Wenatchee has 20-40 percent probability for greater than 50 mph gusts. Outside of fire weather concerns, impacts include blowing dust and minor tree and property damage. It will be something to keep an eye on for the next model runs. Highs for the day will be in the slightly cooler with a range of upper 70s to low 90s. Overnight lows will be in the 40s to 50s. Sunday: While temperatures will be a lot cooler, winds will continue to be breezy. The region will see winds sustained in the teens with gusts into the 20s continuing to impact ongoing and new fires in the area. Winds will shift to out of the north and funnel down the Okanogan across the Waterville Plateau bringing locally higher speeds with gusts into the 30s. Highs will be in the 70s to mid 80s. Overnight lows will be in the 40s to mid 50s. Monday through Wednesday: A flat ridge will fill in behinds the exiting Low. Temperatures will rebound back into the 80s to low 90s. Winds will continue the diurnal trend of breezy afternoons and calm overnights. The warm, dry pattern will continue with no chances of beneficial precip for the start of August. Overnight lows will be in the 50s. /JDC && .AVIATION... 18Z TAFS: Mainly VFR through the 18z TAF cycle with generally light and diurnally driven winds across the region. Regional wildfire smoke will remain present and may occasionally mix down to the surface, particularly between 18z and 03z. A cluster of larger fires across north-central Washington may result in visibilities 3-6SM between Methow Valley (KS52) to KOMK and Colville (K63S). Elsewhere, visibilities may periodically dip to 5-7SM, particularly at KPUW/KLWS and KMWH. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence in light wind speeds and diurnally driven wind shifts. Moderate to high confidence in VFR visibilities prevailing at the TAF sites except KEAT. ----------------------- Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance For additional probabilistic information for NWS Spokane airports, please refer to the Aviation Dashboard on our webpage: https:/www.weather.gov/otx/avndashboard && .Preliminary Point Temps/PoPs... Spokane 60 87 51 77 50 82 / 0 0 0 0 0 0 Coeur d`Alene 61 87 52 77 51 81 / 0 0 0 0 0 0 Pullman 54 83 45 73 43 79 / 0 0 0 0 0 0 Lewiston 65 93 57 80 53 85 / 0 0 0 0 0 0 Colville 53 89 44 80 44 83 / 0 0 0 0 0 0 Sandpoint 57 86 48 76 45 80 / 0 0 0 0 0 0 Kellogg 59 84 49 71 48 76 / 0 0 0 0 0 0 Moses Lake 60 88 50 81 52 84 / 0 0 0 0 0 0 Wenatchee 66 84 56 80 56 86 / 0 0 0 0 0 0 Omak 63 91 50 82 53 85 / 0 0 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...Red Flag Warning from 11 AM to 11 PM PDT Saturday for Colville Reservation (Zone 702)-Eastern Columbia Basin -Palouse - Spokane Area (Zone 708)-Foothills of Central Washington Cascades (Zone 705)-Foothills of Northeast Washington (Zone 701)-Lower Palouse -Snake River (Zone 709)-Methow Valley (Zone 704)-Okanogan Highlands and Kettle Mountains (Zone 699)-Okanogan Valley (Zone 703)-Selkirk Mountains of Northeast Washington (Zone 700)-Waterville Plateau (Zone 706)-Western Columbia Basin (Zone 707). Air Quality Alert until further notice for Asotin, Chelan, Douglas, Ferry, Okanogan, Pend Oreille, Stevens, Grant, Lincoln, and Spokane. Counties Red Flag Warning from 11 AM to 8 PM PDT Saturday for East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697)-East Washington Central Cascades (Zone 696)-East Washington North Cascades (Zone 698). ID...Red Flag Warning from 11 AM to 11 PM PDT Saturday for Northern and Central Idaho Panhandle (Zone 101). Air Quality Alert until noon Monday for Latah, Lewis, and Nez Perce Counties. && $$

517 FXUS66 KPDT 312149 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 249 PM PDT Fri Jul 31 2026 .KEY MESSAGES... - Extreme fire weather concerns Saturday. *Red Flag Warnings Issued* *Particularly Dangerous Situation (PDS) Red Flags issued* - Windy conditions Saturday. *Wind Advisories issued* - Dry conditions return early next week. && .DISCUSSION... Current radar and visible satellite imagery shows dry conditions under smoky skies for much of the region. This is in response to a transient upper level ridge building today in the wake of the passing shortwave that brought additional cloud cover and breezy winds yesterday. The ridge is short-lived and is in front of a robust upper level low pressure system that will move onshore over the southern British Columbia coast Saturday morning and afternoon. A dry cold front at the surface is associated with this upper level low, and will pass through the Pacific Northwest from northwest to southeast through the afternoon and evening. This frontal passage is moving into a very dry air mass, and will bring with it strong winds out of the west. These parameters, coupled with additional instability associated with the frontal boundary and prolonged antecedent dry conditions, will promote extreme fire weather concerns which could lead to rapid fire spread for new and existing fires. Thus, multiple Red Flag Warnings have been issued from 11 AM to 11 PM across the Lower Columbia Basin, Blue Mountains, Central Oregon, John Day Basin, Grande Ronde Valley, Wallowa County, portions of the east slopes of the Oregon Cascades, and the Yakima/Kittitas Valleys. Expected high winds across the Lower Columbia Basin, Blue Mountains Wallowa/Union counties, Yakima/Kittitas Valleys, and portions of Central Oregon pose a Particularly Dangerous Situation (PDS) related to fire weather concerns, with the potential for catastrophic impacts related to wildfire spread. The NBM suggests a 60-90% chance of sustained winds of 25 mph in these areas, coupled with afternoon humidities in the mid-teens. Gusts are also expected to reach between 35-55 mph in these areas. Make sure to stay aware of the weather, and have multiple ways to receive or attain weather information. The cold front will bring strong winds to the area, with highest winds expected to occur across the Kittitas Valley, Simcoe Highlands, Blue Mountain foothills, and the Lower Columbia Basin. Sustained winds of 25 to 35 mph with gusts up to 55 mph will be possible, peaking between 3PM-7PM. The GFS, SREF, and NAM all advertise a pressure gradient of 10-13mb between Portland and Spokane, which provides additional confidence in the wind forecast. Winds will stay elevated through the remainder of the evening before subsiding around midnight and continuing to drop overnight. Conditions moderate on Sunday as a cooler and less dry airmass briefly moves over the region behind the exiting cold front and upper level low/trough. An upper level high pressure builds along the coast to allow for a thermal trough to develop. This will bring in a much drier airmass on Monday, dropping afternoon humidities into the low to mid-teens across Central Oregon - extending across the Columbia Basin by Tuesday. Diurnally breezy winds will result each day over the critically dry airmass, which may warrant the issuance of fire weather products over certain areas. 75 && .AVIATION /18Z TAFS THROUGH 18Z SATURDAY/... VFR conditions continue through the period with gusty winds developing Saturday morning/afternoon. Forecasting winds to gust 25 to 35 knots for DLS/PDT/ALW/PSC. Small chance (5 to 15 percent) of temporary MVFR conditions developing due to lingering smoke and haze. && .FIRE WEATHER... RED FLAG WARNINGS have been issued for 11 AM to 11 PM Saturday for fire weather zones WA690-694 and OR 691-704. A Particularly Dangerous Situation (PDS) Red Flag has been issued for WA690-WA693, OR691-OR696, and OR700 between 2 PM and 8 PM. These zones included in the PDS could experience extreme fire weather resulting in rapid fire growth for new and existing fires. The ECMWF suggests 700mb winds of up to 50kts in the Basin with 40-45kts through Central Oregon. These elevated winds are moving into an airmass with precipitable water amounts of 0.4-0.6",60-80% of normal, which should allow for these winds to be more efficient at mixing to lower elevations. Guidance has also struggled with this unseasonal weather pattern, as observations highlight a higher bias related to model data. Thus, a trend toward drier and windier conditions is possible over the next 12 hours. 75 && .Preliminary Point Temps/PoPs... PDT 62 84 47 78 / 0 0 0 0 ALW 67 87 52 79 / 0 0 0 0 PSC 64 91 51 83 / 0 0 0 0 YKM 62 87 51 82 / 0 0 0 0 HRI 66 86 52 81 / 0 0 0 0 ELN 60 78 49 75 / 0 0 0 0 RDM 52 84 40 79 / 0 0 0 0 LGD 60 88 48 79 / 0 0 0 0 GCD 57 92 49 82 / 0 0 0 0 DLS 64 80 56 80 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... WA...Red Flag Warning from 11 AM to 11 PM PDT Saturday for WAZ690>693. Air Quality Alert until 2 PM PDT Monday for WAZ028>030. Wind Advisory from 11 AM to 11 PM PDT Saturday for WAZ026. OR...Red Flag Warning from 11 AM to 11 PM PDT Saturday for ORZ691>704. Air Quality Alert until 2 PM PDT Monday for ORZ044-049-050-502- 503-505>511. && $$ DISCUSSION...75 AVIATION...95 FIRE WEATHER...77

777 FXUS65 KREV 312030 AFDREV Area Forecast Discussion National Weather Service Reno NV 130 PM PDT Fri Jul 31 2026 .KEY MESSAGES... * Hot and dry conditions prevail through next week, with triple digit heat in lower valleys for most days. * Areas of haze and smoke from current active fires could reduce air quality at times in parts of far northwest and west central NV, with patchy smoke also near and east of the Elephant Fire. * Typical afternoon winds are expected each day, producing short periods of elevated fire weather concerns in isolated areas. && .DISCUSSION... The first day of more widespread triple digit heat in lower elevations arrives this afternoon and peaks Saturday. Heat Advisories continue for portions of west central NV especially along parts of US-95 and US-50 where low temperatures aren`t as cool (upper 60s-lower 70s). While far western NV isn`t quite at heat advisory levels due to cooler overnight lows in the mid 50s-lower 60s, Reno`s current record highs of 103 for today and Saturday are within reach. For Sierra communities, highs around 90 degrees prevail through the upcoming week. Temperatures in lower elevations ease back a bit Sunday and dip below 100 degrees in most valleys as the high pressure ridge near the Four Corners region edges southward. However, triple digit heat is poised to return for the remainder of next week from Tuesday onward, with latest blended guidance indicating highs similar to Saturday`s levels for at least one day next week. The battleground between potential shortwave trough passages across the Pacific NW and the northward expansion of the southwest US ridge continues to fluctuate with daily guidance, so next week`s temperature range still spans a few degrees above or below the current forecast. This isn`t our first period of 100 degree temperatures this summer but heat safety remains just as important: stay hydrated, wear lightweight and light-colored clothing, and if outdoors take frequent breaks in the shade or air conditioning. Also remember to look before you lock your vehicles, making sure not to leave children or pets behind. Afternoon SW-W breezes continue near typical zephyr-type levels for most days through next week, with gusts mainly near 25 mph and isolated short-duration gusts to 30 mph near and north of I-80. When combined with continued low afternoon humidity and poor overnight recovery especially for western NV midslopes and thermal belts, expect elevated fire weather concerns during these afternoon breezy periods. Given the wind pattern and current fire activity, areas affected by smoke and haze at times through Saturday include far eastern Churchill County (from the New Pass Fire), far northwest NV/Surprise Valley (from fires in Oregon), and the valleys north of Reno-Sparks (from the Elephant Fire). Weather wise, dry conditions with minimal cloud cover continue for the upcoming week. Afternoon cumulus buildups are projected to return mainly south of US-50 by mid-late next week, but warm air aloft and absence of sufficient forcing are likely to limit vertical growth. Longer range outlooks hint at increasing monsoonal moisture into the Great Basin near or after August 10, but western NV appears to be on the fringe or just outside of the moisture surge at this time. These outlooks also project a gradual weakening of the ridge with lower chances of triple digit heat persisting through the second week of August. MJD && .AVIATION... * VFR conditions continue for all terminals through at least early next week, with daily afternoon SW-W wind gusts 20-25 kts mainly between 21z-04z. With temperatures peaking each afternoon through Saturday, density altitude concerns increase for the western NV terminals. MJD && .REV Watches/Warnings/Advisories... NV...Heat Advisory until 8 AM PDT Sunday NVZ001-004. CA...None. && $$

868 FXUS66 KSTO 311907 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1207 PM PDT Fri Jul 31 2026 For additional details on weather and expected impacts over the next 7 days, please visit weather.gov/sto/briefing. .KEY MESSAGES... - Elevated Fire Weather Conditions in the northern Sacramento Valley and surrounding terrain, Burney Basin, and Sierra Foothills through Monday due to hot temperatures, low humidities, and breezy winds. - Widespread Moderate HeatRisk today into next week across the Valley and Foothills. Hottest temperatures expected Saturday- Monday. && .DISCUSSION... Today-Monday... Latest GOES-West water vapor imagery depicts ridging beginning to build into interior NorCal early this afternoon as troughing digs offshore of the Pac NW. Little forecast change is anticipated as the ridge axis centers over the Great Basin/Desert Southwest while the offshore trough tracks onshore. Resultant high temperatures today are expected to trend above normal today with widespread triple digit high temperatures and more limited overnight cooling then anticipated Saturday-Monday. Current probabilities for high temperatures greater than 100F sit around 60-90% for the Delta, Valley, and lower foothills. Additionally, 50-80% probabilities of high temperatures greater than 105F are forecast for the northern Sacramento Valley. As a result, moderate HeatRisk is expected prevail area wide. As the aforementioned offshore trough tracks eastward through the weekend, periods of breezy north to west winds are expected to develop at times across the northern Sacramento Valley and surrounding terrain, Burney Basin, and northeast Sierra foothills. The periods of stronger winds are anticipated late Saturday afternoon into midday Sunday and again Sunday evening into midday Monday, with strongest winds gusting 20-30 mph currently forecast for Monday morning. The combination of low daytime humidity values into the lower teens and upper single digits, limited overnight humidity recovery, and periodically breezy to gusty winds will introduce elevated fire weather conditions to the above areas through Monday. Tuesday through next week... As the passing longwave trough flattens the ridge and introduces broader reinforcing onshore flow to interior NorCal early to mid next week, a slight cool down is anticipated, although widespread Moderate HeatRisk is still expected to persist. While high temperatures into the upper 90s to triple digits are likely to continue across much of the region, increasing onshore flow and the return of a more persistent Delta Breeze pattern is expected to provide some overnight relief for Delta and vicinity Valley locations. && .AVIATION... VFR conditions are expected to prevail over the next 24 hours. Winds generally remain 12 kts or less at TAF sites, although some gusts nearing 18 kts will be possible through 06z Saturday. Stronger sustained winds up to 15 kts with gusts up to 22 kts are otherwise expected through the Delta, gradually weakening after 12z Saturday. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$

679 FXUS65 KMSO 312035 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 235 PM MDT Fri Jul 31 2026 .DISCUSSION... Key Messages: * Critical Fire Weather Conditions across Northern Rockies, Saturday afternoon through Saturday night. * Choppy wave activity on area lakes for Saturday afternoon and evening. * Relatively cool airmass in place Sunday through early next week, but summer warmth returns thereafter. The warm ridge of high pressure currently over the Northern Rockies will provide a few more days of hot afternoon temperatures. Anticipate most low elevations warming into the 90s and 100s (F). Despite these temperatures being in line with recent trends, remember to take take frequent breaks, drink plenty of water, seek shade, and never leaving any person or pet in a parked vehicle. There is a 70 percent probability of showers and thunderstorms developing across Lemhi County Idaho and portions of southwest Montana this evening. The ridge of high pressure is anticipated to break down Saturday through Sunday, resulting in gusty winds and low relative humidity across the Northern Rockies. Red Flag conditions will develop at many locations. Those recreating on area lakes, particularly Flathead Lake, will experience choppy wave activity Saturday afternoon through late evening. A cold front is expected to sweep across the Northern Rockies Saturday evening. A relatively cool airmass is projected to rush over the Northern Rockies Saturday night through Sunday. Gusty winds will return during daytime Sunday and once again increase wave activity on area lakes. However, the cooler daytime temperatures should keep afternoon humidity a bit higher compared to Saturday. Prepare for very efficient radiational cooling across the Northern Rockies overnight Sunday. High mountain valleys will cool to the 30s in many locations by Monday morning. Long range ensembles generally agree that a warm high pressure ridge will return to the Northern Rockies around the middle of next week. Models also tend to agree that the next iteration of our summertime ridge will be several degrees cooler than the current ridge. && .AVIATION... High density altitude will continue due to heat through Saturday. Smoke from area wildfires and increasing west winds aloft will be the main aviation weather impacts over the Northern Rockies for the next 24 hours. Also, there is a 70 percent probability that showers and thunderstorms will develop 31/2100Z through 01/0400Z roughly between KSMN and KBTM. Anticipate erratic wind gusts to 40 knots near any thunderstorm that develops. Terrain will be occasionally obscured during this time as well. A surface cold front will increase wind gusts to 30 knots beginning around 01/2000Z. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...Red Flag Warning from 2 PM Saturday to 9 PM MDT Sunday for Deerlodge/West Beaverhead...East Beaverhead. Red Flag Warning from 2 PM Saturday to midnight MDT Saturday night for Bitterroot...East Lolo...Flathead Reservation... Flathead/Glacier Park...Kootenai...West Lolo. ID...Red Flag Warning from 11 AM to 8 PM PDT Saturday for Palouse/Hells Canyon. Fire Weather Watch from Saturday morning through Saturday evening for Palouse/Hells Canyon. && $$

227 FXUS65 KBOI 312043 AFDBOI Area Forecast Discussion National Weather Service Boise ID 243 PM MDT Fri Jul 31 2026 .KEY MESSAGES... - Hot with widespread wildfire smoke persisting across southeast Oregon and much of southwest Idaho through Saturday. - Dry cold front Saturday evening will bring period of critical fire weather conditions and gusty winds. - Remaining dry but not as hot Sunday through Tuesday. The heat returns by midweek. && .SHORT TERM /Through Sunday Night/... An upper high over the Desert SW will keep the heat on through Saturday. Temperatures will again touch 100 degrees at lower elevations with locally hotter temperatures (Mountain Home to Hagerman) pushing above 100 degrees on Saturday. Flow aloft will increase on Saturday as an upper trough pushes into the Pac NW. Higher, open terrain in SE Oregon and SW Idaho will tap into the southwest winds, bringing gusts to 30 mph by afternoon. The upper trough and accompanying cold front advance inland Saturday evening pushing a dry cold front into SE Oregon by late afternoon, advancing into SW Idaho during the evening. Winds gusts will be strongest across SE Oregon, especially along the I-84 corridor between Baker City and Ontario where gusts to 45 mph are expected into Saturday night. For Baker County have opted to cover the wind threat with an Advisory picking up where the Red Flag Warning leaves off as relative humidity will be on in the increase, but but gusty winds will continue into Saturday night. Elsewhere wind gusts top out between 25 and 40 mph across SE Oregon and the Snake Plain/Highlands of SW Idaho through Saturday night. For Sunday the post frontal air mass is dry with high temperatures 10-15 degrees cooler than Saturday. It will remain breezy as westerly winds reside through the mixed layer. This will result in elevated, but not quite critical fire weather conditions as afternoon relative humidity drops to around 10% across lower elevations. Forecast models are cutting down on smoke coverage for Sunday as westerly flow in a well mixed environment vents out the smoke that has pooled up over the last week(ish) and modeled plumes from ongoing fires are tighter. Do expect some improvement going into early next week, but uncertain on how much, especially if there are new starts or Saturday`s wind/RH event kicks up current activity. Sunday night will be cool compared to the recent past with temperatures dropping below 60 across the Snake Plain. Officially for Boise this would be the first sub-60 degree temperature since July 3rd. && .LONG TERM /Monday through Friday/... After the aforementioned cool start, lower elevations will see another dry, sub-90 degree day on Monday. Winds will pick up across SE Oregon and the Snake Plain of Idaho as westerly flow aloft mixes to the surface. The upper trough providing the cooler, breezy conditions will slide east of the area Tuesday, allowing for warm temperatures to return. By Wednesday highs are back into the mid-upper 90s across lower elevations (smoke coverage/density dependent). There is no chance for precipitation next week as monsoon moisture remains bottled up over the Four Corners. The hot and dry conditions will be favorable for fire growth so smoke is likely to increase in coverage and density. && .AVIATION /18Z Friday through Saturday/... Issued 1219 PM MDT FRI JUL 31 2026 Wildfire smoke will continue to reduce visibility across the region through Saturday. Mostly MVFR to lower VFR conditions, with local IFR across SE Oregon and along the OR/ID border. Hot conditions will produce high density altitude through Saturday afternoon. Surface winds: variable under 12 kts. Winds aloft at 10kft MSL: S 5-15 kt. KBOI...Low VFR visibility in smoke. Light surface winds through tonight. Weekend Outlook...Wildfire smoke will keep widespread visibility reduction in place through Saturday, mostly across SE Oregon. Coverage is expected to decrease and visibility will improve on Sunday. High density altitude due to hot conditions on Saturday. Gusty SW-NW surface winds 25 to 40 kt Saturday night decreasing to 15-20 kt Sunday. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...Air Quality Alert until 2 PM MDT Monday for IDZ011-012-014-015- 029-033. Red Flag Warning from 3 PM to 9 PM MDT Saturday for IDZ400-402- 423. OR...Red Flag Warning from 3 PM MDT /2 PM PDT/ to 9 PM MDT /8 PM PDT/ Saturday for ORZ670>675. Air Quality Alert until 3 PM MDT /2 PM PDT/ Monday for ORZ061>064. Wind Advisory from 8 PM Saturday to 2 AM PDT Sunday for ORZ062. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise SHORT TERM...DG LONG TERM....DG AVIATION.....DG

504 FXUS65 KLKN 311856 AFDLKN Area Forecast Discussion National Weather Service Elko NV 1156 AM PDT Fri Jul 31 2026 .KEY MESSAGES... * Near record heat in most of northern and central Nevada each afternoon through Sunday. * Moderate risk of heat-related illnesses for heat-sensitive groups each afternoon through Sunday. * Above normal temperatures will persist into at least the middle of next week. * Smoke from area wildfires to lead to reduced air quality and may lead to respiratory issues over northern Nevada today. && .DISCUSSION... (This afternoon through next Friday) WEATHER PATTERN OVERVIEW: Little change in the forecast through the weekend and into next week as high pressure remains dominant across the Desert Southwest, which keeps monsoonal moisture shunted south of much of the Great Basin. A shortwave trough moves across the Pacific Northwest and into the Northern Plains Sunday into Monday, leading to stronger afternoon wind gusts across northern Nevada with gusts from 25 to 30 mph Saturday and Sunday afternoons. With minimum afternoon relative humidity values in the single digits, elevated to localized critical fire weather condtions will develop across areas north of I-80 Saturday, Sunday, and Monday afternoons. The other story will be the continued heat across northern and central Nevada with moderate to major HeatRisk values for max afternoon heat indices in the mid to upper 90s, especially in valleys. Saturday will feature the hottest high temperatures in the upper 90s to low 100s across most of the Great Basin. This will not only lead to heat-related illness concerns for the elderly and those susceptible to the heat, but to anyone who spends time outdoors, especially in the sun. Consider postponing outdoor activities until the morning or late evening. Drink plenty of fluids, wear loose-fitting clothing, and take frequent breaks if you must be outdoors. Heat Advisories are likely to continue for portions of the area into early next week, though a slight reprieve arrives on Sunday across northern Nevada as a weak "cold" front drops south out of Oregon and Idaho with the aforementioned shortwave trough that moves across the Pacific Northwest into the northern Rockies. Moisture will be limited with this so no thunderstorm activity is expected. Here are the probabilities for highs to top the century mark on Saturday: Battle Mountain - 90% Carlin - 85% Elko - 85% Winnemucca - 85% West Wendover - 85% Wells - 90% Spring Creek - 75% Tonopah - 65% Eureka - 70% Ely - 35% FORECAST CONFIDENCE & DEVIATIONS: High confidence in hot and dry weather continuing through the weekend and into the early part of next week. High forecast confidence regarding a moderate risk of heat-related illnesses for heat-sensitive groups each afternoon through Sunday. High forecast confidence in above normal temperatures persisting into at least the middle of next week. Medium confidence in elevated to near-critical fire weather conditions across northern Nevada during the afternoon periods Saturday through Monday with timing of strongest wind gusts coinciding with minimum RH values remaining more uncertain. && .AVIATION... Breezy southwest winds at most terminals today from 5 to 10 kt with occasional gusts up to 18 kt. Hazy skies with area wildfire smoke lingering. Winds light and variable tonight. No precipitation is expected through the TAF period. && .FIRE WEATHER... Mostly sunny and storm-free through the weekend with hot and dry conditions persisting. High temperatures in the upper 90s to low 100s across all fire zones. West-northwest winds increase Saturday afternoon across zone 437 and the northern portions of zones 438, 469, and 470 with low RH below 10 percent for elevated to near- critical fire weather conditions. Winds increase into Sunday afternoon and evening as a weak cold front drops southward from Idaho. North-northwesterly winds gusting from 25 to 30 mph, with confidence greatest for 30 mph wind gusts across northern zone 470 (90% chance). This combined with low RH below 10 percent will lead to continued elevated fire weather conditions. Similar conditions look to persist across zones 438, 469, and 470 with breezy afternoon winds for elevated fire weather conditions. RH recoveries mostly in the 20s across central Nevada and 30s across aforementioned northern Nevada fire zones. && .LKN Watches/Warnings/Advisories... Heat Advisory until 9 PM PDT this evening NVZ031-033-035>039. Heat Advisory from 10 AM to 10 PM PDT Saturday NVZ031-033>041. && $$ DISCUSSION...84 AVIATION...84 FIRE WEATHER...84