711 FXUS66 KSEW 132215 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 315 PM PDT Fri Mar 13 2026 .SYNOPSIS... A stationary front over the Columbia River will begin to move out of the region this weekend. Widespread precipitation will decrease in coverage into Saturday, with a convergence zone continuing to affect portions of the Cascades and adjacent foothills. Warmer temperatures are on the way next week, although the pattern will continue to remain unsettled with additional systems passing through with more widespread rain. && .SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/... The synoptic pattern remains relatively intact, with a stationary front along the Columbia River, and a strong zonal upper level jet over the state expanding over the northern CONUS. A shallow shortwave trough will pass through Saturday afternoon, with a ridge beginning to build over the Pacific late this weekend. Precipitation: Widespread stratiform showers continue on radar this afternoon. The precipitation has transitioned from snow to rain in spots as temperatures struggle to climb into the upper 30s this afternoon (many spots will likely remain in the mid 30s). The ensembles have the stratiform precipitation diminishing from north to south this evening. A convergence zone is expected to setup across the foothills/west slopes of the Cascades tonight into the first part of Saturday. The overall moisture output from this convergence zone will be significantly less than the precipitation past 24 hours. The temperatures tonight however will be a couple degrees cooler in spots, with lows right around freezing (areas closest to water will see lows in the mid 30s, and mountain areas with fresh snow will see lows in the teens). For impacts: the heavy snow threat has ended for the Olympics this afternoon, and the winter storm warning was subsequently cancelled. Snow showers will continue, but are not expected to produce any significant impacts. For the Cascades, heavy snow is expected to continue on the west slopes through tonight. Travel continues to remain dangerous in the passes with several roadways experiencing closures at times today. The winter storm warning will continue into Saturday morning, with travelers encouraged to check road conditions on WSDOT before traveling. Hi-res ensemble guidance was keeping a medium to high chance of central Cascade foothill and valley locations receiving an additional 1-2 inches of snow through Saturday morning with the convergence zone. Given the lower snow levels in this area, and the impacts from this morning`s snow, the winter weather advisory was extended through 11 AM for the King/Pierce County areas, and expanded to include a portion of the foothills extending into southern Snohomish County. Snow in these areas will be dependent on the location that the convergence zone sets up. Remaining lowland areas have a low probability of seeing any accumulating snow (let alone a trace), but may still see snowflakes come down tonight for any shower that moves through. The precipitation will wrap up Saturday evening, with a break in any moisture for the majority of the day until Sunday evening (a 30% chance of snow showers will continue in the mountains). Temperatures will warm considerably from Friday into Saturday and Sunday, with highs returning into the mid 40s. Lows will still remain around freezing for most through the weekend. Winds will vary at times between the south and north, but generally remain around 5 to 10 mph. && .LONG TERM /MONDAY THROUGH FRIDAY/... There are strong signals that the following week will continue to remain active, as ensembles continue to point to a warmer and wet pattern continuing into next week. Weak atmospheric river conditions are expected to continue as the jet stream remains on the west coast, but shifts north into northern WA/southern B.C. next week. The main concern will be potential hydro impacts from higher snow levels from the warm air moving in, and some snow melt from recent snows. See the hydrology section below for additional details on river flooding. The precipitation is primarily focused in the mountains, and the coast. Temperatures will climb through the week, with highs approaching upper 50s to 60 towards Wednesday through Friday. HPR && .AVIATION... Stalled frontal band still giving a narrow ribbon of light snow across western WA, primarily over southern King and into Pierce counties. The trend is to still transition to a rain/snow mix then all rain moving through the rest of the afternoon and evening as the band shifts south and exits. Showers will then reform over the central sound overnight with a weak convergence zone. Light rain or a rain/snow mix possible near the sound with snow heading east toward the Cascades. Showers will taper off by 14-18Z as high pressure moves in. LIFR to IFR in the central sound with the snow and convergence zone, with primarily MVFR otherwise. KSEA...Snow changing to a mix or light rain by 00Z. Models favor light rain with convergence zone overnight with higher snow levels. Surface temps remaining above freezing. Winds light and variable, switching to S to 10 kt by 09-12z. IFR improving to MVFR 15z and VFR after 18z. 33 && .MARINE... A stalled front near the Oregon border this afternoon will shift southeastward tonight and Saturday as a surface ridge builds into the coastal and offshore waters. This will lead to increasing onshore flow over the coastal waters and in the Strait of Juan de Fuca tonight into Saturday. The ridge will shift onshore Saturday night and Sunday as a strong warm front approaches the offshore waters. The warm front will lift northward across area waters Monday into Tuesday for increasing winds and seas. 27 && .HYDROLOGY... Flood Watches remain in effect for SW Washington including Grays Harbor, Thurston and Lewis counties due to potential flooding. Both the Newaukum River near Chehalis and the Skookumchuck River near Bucoda have reached flood stage, with the Chehalis at Grand Mound following early Saturday. Rivers will crest this weekend. An atmospheric river is expected to move inland to the north early next week. This could bring additional flooding concerns to portions of the area as several rivers are forecast to reach Action Stage. For now, the only river forecast to reach flood stage is the Skokomish River. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...Winter Storm Warning until 5 AM PDT Saturday for Cascades of Pierce and Lewis Counties-Cascades of Snohomish and Northern King Counties-Cascades of Southern King County- Cascades of Whatcom and Skagit Counties. Flood Watch through Sunday afternoon for Cascades of Pierce and Lewis Counties-Foothills and Valleys of Thurston and Lewis Counties-Foothills of the Western and Southern Olympic Peninsula-Grays Harbor County Coast-Lower Chehalis River Valley-Lowlands of Lewis and Southern Thurston Counties-Middle Chehalis River Valley-Olympia and Southern Puget Sound-Olympics-Willapa and Black Hills. Winter Weather Advisory until 11 AM PDT Saturday for Foothills and Valleys of Snohomish and Northern King Counties. Winter Weather Advisory until 11 AM PDT Saturday for Foothills and Valleys of Central King County-Foothills and Valleys of Pierce and Southern King Counties. PZ...Small Craft Advisory from 11 PM this evening to 11 PM PDT Saturday for Central U.S. Waters Strait Of Juan De Fuca- Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm-West Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from 11 PM this evening to 3 PM PDT Saturday for East Entrance U.S. Waters Strait Of Juan De Fuca. && $$

213 FXUS66 KPQR 132230 AFDPQR Area Forecast Discussion National Weather Service Portland OR 330 PM PDT Fri Mar 13 2026 .SYNOPSIS...The region is slated to get one last burst of moderate to locally heavy precipitation tonight into early Saturday morning as the Atmospheric River which has sat over the Pacific Northwest the past few days makes a final push southward. While the probability for mainstem river flooding is low, we continue to monitor our more flood prone/flashier rivers and an areal flood watch remains in effect through Saturday. After a bit of a lull the later half of Friday into Saturday the region remains on the northern periphery of a strong upper- level ridge for much of next week allowing for above normal temperatures although rainfall chances likely persist at times. && .SHORT TERM...Now through Sunday Night...So far this afternoon the bulk of the rainfall has been hung up over far NW Oregon and SW Washington just north of the Portland/Vancouver Metro as the an Atmospheric river coupled with a cold-frontal boundary begins its slow and final journey southward. Helping to drive this progression is a the arrival of a shortwave trough from over the eastern Pacific which is expected to arrive overnight. High confidence among model guidance this`ll further accelerate the front and rainfall through and then our of the region. Exploring high resolution guidance like the HREF shows moderate probabilities (40-50%) for a period of elevated rainfall rates greater than 0.25in/hr this evening into the overnight hours across the coast range and western slopes of the Cascades as the atmospheric river and strong cold front swing through the area. While it`s within the realm of possibility to see these higher rates over the valleys and I-5 corridor along the immediate frontal boundary, there are much better chances (50-80%) for rates closer to 0.10in/hr, especially around and east of I-5. From 5pm this afternoon to 5am Saturday moderate to high confidence the Portland metro will see between 0.70-1.25 inches of rain, 0.60-1.10 inches in Salem, and 0.40-0.75 inches in Eugene. Obviously higher amounts are expected over the coast range (generally 1-2 inches) and Cascades (1-3 inches). This`ll come into play when looking at the flooding treat, especially for urban, low-lying or other poor drainage areas and flashier small creeks/rivers as they remain highly sensitive to additional rainfall - see the Hydrology section for additional details regarding flooding concerns. Headed through Saturday morning conditions rapidly improve as almost all deterministic and ensemble guidance show the last remnants of the atmospheric river exiting Lane County by 0700-1000. The remainder of the day appears mostly dry outside of some lingering shower activity primarily confined to terrain features like the Coast Range, Cascades, and adjacent foothills. Our attention turns to a ridge of high pressure attempting to establish itself over western CONUS Saturday night through Sunday into early next week. While this feature and a switch to broad southwesterly flow aloft is likely robust enough to raise our temperatures well above normal for early next week, it won`t be strong enough to prevent the southern periphery of another atmospheric river headed into British Columbia from facilitating chances for light rain across far north Oregon and southwestern Washington starting Sunday afternoon into Sunday night. The overall pattern sees little progression from this point through the end of the long term period. -99 .LONG TERM...Monday through Thursday...Looking into the start of next week, ensemble models show yet another Atmospheric River aimed at the Pacific Northwest and British Columbia however most ensembles maintain a northerly trajectory with a focus towards the Vancouver Island and northwest Washington. That said, the latest guidance has shifted precipitation just a touch further south than what has been shown prior forecast cycles but it won`t be enough to be impactful at this point. What dictates the placement of the axis of moisture next week will be the ridge amplitude to our south that is expected to slowly push eastward with time. IF the ridge weakens, then that would result in our area getting more precipitation than forecast. The ridge and southwesterly flow also push 850 mb temperatures to around 10 to 12 degrees C, which would lead to daytime highs into the 60s to near 70 for inland locations, 50-60s along the coast, Coast Range and Cascades through the middle of next week. With temperatures this high snowmelt in the Cascades is probable. Looking at the latter part of Wednesday and towards the end of next week, another round of precipitation appears to be on deck. So, Spring 2026 looks to be in full swing for the Pacific NW. -99/42 && .AVIATION...Conditions continue to vary over the airspace as an atmospheric river continues to impact the region. The atmospheric river begins to shift south again, bringing a return of heavier rain to the airspace north of KTMK and KUAO as of 22Z Fri. The atmospheric river will continue to push south through most of the TAF period, with the system expected to fully exit the airspace to the south by 12-18Z Sat. For the coastal terminals, expect IFR/LIFR conditions to prevail until around 11-13Z Sat, then potentially improve to VFR. For inland terminals, expect conditions to vary between VFR and MVFR until 12-14Z Sat, then potentially improve to VFR. As for the winds, south/southwesterly winds around 10-15 kt with gusts up to 25 kt at inland terminals and 15-20 kt with gusts up to 30 kt at coastal terminals will persist until 09-15Z Sat, then weaken and shift more westerly. KPDX AND APPROACHES...An atmospheric river begins to shift south through the airspace, maintaining MVFR and occasional VFR conditions until 12-14Z Sat. Thereafter, rain will come to an end and conditions will improve to VFR for the rest of the TAF period. Current southwesterly winds of 10-15 kt with gusts up to 25 kt will weaken and become more westerly around 09Z Sat. ~12 && .MARINE...Seas and southerly winds will remain elevated through late Saturday, therefore the Small Craft Advisory for all waters will be maintained until 11 PM Saturday. Winds will become northerly late tonight and through Saturday. Seas around 9 to 10 ft today will slowly ease below 9 feet by early Saturday. Beyond Saturday, conditions will remain rather benign until the start of next week. A quick moving system could result in seas briefly returning to 10 to 11 ft on Tuesday for all waters. At the moment, there is a 50-60% chance for seas to exceed 10 ft on Tuesday for the outer waters (beyond 10 NM) north of Cape Falcon OR and a 30-50% for the outer waters between Cape Falcon and Cape Foulweather OR. ~12 && .HYDROLOGY...Moderate rainfall associated with an atmospheric river across southwest Washington and far northwest Oregon is beginning to shift back south this afternoon and will continue to slowly move south tonight. Rain is expected to end for most locations by Saturday morning, except for some lingering precipitation across the central Oregon Cascades. With increasing rainfall rates, rivers are expected to rapidly rise, especially the flashier rivers that are already swollen near or at action stage. These include Johnson Creek near Sycamore, the Grays River near Rosburg, the Cowlitz River near Kelso, and the Wilson River near Tillamook, which are all currently in or forecast to go into Minor Flood stage. Another 6-8 rivers are forecasted to go into action stage. As the next round of moderate rainfall moves through, minor flooding of urban, low-lying or other poor drainage areas remain possible Small creeks and streams remain highly sensitive to this additional rainfall. The Flood Watch remains in effect through Saturday afternoon, but may be able to be dropped as soon as the front pushes through early Saturday morning. Continue to monitor the latest river forecasts at water.noaa.gov as updates to forecast rainfall may dramatically affect forecast river levels. The majority of flood deaths occur in cars, and drivers should never attempt to cross a flooded roadway. Please heed any road closures posted by local authorities. && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...Small Craft Advisory from 2 AM to 11 PM PDT Saturday for PZZ210. Small Craft Advisory until 11 PM PDT Saturday for PZZ251>253- 271>273. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

406 FXUS66 KMFR 132126 CCA AFDMFR Area Forecast Discussion...CORRECTED National Weather Service Medford OR 226 PM PDT Fri Mar 13 2026 ...Corrected Marine Section... .DISCUSSION...Daytime highs across areas west of the Cascades should be slightly cooler today than they were on Thursday as an upper ridge over the Pacific Ocean flattens slightly and decreases atmospheric pressure. Westerly zonal flow will keep bringing moisture for light showers to Coos and northwestern Douglas counties, but little other inland activity is expected through the day today. A shortwave trough passing to the north will bring some coastal showers this evening, with inland showers expected through Saturday morning. Amounts have trended upward slightly but remain unimpactful. Coastal areas could see up to an inch of rainfall while coastal ranges could approach an inch and a half. Snow levels look to be at 6500-7000 feet, keeping snowfall to Cascades peaks and ridgelines. In these areas, 1 to 3 inches of snowfall is possible. Western Cascades foothills could see about half an inch of rainfall, with minimal rainfall to the east. Precipitation trails off by Saturday afternoon. This trough will also bring gusty winds along and east of the Cascades through most of Saturday. For Lake County and especially along Winter Rim, these gusts could reach 45 to 50 mph. A Wind Advisory for this evening into Saturday morning remain in place to more fully communicate these expected hazardous conditions. Beyond the Saturday shortwave, the Pacific ridge looks to strengthen and establish a stable pattern through most if not all of the week ahead. This will bring a warning trend starting on Sunday. Forecast daytime highs remain 10 to 20 degrees above seasonal averages across the area by the middle of next week. Broadly speaking, coastal areas will see daytime highs in the mid to high 60s while west side valleys will be in the mid to high 70s. Low elevation areas in Lake and Klamath counties may stay in the low to mid 70s, while parts of Siskiyou and Modoc counties may see a few extra degrees of warming. Per NBM probabilistic guidance, Alturas has a 50-65% to see daytime highs above 80 degrees from Tuesday into Saturday while Medford and Montague have a 15-20% chance and only towards the end of the week. These warm conditions do bring Minor HeatRisk levels to the area through most of next week. Minor levels do not support an Advisory product, but individuals who are extremely sensitive to warm conditions may be at risk of heat-related illnesses next week. Cooler temperatures are possible for next weekend, although there is some uncertainty in the timing and amount of cooling. To illustrate this, let`s consider the interquartile range for Roseburg;s daytime highs. An example of a "usual" short-term interquartile range (the range between the 25th percentile and 75th percentile outcomes) for a high temperature might be 3 to 6 degrees. At Roseburg for this Saturday, that range is 3 degrees; we`d expect a high between 46 and 49 degrees. For Saturday the 21st, that range is 23 degrees; we`d expect a temperature between 56 and 79 degrees. This happens when long-term models see a wide range of outcomes. Of course, this range should decrease as the pattern for next weekend comes into focus. -TAD && .AVIATION (12Z TAFs)... A stalled front to the north will eventually push through the area tonight bringing widespread shower activity impacting all the terminals west of the Cascades. KLMT may only see vicinity activity. While conditions this afternoon may present VFR ceilings, there is high confidence MVFR conditions will be common throughout most of the valid TAF cycle with periods of IFR overnight as low levels saturate. && .MARINE...Updated 100 PM PDT Friday, March 13, 2026...Breezy southerly winds are expected today and early tonight resulting in steep seas for areas north of Cape Blanco. A stalled front to the north will move through from north to south tonight with a wind shift to northerly for all areas by Saturday morning. Conditions will become hazardous to small craft for all areas by Saturday morning and continue into Sunday morning. && .MFR WATCHES/WARNINGS/ADVISORIES... OR...Wind Advisory from 11 AM to 8 PM PDT Saturday for ORZ031. CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory from 5 AM Saturday to 2 AM PDT Sunday for PZZ356-376. Small Craft Advisory until 2 AM PDT Sunday for PZZ350-370. && $$

197 FXUS66 KEKA 132102 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 202 PM PDT Fri Mar 13 2026 .SYNOPSIS...Coastal drizzle is possible tonight and into Saturday for Humboldt, with some light rainfall over Del Norte. More significant warming will begin late this weekend and next week. && .DISCUSSION...A front is approaching Northwest California. This boundary is expected to weaken and drift towards Del Norte County overnight tonight and into Saturday. This will increase cloud cover over the region and perhaps bring light rain to Del Norte County and light rain/drizzle to northern Humboldt County. Precipitation will move into the region very late tonight and persist into late Saturday morning/early afternoon. Currently, looking at NBM 24 hour probabilities of over 0.1 inches accumulation (5pm Friday 3/13 to 5pm Saturday 3/14): Del Norte County has about an 85 to 95 percent chance; northern Humboldt County has about a 50 to 70 percent chance with higher chances along the coast from about Cape Mendocino and north. More recent NBM runs even have about a 25 to 45 percent chance for 0.5 inches or more for Del Norte County in 24 hours over the same time period (5pm Friday 3/13 to 5pm Saturday 3/14). Generally, a dominant ridge of high pressure will build over the region this weekend and into next week. There is high confidence the ridge will begin to greatly amplify through the end of the weekend. Near record high temperatures will be possible with some of the warmest valleys in Mendocino and southern Lake possibly approaching 90 degrees by early next week. As of now, the warmest days will most likely be Monday and Tuesday. These temperatures will bring some Minor level HeatRisk, with perhaps very localized Moderate levels for far southern Lake County. Most interior valleys could see temperatures in the 80s, while coastal areas could see high temperatures in the mid/high 60s to low 70s through that period. && .AVIATION...(18Z TAFs)...VFR conditions are being observed at all terminals and low clouds in the river valleys have lifted and scattered. Low ceilings are likely to develop this evening and overnight, with drizzle and/or light rain possible around ACV and CEC. LIFR to IFR ceilings and visibilities are possible. This front moves out of the area around sunrise Saturday and ceilings are likely to lift and scatter. Some interior valleys could see stratus again overnight, but UKI is likely to remain VFR. JB && .MARINE...Northerly winds remain breezy around and south of Cape Mendocino, with sustained winds of 20 to 30 kts possible this afternoon. Steep wind waves of 4 to 6 feet will be associated with these winds. Outside of this area, winds remain mild with generally west to northwest winds. Seas are dominated by a mid period northwest swell at around 5 to 7 ft and a small long period southerly swell. Winds diminish overnight and turn south- southwesterly north of the Cape as a weak front moves through the area. North winds sharply increase late Saturday morning and afternoon behind this front, bringing near-gale force gusts to the northern waters and widespread 20 to 25 kt sustained winds. Steep wind waves of 5 to 8 ft will be associated with these winds. Winds ease north of Cape Mendocino Sunday, but remain breezy around and south of Cape Mendocino into early next week. Winds ease mid to late next week. JB && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 3 PM Saturday to 4 AM PDT Sunday for PZZ450. Small Craft Advisory until 4 AM PDT Sunday for PZZ455. Small Craft Advisory from 11 AM Saturday to 11 AM PDT Sunday for PZZ470. Small Craft Advisory until 5 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

064 FXUS66 KMTR 132351 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 451 PM PDT Fri Mar 13 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 244 PM PDT Fri Mar 13 2026 - Above normal temperatures and Minor HeatRisk continue through Saturday - A long duration, early season heatwave begins Sunday with record breaking temperatures and Moderate HeatRisk expected Monday through late week - Elevated potential for grass fires due to warm and dry conditions and periods of moderate offshore winds next week && .SHORT TERM... Issued at 244 PM PDT Fri Mar 13 2026 (This evening through Saturday) Pleasant, above normal temperatures are expected across the region today with forecasted highs running 10-15 degrees above normal. However, there is one caveat to today`s high temperatures: cloud cover. Satellite shows high level clouds streaming across much of the Bay Area and Central Coast while a shallow marine layer is bringing low level clouds directly along the coastline. The shallow marine layer is keeping temperatures cool along the coast with both HAF and MRY at 55 degrees as of 1PM. Temperatures are a bit higher (mid to upper 60s) across inland areas where low level clouds have cleared. Made some tweaks to the high temperature forecast for today and bumped afternoon highs down to the low 60s directly along the coast to account for the persistent shallow marine layer. Generally expecting temperatures to peak in the mid to upper 70s across the interior today before cooling down into the upper 40s to low 50s tonight. If you have any outdoor activities today and Saturday will be the best days for them as they are the two coolest days of the upcoming forecast period. && .LONG TERM... Issued at 244 PM PDT Fri Mar 13 2026 (Saturday night through next Thursday) Upper level ridging builds in across the region Saturday before fully settling in by late weekend. Temperatures on Saturday will be fairly similar to those observed on Friday with highs in the upper 70s to low 80s across the interior and 60s directly along the coastline. Both HREF and WRF guidance suggest a shallow (500 ft) marine layer is possible again Saturday morning which will keep coastal areas cooler than interior areas. Saturday will generally be the last "pleasant" day of the Long Term forecast. By Sunday, the center of the upper level ridge will push into California and usher in the start of our prolonged heat wave. The center of the upper level ridge will then remain over the California/Arizona border through late next week, potentially sticking around into next weekend. This unusually strong ridge is bringing us late summer like weather with 500mb heights around 5900 meters. Sunday will act as a transition day between the more pleasant Saturday temperatures to full summer on Monday with highs in the upper 70s to mid 80s. Starting Monday, highs across the interior will rise into the upper 80s to 90s. It will then stay that hot through the remainder of the long term forecast. This has the potential to break numerous daily high temperature records and even some all time high temperature records for March. It is worth noting that temperatures may in fact go up during the second half of the week (starting Wednesday) as the ridge strengthens further. The NBM 95th Percentile (a reasonable high end scenario) pushes temperatures into the upper 90s to low 100s across the interior Central Coast and portions of the Santa Cruz Mountains/interior valleys Wednesday through late week. There is enough supporting evidence to say that this heatwave will extend through Friday and likely into the weekend given the longevity and restrengthening of the upper level ridge. Currently, Moderate HeatRisk is only forecast Monday through Wednesday but this is likely to expand through the rest of the week as the temperature forecast continues to increase. If you are spending any time outdoors this week, remember to drink plenty of water and allow your body to rest as needed. This heatwave is a marathon not a sprint with overnight conditions to offer at least some respite from daytime heat. Heat Advisories are likely to be issued for much of the urban areas and adjacent Santa Cruz Mountains/Diablo Range starting Monday and continuing through late week. For now, we are not anticipating issuing an Extreme Heat Watch/Warning as overnight temperatures will cool enough to prevent us from reaching Extreme Heat criteria. We will, however, need to keep a close eye on the forecast for the second half of the week as models are signaling that it could be even warmer than the first half. As small, fine fuels (grass) cure this week, the potential for grass fires will increase. Offshore winds will remain light to moderate which will help mitigate how much any fires that do develop can grow. If you are participating in any outdoor activities (camping, offroading, hiking, etc) exercise caution when using fire and be aware that the risk of grass fires will be elevated next week. && .AVIATION... (00Z TAFS) Issued at 450 PM PDT Fri Mar 13 2026 Light to moderate winds reduce into the night for areas not along the immediate coast, meaning HAF continues to see moderate winds through the night. Low CIGs look to form in the evening around the Monterey Bay into the night as well as at HAF, then STS looks to have moments of low CIGs and Mist into Saturday morning. Moderate winds return Saturday afternoon for most areas, while the coast (and HAF) see strong gusts. Cloud cover erodes into the afternoon but hazy conditions look to form in most of the valleys and along the coast into the weekend. Vicinity of SFO...VFR through the TAF period. Moderate west winds linger into the night before reducing. Northwest winds build again into Saturday afternoon and last into late that night before becoming light again. SFO Bridge Approach...Scattered low clouds look to move around the Eastern SF Bay into Saturday morning, with a few passing through the approach until the late morning. Monterey Bay Terminals...VFR lasts into the night before winds become light and IFR CIGs arrive to MRY. IFR CIGs will be slower to arrive to SNS, but are expected into early Saturday morning while MRY begins to see moments of LIFR CIGS. Expect some mist and reduced visibilities along with the building cloud cover. VFR returns in the mid to late morning as moderate west to northwest winds build. && .MARINE... (Tonight through next Wednesday) Issued at 450 PM PDT Fri Mar 13 2026 An unusually strong ridge of high pressure for this time of year will continue to build offshore and dominate our pattern through the extended forecast. Fresh to moderate north/northwest breezes will result in locally hazardous conditions through the weekend. Winds and seas will ease for the beginning of next week. && .CLIMATE... Issued at 614 PM PDT Thu Mar 12 2026 The following are the record high temperatures at the long term sites for March 15th, 16th, 17th and 18th. Location Mar 15 Mar 16 Mar 17 Mar 18 Santa Rosa 88 in 2004 91 in 2004 87 in 1996 84 in 2010 San Rafael 83 in 1972 87 in 1972 84 in 1972 80 in 1996 Kentfield 85 in 2004 86 in 2004 87 in 1914 89 in 1914 Napa 86 in 2004 88 in 2004 92 in 1914 87 in 1914 Richmond 85 in 2004 84 in 1972 83 in 2004 78 in 1996 Livermore 83 in 1972 88 in 1972 87 in 1972 86 in 2004 San Francisco 82 in 2004 85 in 1914 85 in 1914 86 in 1914 SFO Airport 81 in 2004 82 in 2004 82 in 2004 77 in 2004 Redwood City 84 in 2004 84 in 2004 85 in 2004 84 in 2004 Half Moon Bay 74 in 1974 78 in 1972 83 in 2004 75 in 1978 Oakland Museum 85 in 2004 85 in 2004 85 in 2004 81 in 2004 San Jose 82 in 2004 85 in 1914 88 in 1914 87 in 1914 Salinas Airport 83 in 1972 87 in 2004 87 in 2004 84 in 1960 && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 3 AM PDT Sunday for Pt Arena to Pt Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm. Small Craft Advisory from 9 PM this evening to 3 AM PDT Sunday for Pigeon Pt to Pt Pinos 0-10 nm. Small Craft Advisory until 9 PM PDT Sunday for Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory until 3 PM PDT Sunday for Pigeon Pt to Pt Pinos 10-60 NM. && $$ SHORT TERM...Kennedy LONG TERM....Kennedy AVIATION...Murdock MARINE...JM 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

406 FXUS66 KOTX 140034 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 534 PM PDT Fri Mar 13 2026 .KEY MESSAGES... - Heavy rain over the Palouse into Lewiston-Clarkston Valley and Camas Prairie will increase the risk of river and small stream flooding. - Wet snow impacting Friday evening commute for many of the lowlands. - Moderate to heavy mountain snow this week over the Cascades and North Idaho mountain passes. && .SYNOPSIS... A wet weather system will be situated over the Inland Northwest through tonight. Moderate to heavy precipitation with rain and a mix of rain and snow in the valleys. Rain over the Palouse into the southern Idaho Panhandle will lead to rises on rivers and small streams. Drier and breezy over the weekend and warming above normal next week. && .DISCUSSION... ...HEAVY MOUNTAIN SNOW, LOWLAND SNOW, AND POTENTIAL FOR FLOODING OVER SOUTHEAST WASHINGTON INTO THE SOUTHERN PANHANDLE CONTINUES INTO TONIGHT... Tonight through Saturday night: The near stationary moderately strong Atmospheric River (AR) will finally sag southeast overnight and turn of the spigot. This will occur once a cold front sweeps through from around midnight today in the Cascades to around 200-400 AM overnight in the Idaho Panhandle overnight. Until this happens, persistent light snow will continue across the Highway 2 corridor stretching from the Cascades and across the northern reaches of the Columbia Basin. Colder air moving in with the front and nocturnal cooling is expected to result in snow that is falling to accumulate again on roads. Expect an additional 1-3 inches with local accumulations above 2,000 feet of up to 4-5 inches. Snow intensities may pick up a bit as the cold front moves through just after midnight. Expect west slushy snow and slippery travel for the evening commuting period, and minor impacts to travel in the in the valleys in the early overnight period. Stevens Pass, Blewett Pass, and Lookout Pass will also continue to receive heavy snow accumulations through the evening into tonight. Additional snow accumulations at Blewett and Stevens Pass is expected to be between 4-10 inches and tapering up to snow showers around midnight tonight. The stretch of I-90 between 4th of July Pass and Lookout Pass will again see winter travel conditions tonight with heavy accumulations of between 8-16 inches for travel over the mountains passes and between 3-8 inches of additional snow for the Silver Valley. Flooding will also be a concern over the Palouse region into the southern Idaho Panhandle as persistent rain and low elevation snow melts results in rises to the Palouse River and other small streams and creeks. We will be keeping a close eye on rises along the Palouse River at Potlatch, Paradise Creek, Potlatch River near Spalding, Lapwai Creek, and Lawyer Creek as all of these areas are expected to see the potential for flooding impacts tonight into Saturday. Flooding of low lying areas and ponding of water on roads will be a concern as well. Snow melt will come to an end by Saturday morning with the passage of the cold front and temperatures decrease below freezing. The last bit of precipitation will also see a transition back to snow as well, and this should mitigate further flooding impacts; however, we still have a 9-12 hour wind still before get to that point. The cold front passage will bring good cold air advection and tighten up the pressure gradient with gusty west to northwest winds picking up Saturday morning. Expect breezy to windy conditions through the afternoon on Saturday sustained at 20-30 and gusting up to 40-45 mph. Strongest wind gusts to around 45 mph are expected on the Palouse, Lewiston-Clarkston Valley, and on the Camas Prairie. The orientation is a bit unusual with winds more west-northwest rather and west-southwest, which is a primary reason for why southeast Washington is expected to see the stronger winds compared to northeast Washington and the Northern Panhandle. Sunday through Friday: The weather pattern becomes much more benign for next week. This isn`t to say that there aren`t potential impacts to be mindful of. A ridge of high pressure builds Sunday through Monday. Even with this ridge, an active upper level jet with a warm front passage will occur Sunday night. Another robust sub-tropical moisture plume will extend across the eastern Pacific, but we will receive only a fraction of this moisture. Dynamics will also be limited with the warm front compared to the our current situation. This will result in much less precipitation with the warm front Sunday might through Monday. The Cascade crest will see up to around a half of an inch of precipitation. Snow levels will quickly rise with snow changing over to rain. Light precipitation will also fall over the northern mountains and into the Idaho Panhandle. Light snow is expected for the northern mountain valleys overnight Sunday into early Monday, but total accumulations are expected to be less than an inch and unlikely to result in impacts. Temperatures will warm up considerably next week and be near record values by Wednesday into Thursday with highs in the upper 60s to near 70 for. For reference, the warmest day on record for Spokane for Thursday is 69 in 2024 and the forecast is for a high of 67. The warm weather will result in low and mid elevation snow melt and rises on rivers. The Stehekin River will be of particular concern for flooding impacts as it is expected to see substantial contribution of melting snow into the watershed resulting in sharp rises. /SVH && .AVIATION... 00Z TAFS: A moist frontal boundary continues to Light to moderate snow will continue to impact KEAT/KMWH/KGEG/KSFF/KCOE through the evening. KEAT to KEPH/KMWH and KPUW will see rain, but the Spokane/Coeur d`Alene corridor will remain as snow into tonight. Snow will begin sticking at KGEG/KCOE as the sun sets this evening. A passing cold front A cold front between 08-12Z will bring drier air and improving ceilings and vis. It may take until the afternoon before the low clouds mix out of KGEG/KSFF/KCOE- KPUW/KLWS airport terminals though. Stronger winds mixing down with the front and a tightening pressure gradient will also result in gusty west to southwest winds on Saturday with gusts in the 20020 mph range. Low level wind shear is expected at KPUW until winds mix down late tonight around 12Z. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence for widespread IFR conditions. Low to moderate confidence in precipitation type this afternoon especially for KEAT as this airport is wavering right around the rain/snow line early this afternoon. High confidence on gusty winds starting late Saturday morning. ----------------------- 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 31 42 25 42 34 51 / 90 30 10 0 60 30 Coeur d`Alene 31 42 20 41 33 47 / 90 60 20 10 70 60 Pullman 32 40 25 42 34 51 / 100 80 20 10 60 50 Lewiston 39 47 30 47 39 56 / 100 80 20 0 50 40 Colville 25 44 21 43 30 49 / 40 20 0 20 60 40 Sandpoint 30 40 20 39 30 43 / 80 70 20 20 70 80 Kellogg 32 37 16 38 32 46 / 100 90 40 20 80 80 Moses Lake 31 47 27 47 35 59 / 70 0 0 0 20 10 Wenatchee 30 42 27 43 34 55 / 80 0 0 10 30 30 Omak 28 46 27 43 33 51 / 30 10 0 20 40 20 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...Winter Weather Advisory until 5 AM PDT Saturday for Spokane Area-Washington Palouse. Winter Weather Advisory until 10 PM PDT this evening for Upper Columbia Basin-Waterville Plateau-Wenatchee Area. Winter Storm Warning until 10 PM PDT this evening for Central Chelan County. Winter Storm Warning until 5 AM PDT Saturday for Western Chelan County. ID...Winter Weather Advisory until 5 AM PDT Saturday for Coeur d`Alene Area-Idaho Palouse. Winter Storm Warning until 11 AM PDT Saturday for Central Panhandle Mountains. && $$

269 FXUS66 KPDT 132330 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 430 PM PDT Fri Mar 13 2026 .DISCUSSION... Rest of Today through Saturday: A strong mid to upper level jet in zonal flow aloft will continue to sit over the region through the rest of today. The flow aloft will continue to facilitate the transport of an Atmospheric River, that has already brought several feet of snow along the WA Cascade crest and between 1 to 2 feet of snow to portions of the Northern Blues. In the lower elevations, precipitation amounts have not quite panned out to what hi-res short term model guidance has been suggesting the past day or two, but a few tenths have been observed along portions of the Blue Mountain foothills. Through tonight, the AR will continue to be pointed at the PacNW, but will sag south as an upper level trough slides into central BC. An attendant cold front underneath the AR will also push south, with snow levels beginning to gradually lower. This will allow some areas of the WA Cascade crest and the northern Blues see a heavy, wet snow return this evening. By tomorrow morning, the upper trough will slide southeast into northern WA, accelerating a colder airmass into the region, and with it quickly lowering snow levels to 2kft or lower by mid Saturday morning. With the last push of AR moisture making its way across the forecast area, this will result in a period of light to moderate snow across the Cascades, with moderate to locally heavy snow across the Blue mountains. There is mod-high confidence (65-85%) that the WA Cascade crest will receive another 7 to 12 inches and the interior northern Blues another 3 to 6 inches through Saturday morning. As the trough axis passes east of the forecast area Saturday afternoon, a cool northwest flow will develop aloft. This will keep temperatures below normal Saturday, while light upslope snow showers will result in another 1 to 2 inches along the Cascade crest and the northern Blues. The upper trough passage is also expected to bring breezy conditions across the forecast area Saturday. Winds will increase in the afternoon to 20 to 30 mph, while gusts will be 30 to 45 mph. Due to warming conditions in the Northern Blues, snowmelt and light rain on snow has resulted in runoff into area rivers. Currently, only the Walla Walla river near Touchet and the Umatilla river near Gibbon are forecast to reach flood stage in the next 24 hours. These will continue to be monitored through next week. Sunday through Thursday: Through most of next week, ensemble and deterministic guidance is in great agreement of an upper level ridge building over the western CONUS. The prominent high pressure over the region will result in a significant warming (for the time of year) across the region, with temperatures reaching the lower to mid 70s(10 to 15 degrees above normal) in the lower elevations by Tuesday, with moderate-high confidence (60-80%) that this will persist at least into Thursday. While the lower elevations will remain dry under the upper ridge pattern, the WA Cascades, northern portions of the OR Cascades, and the Northern Blues will see persistent chances (40-70%) of light rain late Sunday through Thursday. The reason for this is a fairly large AR clipping the PacNW as it rounds the upper ridge. Both ECMWF and GFS ensemble suites show over 80% chances of IVT>250 kg/m/s clipping the Cascades and the northern Blues, which has resulted in these chances. The warm air advection underneath the upper ridge will also result in snow levels at least over 7kft across the forecast area through the duration of this AR, which will also mean most of this precipitation will fall as rain(confidence 60-70%). Lastly, hydro concerns will arise not only from rivers coming from the Blues, but rivers along the WA Cascades will see rises next week. Snowmelt and the light rain on the existing snow pack will result in increased river levels, but confidence is low (15-25%) in any river segment reaching flood levels. Lawhorn/82 && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... There is a mix of flight categories across the region, with most sites VFR. However, YKM/PSC has had persistent MVFR and ALW has varied between multiple categories due to rain, BR and low CIGs. These conditions are expected to linger. Rain is expected to continue through the evening and overnight hours before ending on Saturday. Conditions are expected to improve everywhere on Saturday. Winds will increase again and while some sites continue to gust around 25 kts, most sites will be in the 20 to 30 kts range through Saturday morning. 90 && .Preliminary Point Temps/PoPs... PDT 38 48 27 51 / 90 60 10 0 ALW 38 47 30 50 / 100 70 20 10 PSC 39 52 29 52 / 80 20 0 0 YKM 30 48 27 48 / 80 0 0 10 HRI 41 52 29 52 / 80 30 0 0 ELN 28 41 25 42 / 90 10 0 20 RDM 37 47 24 53 / 60 50 0 0 LGD 37 47 26 49 / 100 90 30 10 GCD 40 47 25 52 / 60 80 10 10 DLS 38 51 33 50 / 90 10 0 10 && .PDT WATCHES/WARNINGS/ADVISORIES... WA...Winter Storm Warning until 5 AM PDT Saturday for WAZ522. Winter Storm Warning until 11 PM PDT this evening for WAZ523. OR...Wind Advisory until 5 PM PDT this afternoon for ORZ508. && $$ DISCUSSION...82 AVIATION...90

801 FXUS65 KREV 132103 AFDREV Area Forecast Discussion National Weather Service Reno NV 203 PM PDT Fri Mar 13 2026 .KEY MESSAGES... * Warm and dry this weekend with breezy winds and a slight chance of light rain near the Oregon border on Saturday. * Record-breaking warmth is expected next week as strong high pressure develops over the region. * Dry conditions is favored to last through the third week of March, but there are signs of wetter weather after the 23rd. && .DISCUSSION... While the weather will continue to be dry and unseasonably warm through the weekend, a cold frontal passage will provide minor cooling and breezy winds over the weekend. Saturday in particular will be the windiest day as a swath of 25-35 mph N/NW gusts will be common from NE California and N Washoe County, to the W NV Basin and Range, and into Mineral/S. Mono counties. Be prepared for gusty crosswinds along parts of I-80 and US-50, and choppy waters on Pyramid and Walker lakes. Farther west, winds will still be breezy Saturday afternoon but on the order of 15-25 mph. This cold front will certainly trend on the drier side, but a few light rain showers cannot be ruled out near the Oregon border (15-20% odds). Record-breaking warmth remains on track next week as strong high pressure overspreads the western states. In response, daytime highs will be in the 70s and 80s after Monday, which would be 20-25F above seasonal averages or more typical or early June. Such temperatures would easily set new daily high temperature records, and may even set Reno`s all-time March record for warmest day if KRNO exceeds 83F. While these temperatures are certainly not extreme, be sure to stay hydrated and avoid cooling off in area waterways, which will be running fast and cold as our snowpack continues to melt. This ridging pattern will also keep the region dry through at least next week, if not longer. However, there are some hints of precipitation showing up around/after the 23rd, so something to keep an eye on. -Salas && .AVIATION... The main weather concern through the weekend will be arrival of breezy N/NW gusts of 15-25 kts Saturday afternoon, which may pose LLWS impacts to regional terminals -- especially at KNFL-KLOL-KHTH where gusts may reach up to 30 kts at times. Otherwise, expect VFR conditions to prevail over the next 7-10 days. Density altitude issues may arise next week at western Nevada terminals as temperatures warm to 20-25F above normal. -Salas && .REV Watches/Warnings/Advisories... NV...Lake Wind Advisory from 2 PM to 11 PM PDT Saturday NVZ001-004. CA...None. && $$

273 FXUS66 KSTO 131936 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1236 PM PDT Fri Mar 13 2026 .KEY MESSAGES... - Dry weather with well-above normal temperatures expected through next week with Minor to Moderate HeatRisk && .DISCUSSION... ...Today-Sunday... Latest GOES-West visible satellite imagery shows partly to mostly sunny skies across interior northern California on this Friday afternoon. Temperatures continue to trend above normal for mid March climatology, with highs in the 70s to low 80s in the Valley and foothills and 60s to 80s in the mountains the next few days. The upper level pattern will feature the ridge flattening slightly over the weekend as a trough drops down to the east. This will allow for increased northerly flow behind it with gusts of 15 to 25 mph at times from Saturday into Sunday. Minor HeatRisk is also forecast mainly for the Valley and foothills. Relative humidity will be trending low as well, especially over the ridges and higher terrain. ...Monday-Thursday... The ridge will then build back in and strengthen. This will allow for the continued rise in temperatures into next week. There is still an impressive EFI (Extreme Forecast Index) signal for above normal temperatures. Forecast highs will rise to the 70s to low 90s next week. Widespread Minor HeatRisk is forecast for interior NorCal with areas of Moderate HeatRisk. Warmest temperatures are expected over the second half of the week, and have trended slightly warmer with this latest forecast package. Area waterways are still running cold from snowmelt. Be sure to plan ahead for the warmer weather and take the necessary precautions near waterways. && .AVIATION... VFR conditions are expected through the TAF period, with winds around 5-10kts going light and variable this evening and overnight. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$

482 FXUS65 KMSO 132023 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 223 PM MDT Fri Mar 13 2026 .DISCUSSION... KEY MESSAGES: - Additional Valley Snow Tonight: Steady snow is expected through the Flathead and Mission Valleys tonight. Snow is again possible in the Missoula and northern Bitterroot Valleys tonight but less certain with slightly warmer temperatures. - Intense Saturday Snow Squalls: High-impact snow squalls and a flash-freeze possible across northwest and west-central Montana Saturday afternoon and evening. The primary forecast challenge tonight remains the precise lowering of snow levels as heavy precipitation rates continue to drive top-down cooling across the region. Consistent snow is expected to develop and persist through the night for the Flathead and Mission Valleys. Residents should expect several inches of accumulation by daybreak Saturday. As the night progresses, the steady nature of the snow will begin to transition into more intense, cellular showers as the atmosphere destabilizes ahead of the arriving shortwave. The overall airmass is slightly warmer this afternoon, meaning that while rain is expected to change back to snow in the Missoula and northern Bitterroot Valleys tonight, accumulating snow on paved surfaces will be more difficult to achieve. Slushy conditions are the most likely impact on roads. However, any higher intensity bursts could still lead to quick, temporary accumulations before the more significant front arrives Saturday afternoon. Confidence is high that a frontal boundary will plunge south out of Alberta Saturday morning, reaching northwest Montana by midday and surging through west-central Montana during the afternoon. This setup is highly favorable for the development of frontal snow squalls. There is a 80 percent chance that intense bands of snow will impact the corridor between Kalispell and Missoula and along Highway 200. The timing is particularly concerning for I-90 from Lookout Pass to Homestake Pass; a period of heavy snow, gusty winds up to 45 mph, and rapidly dropping temperatures is likely. Any roads wet from earlier daytime melting will be prone to a "flash freeze," creating treacherous and unpredictable travel conditions through Saturday night. Conditions will briefly stabilize on Sunday as a Arctic air mass settles in the region. By Sunday night, overrunning moisture from a new Pacific system will reintroduce wintry travel concerns, particularly for the mountains and northern valleys. Looking further ahead, ensemble guidance strongly favors a shift toward a high-amplitude ridge starting Tuesday. While some "dirty" ridge cloud cover remains possible, a significant warming trend will take hold mid-week, with valley high temperatures potentially rebounding into the 50s and 60s by next Friday. && .AVIATION...Temperatures are slowly moderating in the valleys this afternoon with places like KMSO switching to a rain or rain/snow mix. There are indications that snow levels will lower overnight to near most valley floors in western Montana. Snow is likely to continue in northwest Montana with long-duration IFR conditions, including at KGPI. Widespread MVFR/IFR conditions will prevail across the region as consistent precipitation reduces visibility and ceilings. Terrain will remain obscured across all north- central Idaho and western Montana ranges. A trough passage on Saturday will transition precipitation to intense snow showers during Saturday morning, followed by a line of intense snow squalls (LIFR likely) and erratic winds along the Highway 200 and I-90 corridor from Saturday afternoon through Saturday night. These squalls are likely to impact KMSO and KBTM, causing sudden whiteout conditions and potential for rapid surface icing. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...Winter Storm Warning until noon MDT Saturday for Bitterroot/Sapphire Mountains...Lower Clark Fork Region... Potomac/Seeley Lake Region...West Glacier Region. Winter Weather Advisory from 9 PM this evening to 6 PM MDT Saturday for Flathead/Mission Valleys. Winter Weather Advisory until midnight MDT Saturday night for Butte/Blackfoot Region. ID...Winter Storm Warning until 11 AM PDT Saturday for Northern Clearwater Mountains...Southern Clearwater Mountains. Flood Watch through Saturday afternoon for Lower Hells Canyon/Salmon River Region...Northern Clearwater Mountains...Orofino/Grangeville Region...Southern Clearwater Mountains. Wind Advisory from noon to 9 PM MDT Saturday for Eastern Lemhi County...Western Lemhi County. && $$

336 FXUS65 KBOI 132331 AFDBOI Area Forecast Discussion National Weather Service Boise ID 531 PM MDT Fri Mar 13 2026 .UPDATE...Updated aviation discussion. && .KEY MESSAGES... - A strong cold front will bring gusty winds, isolated thunderstorms, and mountain showers tomorrow. The strongest winds are expected in the Lower Snake Plain, south of Boise. - Temperatures will dip below freezing tomorrow night, with much cooler daytime highs on Sunday. - An early season heat wave will lead to record high temperatures area-wide Tuesday through Thursday. && .SHORT TERM /Through Sunday Night/... Issued 222 PM MDT FRI MAR 13 2026 Breezy and cloudy conditions will continue through the evening for most of the region. Light precipitation in far northern Valley and Baker County is anticipated through the evening, with minor accumulations. A strong cold front is anticipated to move through the region tomorrow, bringing much cooler temperatures, gusty winds, isolated thunderstorms, and a brief period of valley rain and mountain snow. The front looks to move through northeast Oregon and the West Central Mountains early Saturday morning, hitting the Snake River Valley by the late morning. Embedded heavier showers and thunder are possible (<10% chance) along the front, with the better chance (20% chance) of a stray thunderstorm behind the front in the afternoon over southwest Idaho. Thunderstorms could produce outflow wind gusts up to 50-60 mph. Gusty winds will be the primary concern with this event, with sustained northwest to westerly winds around 30-40 mph and gusts from 50 to 60 mph on ridgetops and in the Upper Treasure Valley south of Mountain Home, Camas Prairie, and Magic Valley. The winds will not be as strong in the Boise area, with sustained westerly winds anticipated to be around 25-35 mph with gusts up to 50 mph. Winds will be slightly lower but still strong elsewhere, especially in valleys that can channel westerly winds. Crosswinds along north-south oriented roadways will make travel for high profile vehicles dangerous. Blowing dust is also a concern, primarily near fallow fields in the Magic Valley. This could temporarily reduce visibility to less than one mile along the US93 and I-84 corridors. After this frontal passage on Saturday, cool and mostly dry conditions with light winds will return for Sunday. Lingering light showers will continue for the mountains, with snow levels reaching valley floors on Sunday morning. Temperatures Saturday night will dip down below freezing for all of the area, a nearly 25 degree difference from the overnight lows on Thursday and Friday. && .LONG TERM /Monday through Friday/... Issued 222 PM MDT FRI MAR 13 2026 A strong and persistent upper level ridge remains the dominant feature across the Intermountain West through Friday, bringing an early heat wave to the region. Warming begins in earnest early in the period, with Monday temperatures propped up 15 degrees warmer than Sunday, reaching approximately 5 to 10 degrees above seasonal normals. By Tuesday, temperatures rise further to about 20 degrees above normal, threatening daily high temperature records for St. Patrick`s Day. From Wednesday through Friday, temperatures hold steady at 20 to 25 degrees above normal, with Thursday currently looking like the warmest day of the stretch with temps forecast around 80 degrees for many valley locations. Each day from Tuesday through Friday will not only threaten daily records but will also challenge the warmest maximum temperatures ever recorded for the month of March. We may even see our earliest 80 degree day in Boise. For historical context, the warmest day in March for Boise, Idaho, was 82 degrees set on March 26th 1877, and the earliest 80 degree day was March 19th 1997. Winds remain mild, and skies will stay partly cloudy. Afternoon relative humidity values are expected to range from 20 to 30% in the lowlands and 30 to 50% in the mountains. && .AVIATION /00Z Saturday through Sunday/... Issued 531 PM MDT FRI MAR 13 2026 VFR overnight under mid-high ceilings. Precipitation increasing, especially in the central ID mountains, Sat/AM with a cold front. LLWS ahead of the front. Localized MVFR conditions in Precip w/ mtn obscuration. Front exiting our area mid-day Saturday with scattered showers through Sat/PM. Isolated lightning Saturday. Snow levels: 6.5-7.5 kft MSL this evening, lowering to valley floors behind the front. Surface winds: Variable up to 10 kt overnight. Then W-NW 15-30 kt with gusts to 25-45 kt late Sat/AM through Sat/PM, strongest near KTWF/KJER. Winds aloft at 10kft MSL: W 30-50 kt. KBOI...VFR. Winds light and variable overnight, then W-NW 15-25 kt with gusts up to 35 kt late Sat/AM through Sat/PM behind a cold front. LLWS Sat/AM ahead of the front. Rain showers with periods of MVFR conditions late Sat/AM along the front. A 15% chance of lightning from Sat/15-23z. Weekend Outlook...Precipitation decreases Saturday evening. Areas of MVFR/IFR and mountain obscuration in precipitation. Snow levels lowering to 4-6kft MSL Saturday behind the front. Surface winds: W-NW 5-15 kt Sunday. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...High Wind Warning from noon to 9 PM MDT Saturday for IDZ014- 016-028-030. Wind Advisory from noon to 9 PM MDT Saturday for IDZ015-029. OR...Wind Advisory from noon MDT /11 AM PDT/ to 9 PM MDT /8 PM PDT/ Saturday for ORZ061>063. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise AVIATION.....NF SHORT TERM...SA LONG TERM....JDS

847 FXUS65 KLKN 132129 AFDLKN Area Forecast Discussion National Weather Service Elko NV 229 PM PDT Fri Mar 13 2026 .KEY MESSAGES... * A weak weather system clips over northern Nevada this weekend. * Strong gusty winds Saturday with patchy blowing dust possible. * Temperatures will turn cooler for the weekend but warming will re-commence throughout next week. * Near record high temperatures across the region into next week. && .UPDATE... Issued at 228 PM PDT Fri Mar 13 2026 No updates are planned. && .DISCUSSION... (This afternoon through next Friday) Upper level ridging remains off the southwest coast of the United States this evening. Look for mostly clear conditions tonight with overnight lows in the 30s to low 40s. On Saturday an upper level wave will dive to the southeast and across the northern Rockies. Northern and central Nevada will be in the southern periphery of this feature. Only light showers are expected with limited precipitation amounts seen across those locales north of the I-80 corridor. At this time, forecast precipitation amounts of 0.10 inches of rainfall is expected through Saturday. The main story will be the very strong winds. Winds are expected to shift to the northwest during the day. Most locales are in a wind advisory where winds will be 20 to 30 mph with gusts to 50 mph, though a high wind warning is in effect for northern and south-central Elko county and the Ruby Mountains. Winds here are expected to be 30 to 40 mph with gusts to 60 mph. These winds will continue through the early evening hours and then diminish. High temperatures will be in the 60s to low 70s. Any light precipitation is expected to diminish in the north through Saturday night with lows in the 20s and 30s. Upper level ridging will strengthen off the coast of California Sunday with a northwest flow continuing across northern and central Nevada. Winds will not be as strong as on Saturday with intermittent gusts to 15-20 mph across the area. Look for cooler temperatures Sunday afternoon as cooler air filters in from the northwest. Highs will be in the 50s to 60s. Quiet weather continues at night with lows in the 30s. All models are showing the upper level ridge dominating the weather as it drifts to the east from Monday through the end of the week. There are strong indications that afternoon highs will climb to record territory next week with readings in the 70s, climbing well into the 80s possibly by Tuesday and Wednesday and lasting through the week. Lows will be in the 40s. Winds are expected to remain light with isolated gusts to 20 mph. FORECAST CONFIDENCE & DEVIATIONS: Confidence is high with regards to the incoming wave to the area. With respect to winds, used a blend of 90 percentile winds and NBM forecast for the wind advisory locations with a blend of 95th percentile winds and NBM forecast for the high wind warning. Confidence is moderate, though increasing, for the big warmup next week. && .AVIATION...VFR conditions will be the main flight category through the next 24 hours. Strong W-NW winds will develop tomorrow with speeds 20-30G45KT across all terminals except KENV where stronger winds 25-35G50-55KT are possible. Patchy BLDU may affect terminals through the day with reductions to visibility to one mile or less during the afternoon and early evening. && .LKN Watches/Warnings/Advisories... Wind Advisory from 11 AM to 8 PM PDT Saturday NVZ030-035>038-040. High Wind Warning from 11 AM to 11 PM PDT Saturday NVZ031-033-034-039. && $$ DISCUSSION...86 AVIATION...86