926 FXUS66 KSEW 310344 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 844 PM PDT Fri Oct 30 2026 .SYNOPSIS...An upper level low will continue to weaken into Saturday, with drying and cooling conditions through the weekend. Upper level ridging will build through the first half of next week for continued dry conditions, before additional systems look to arrive by midweek. && .SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...Showers continue to taper off this evening, with a few lingering showers over western Washington. An upper level low will start to move southwards and weaken, taking away the showery influence over western Washington. We`ll start a dry and cool trend heading into the weekend, with afternoon temps staying in the low 50s. Overnight lows, especially tonight into Saturday morning, will cool, with areas in the Southwest Interior seeing below freezing temperatures in the upper 20s and low 30s. Therefore, a Freeze Warning is in effect for those locations. A Frost Advisory has also been issued for the northern Olympic Peninsula and north of Seattle as temperatures are expected to range between 32 to 36 early Saturday. Take the proper precautions to protect vegetation if needed. Besides the cold temperatures, should be dry for any trick or treaters. Dry and cool conditions through Sunday over the region. Overnight low temperatures will be flirting with freezing temperatures as well, in the low 30s. Mazurkiewicz && .LONG TERM /MONDAY THROUGH FRIDAY/...Ensemble guidance remains in reasonably good agreement for the first half of next week with an upper ridge remaining generally over the region for the start of next week. This will maintain mostly dry conditions, though a portion of ensemble members bring a weak disturbance into the ridge enough to bring some light precipitation chances (20-30%) west of Puget Sound. Another weak disturbance brings similar chances toward midweek. A more notable shift in the pattern becomes more likely late in the week with a stronger front approaching Western Washington, but it`s worth noting that there`s significantly increasing spread in the potential evolution of the pattern by that time. Cullen && .AVIATION...South to southwest flow aloft continues into Saturday as upper level low offshore digs southward into the Oregon and northern California offshore waters. The low level flow will turn light overnight. Coupled with areas of clearing, this will be conducive to the formation of IFR or LIFR low clouds and surface visibility locally below 3 statute miles by early morning. Low clouds are expected to lift and scatter out for most areas 18Z-20Z Saturday. KSEA...Last remaining showers will pass through this evening before some clearing takes place near or after 05Z. With surface moisture and light winds, this remains a favorable scenario for IFR low clouds to form. Low clouds should scatter out to VFR again around 20Z Saturday afternoon. Surface winds light and variable becoming E/NE under 7 knots toward morning. 27 && .MARINE...Weak surface low pressure over the coastal waters will remain in place into Saturday before dissipating as high pressure builds across the interior of Western Washington early in the coming week. Southeasterly winds over the coastal waters this afternoon will reach 15 to 20 kts at times, but should remain under small craft advisory criteria. Winds look to remain generally benign and light across the area waters through the first half of next week. Coastal seas 4 to 6 feet through the weekend. Seas will build to slowly build late Sunday into Monday, back around 10 to 11 feet as a larger swell train approaches. Mazurkiewicz && .SEW WATCHES/WARNINGS/ADVISORIES... WA...Frost Advisory from midnight tonight to 9 AM PDT Saturday for Downtown Everett / Marysville Area-Eastern Kitsap County- Eastern Strait of Juan de Fuca-Eastside-Foothills and Valleys of Central King County-Foothills and Valleys of Snohomish and Northern King Counties-Foothills and Valleys of the North Cascades-Lake Crescent Area Including US 101-Lowlands of Western Skagit and Northwestern Snohomish Counties-Lowlands of Western Whatcom County-Shoreline / Lynnwood / South Everett Area- Western Strait of Juan de Fuca. Freeze Warning from midnight tonight to 9 AM PDT Saturday for Lowlands of Lewis and Southern Thurston Counties-Middle Chehalis River Valley. PZ...None. && $$

819 FXUS66 KPQR 310554 AFDPQR Area Forecast Discussion National Weather Service Portland OR 1054 PM PDT Fri Oct 30 2026 .UPDATED AVIATION DISCUSSION. .SYNOPSIS...Clear skies and calm winds may bring frost and/or fog development across much of NW OR and SW WA in the mornings Saturday through Monday. Mostly dry conditions return this weekend. More uncertainty for the return of precipitation early next week with limited weather impacts expected. && .DISCUSSION...Now through Thursday...A northerly jet streak on the back side of the upper low will deepen overnight causing the upper level pattern to stretch into an elongated trough near the coast while the surface low drifts south and weakens offshore on Saturday. This will lead to a mostly dry day on Saturday, though as the trough finally moves inland Saturday, some wrap around moisture will bring 20-60% chance of rain showers over the OR Cascades and foothills late afternoon and evening with a 10-15% chance for Valley locations long and east of Interstate 5 south of Salem after 5 PM. Showers are expected to be light though on the chilly side as valley temperatures will quickly fall into the 40s around sunset. Completely dry conditions return Sunday as upper level ridging moves inland as the upper trough slides east of the Cascades on Sunday. Temperatures tonight into Saturday morning are forecast to become much cooler than previous nights with widespread low temperatures in the 30s, though cloud cover will be an important factor in whether temperatures will fall to near or below freezing. Latest model guidance indicates skies will become mostly clear late this evening into the overnight hours as showers dissipate. Clear skies combined with calm winds and ground moisture from recent rain will allow for radiational cooling but also for fog formation. If temperatures fall quicker than forecast under clear skies before fog forms, then low temperatures near or below freezing are more possible. However, if fog ends up forming, this could limit how low temperatures can fall in areas with fog. Because of this uncertainty, have converted the Freeze Watch to a Frost Advisory, which is in effect for much of the area west of the Cascades, including the coast. Outside of the major metro areas and foggy locations, there are higher chances for minimum temperatures to fall below freezing (around 60-80%). Otherwise, probabilities are closer to 20-40%. Frosty conditions are likely again Sunday and Monday mornings. However, freeze and frost headlines are only issued during the growing season of April 1 through October 31. Therefore, no additional freeze or frost headlines will be issued after Saturday. Ensemble guidance remains in relatively good agreement that upper level ridging and subsequent dry conditions remain over the region into early next week as another low pressure system develops in the eastern Pacific west of the OR/CA border and eventually moving inland over California midweek. However, there are a handful of ensemble members that bring the low pressure system inland over the PacNW sometime late Monday into Tuesday as a weak trough, allowing for a 10-20% chance of precipitation to return. If the drier solutions pan out, expect a slight warming trend with afternoon highs near 60 degrees for the interior lowlands through the middle of next week. Chances for rain increase slightly late week as some ensemble members indicate a frontal system approaching the area, but there is high uncertainty in specifics. At this point, no significant impacts are expected with the upcoming weather pattern. -03/DH && .AVIATION...Through 06Z Saturday... Mostly clear skies have returned to the region late this evening with some lingering showers right along the far NW Oregon coast into southwest Washington. Expect this trend in the showers to prevail the remainder to the night with dry weather favored at almost all terminals outside of KAST. The primary concern headed through tonight into Saturday morning will be fog formation. The moist ground, clearing skies, and calm winds have already begun to yield fog near KKLS and in some of the coast range valleys, and as the night goes on, confidence has increased in fog coverage rapidly expanding by 10-12z. The latest 00z REFS depicts a 50-70% chance for VIS to degrade below 1 mile at all inland terminals. Given the extremely favorable fog set-up and high resolution ensembles seemingly on-board, have added a period of LIFR/IFR conditions to most inland TAF sites Saturday morning. Confidence is low on exactly how quickly improvement may take place, or if fog/low clouds in the coast range will be able to extend to KONP and to a lesser extent KAST come the sunrise hours. Once fog/low clouds clear by 18-21z, VFR conditions return Saturday afternoon. KPDX AND APPROACHES...Confidence has significantly increased for fog related impacts at KPDX by sunrise Saturday with satellite observations already showing fog/low clouds rapidly developing along the Columbia River to the NW of the the terminal - verified by 1/2SM VIS at KKLS. Given this trend (development faster than most models) there is uncertainty as to just how quickly conditions deteriorate overnight but confidence for LIFR VIS/CIGS peak in the 12-17z timeframe which is reflected in the TAF. Winds remain fairly light, less than 5-8 knots. -99 && .MARINE...Weakening low pressure offshore will maintain southerly winds across the waters through this weekend, generally remaining under 20 kt. Winds weaken over the weekend. Seas around 5-6 ft today gradually subside to 3-4 ft on Saturday. Offshore winds develop late Sunday and persist into early next week. A long period west-northwest swell also arrives Sunday night, building seas to around 8 to 10 ft at 15-18 seconds by Monday. Chances for seas over 10 ft on Monday remain at around 40-60% across the outer waters. This long period swell will result in a moderate threat for sneaker waves Monday and Tuesday. Caution should be used when in or near the water. The next frontal system likely approaches the waters mid to late next week, returning southerly winds. -10/DH && .PQR WATCHES/WARNINGS/ADVISORIES... OR...Frost Advisory until 9 AM PDT Saturday for ORZ101>103-105- 107>109-111>115-119-123>125. WA...Frost Advisory until 9 AM PDT Saturday for WAZ203>207. PZ...None. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

860 FXUS66 KMFR 310104 AFDMFR Area Forecast Discussion National Weather Service Medford OR 604 PM PDT Fri Oct 30 2026 .KEY MESSAGES... * Temperatures will remain near or slightly below normal through the weekend and into early next week. * Widespread light to locally moderate showers are expected across the entire forecast area Saturday and Saturday night. * Dry conditions return Sunday through mid/late next week. * Along the coast, there is a moderate risk for sneaker waves Sunday evening through Monday afternoon. * By late next week, early signs pointing towards active weather returning to the area. && .DISCUSSION.../Issued 102 PM PDT Fri Oct 30 2026/ An upper low is centered offshore of Washington and northern Oregon today. This is bringing some isolated showers into the coast and Douglas County. The upper trough will elongate and the low will shift southward off the southern Oregon coast on Saturday, sending moisture into the area and bringing an increase in showers Saturday afternoon through Saturday night. Models and ensembles support widespread light to locally, moderate showers developing on Saturday with highest chances (50-70%) for showers across northern California and across the mountains from the Southern Oregon Cascades west. Periods of light showers are expected (30-60% chance) in valleys west of the Cascades and along the coast as well. East of the Cascades, in southern Oregon, expect scattered to isolated showers (20-50% chance). For Halloween evening (5 to 8 pm PDT), with scattered to widespread showers across the area, expect a potential for periods of light rain for most areas. Precipitation amounts are generally light with around a trace to 0.10 inches in 3 hours and the higher amounts are mainly over the mountains but also possible in the Ashland area, southern Shasta Valley and the Mount Shasta area. Locally moderate showers are also possible in Modoc and far southern Lake counties. The trough shifts inland Saturday night with showers continuing. Then as the trough shifts eastward on Sunday, expect showers to decrease in coverage. Breezy to gusty southerly winds are likely today and Saturday afternoon for areas east of the Cascades and in the Shasta Valley. Snow levels of around 5000-6000 ft on Saturday (and locally 4000-4500 feet west of the Cascades and in far western Siskiyou County), will lower Saturday night and Sunday morning to 4000-5000 ft. This combined with showers may bring a light dusting of snow across higher mountains, mainly above 5000 feet. High pressure returns Sunday night through Tuesday, bringing cool to cold morning temperatures, warmer daytime temperatures and dry weather. Areas of morning fog are expected Sunday and Monday morning for inland valleys and along the coast. Looking further out, a weak low moves into northern California from the west around mid week and will bring a chance (20-40%) for showers, mainly from the Cascades west and across northern California. Then a weakening front moves into the Pacific Northwest Thursday into Thursday night with chances for light precipitation over the area. However, this front may weaken substantially as it moves onshore, limiting how much precipitation falls. A potentially stronger front may move into the area late in the week or into the weekend. However, ensembles show significant variability on the strength of this system with some pointing to the front weakening as it moves onshore and others bringing widespread light to moderate precipitation. && .AVIATION...31/00Z TAFs...Fair weather cumulus is spread out across the forecast area this evening with bases around 3500 to 7000 feet. We should lose some of this cloud cover later tonight after sunset. IFR to LIFR ceilings and fog remain possible around Roseburg and the Umpqua Valley tonight as dewpoints are relatively high. VFR conditions are expected on Saturday with a mid level ceiling developing late in the TAF period. -Smith && .MARINE...Updated 1100 AM PDT Friday, October 30, 2026...Unsettled weather with occasional showers will continue through the weekend. Winds are expected to remain below advisory strength through at least early next week. Seas will be low through Sunday morning, dominated by a mix of west-northwest and south swell. A building west-northwest swell is expected to move into the waters Sunday and Monday, with swell building from 2 ft at 21 seconds Sunday afternoon to around 7 to 9 ft at 17 seconds around Monday afternoon. This will result in combined seas of 8 to 10 feet on Monday. Seas gradually lower Tuesday night into Wednesday. && .BEACH HAZARDS...Updated 1100 AM PDT Friday, October 30, 2026...Guidance continues to depict a long period WNW swell building into the area Sunday and persisting into early next week. Originating from a storm currently over the western Aleutian Islands, the swell arrives along the Oregon coast Sunday afternoon at 2 ft 21 seconds. These high-energy waves will have the ability to run much farther up the beaches and shorelines than normal and could produce dangerous sneaker waves. The swell will build to 4 to 6 feet at 19 seconds Sunday night then to around 6 to 9 feet at 17 seconds by Monday afternoon. So expect the sneaker wave risk will be most prominent Sunday night and Monday. Wave periods drop below 15 seconds Monday night; as a result, the risk of sneaker waves will lessen by Tuesday. && .MFR WATCHES/WARNINGS/ADVISORIES... OR...Beach Hazards Statement from Sunday evening through Monday afternoon for ORZ021-022. CA...None. PACIFIC COASTAL WATERS...Beach Hazards Statement from Sunday evening through Monday afternoon for PZZ350-356. && $$

111 FXUS66 KEKA 302149 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 249 PM PDT Fri Oct 30 2026 .KEY MESSAGES... * Light rain likely for Saturday. * Additional light rain early next week * Heavier rain possible with stronger Pacific storm systems remain in the week two extended forecast && .SYNOPSIS...More isolated areas of frost and freezing temperatures Friday night. A cold front will bring light rainfall with some possible isolated embedded thunderstorms Saturday through Saturday night. Additional light rainfall at times next week, some chances for heavier rainfall in the extended forecast. && .DISCUSSION...Rain chances increase Saturday morning as a NE Pacific trough moves in. Rainfall totals will be on the low side with the trough. The trough will turn negatively titled on approach and will contain some instability, so locally heavier rainfall amounts and perhaps some isolated thunderstorms are possible given the associated dynamics. This cold trough will lower snow levels and may bring small accumulations near 0.5 inch over Scott Mountain pass. The increasing cloudcover will limit coverage of frost and subfreezing temperatures where the growing season remains active, but areas of frost are expected through Mendocino and Lake counties. A transient ridge will pass through Monday ahead of another trough, brining slightly warmer and drier conditions. Chances for light rainfall arrive late Monday and increase Tuesday. There is only a 30 to 40% chance for rainfall over 0.1 inch for the area with that trough. A deeper low with a stronger front is modeled for late next week. This could bring some higher rainfall amounts and round of gusty southerly winds, but it does look to weaken as it nears the N CA coast. Rainfall chances for over 0.5 inch are currently only 25% for that system. For the extended forecast, the longer term guidance continues to outline a stretch of more active weather and atmospheric river potential over week two, somewhere near or after the 9th. Models guidance can overestimate storm strength in the extended through the transition into the wet season, but the signal seems to be becoming more consistent and bears watching. JJW && .AVIATION...VFR conditions continue across much of the area this afternoon. These are expected to continue through the evening. Towards morning a frontal boundary is expected to start approaching the area. This is expected to start lowering ceilings and will likely bring some showers to the area Saturday morning. Currently the models are showing fairly low probabilities of CIGS lowering very much. This may be underdone and cigs will drop lower in the rain. MKK && .MARINE...The waves remain fairly small with mainly just a couple of swells. One out of the northwest at 11 seconds around 4 feet and is expected to diminish tonight. The other one is out of the south around 2 feet at 14 seconds. Northerly winds have increased briefly in the southern to around 10 to 15 kt. Late tonight and Saturday winds will be less than ten kt. Some of these may be southerly as a weak front moves through on Saturday. Saturday night into Sunday northerly winds are expected to return again as high pressure builds in briefly. The most recent models are showing this to be fairly short lived and the northerly winds may not be very strong on the northern waters. Fairly light winds are expected on Monday with southerly winds starting as early as Tuesday. Also of a note, a very long period northwest swell is expected to start moving into the waters Sunday late in the afternoon. Initial waves are expected to be around 2 feet at 21 seconds. This will likely bring some fairly big sets of larger waves interspersed with smaller waves overnight and into Monday. This may show up on the shoals near harbor entrances. MKK && .BEACH HAZARDS...A very long period northwest swell is expected to start moving into the waters Sunday late in the afternoon. Initial waves are expected to be around 2 feet at 21 seconds. This is expected to start bringing a sneaker wave threat Sunday evening. These are expected to build to around around 6 feet at 17 seconds Monday morning. The be large enough to bring some fairly big sets of larger waves interspersed with smaller waves Monday morning. This is a fairly classic sneaker wave scenario with fairly limited waves besides this one. A beach hazard statement may be needed as it gets closer. MKK && .EKA WATCHES/WARNINGS/ADVISORIES... CA... Frost Advisory from 8 PM this evening to 10 AM PDT Saturday for CAZ110-111-114. NORTHWEST CALIFORNIA COASTAL WATERS... None. && $$ 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

895 FXUS66 KMTR 310549 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1049 PM PDT Fri Oct 30 2026 ...New SHORT TERM, LONG TERM, AVIATION... .KEY MESSAGES... Updated at 1030 PM PDT Fri Oct 30 2026 - Minor to moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the weekend - Seasonal to slightly below seasonal temperatures through the extended forecast - Potential for light rain Saturday and again next week && .SHORT TERM... Issued at 1048 PM PDT Fri Oct 30 2026 (Tonight through Sunday) Lots of talk about Saturday`s sensible weather the last few days and it`s been a roller coaster. A few days ago it looked somewhat wet for the Central Coast Saturday afternoon/evening. Then those chances eased and actually shifted northward to the Bay Area/N Bay. The latest forecast has actually eased precip chances Saturday afternoon/evening everywhere in the CWA. In other words, much more optimistic if you have any outdoor plans Saturday afternoon/evening. Let`s get into the details: the main weather players for the short term continue to be an upper low drifting slowly southward near the PacNW, an associated upper level trough south of the low inch its way toward the West Coast, and a moisture surge over the EPac (better surge heading into SoCal). Over the next 12-24 hours, the upstream upper low drifts farther south as the upper trough moves eastward and ultimately inland in CA. At the surface, a weak offshore cold front will follow the upper trough and move NW to SE Saturday afternoon/evening through the region. For the Central Coast, they`ll be on the northern fringe of the SoCal surge so a few showers are possible during the day across the far interior. Bay Area and North Bay start the day dry and remain dry well into the afternoon and early evening. There after, light rain chances increase over the North Bay spreading southward Saturday night into Sunday. As the front moves inland it begins to fade and so do the precip chances. A few showers linger early Sunday, but Sunday afternoon looks much drier. All in all, outdoor Halloween activities look promising with only a few showers moving into the North Bay. Better precip chances arrive Saturday night. Outside of precip chances, temperatures this weekend look seasonably cold with highs mainly in the 60s. This is still valid - A combination of high astronomical tides and surge from thermal expansion and low pressure effects brings the risk of minor coastal flooding along the Bayshore at the San Pablo, San Francisco, and Monterey Bays, and the Pacific coast, at high tide today. At the San Francisco tidal gauge, high tide is expected to be 1.5 ft above normal (7.3 ft MLLW) at 3:44 PM, and 1.0 feet above normal (6.8 ft MLLW) at 3:59 PM Sunday, including around 1.5 ft of surge residual." The Coastal Flood Advisory drops off after high tide on Saturday for the Pacific Coast but remains in effect through Sunday for bayshore locations along the San Pablo, San Francisco, and Monterey Bays. && .LONG TERM... Issued at 1048 PM PDT Fri Oct 30 2026 (Sunday night through next Friday) Weak upper level ridging Sunday night into Monday with dry weather and slightly warmer temperatures. There after the forecast looks unsettled with rain chances returning. The upper ridge moves inland as another upper low approaches from the west. Next round of rain returns Monday night into Tuesday and lingers into Wednesday. By no means any big or notable storms, but precip chances nonetheless through mid week. Dry weather and warmer weather returns Friday and into next weekend. && .AVIATION... (06Z TAFS) Issued at 1050 PM PDT Fri Oct 30 2026 Currently VFR with high clouds streaming into the Bay Area and low clouds across the Central Coast. High confidence in VFR and diurnal winds prevailing through the 24 hour TAF period. Beyond that, rain shower chances increase with the best chances between 06Z and 12Z. Ceilings and visibilities will briefly lower if a rain shower passes directly over a terminal. Vicinity of SFO...Currently VFR with westerly flow. High confidence in VFR and westerly flow prevailing through the TAF period, the exception is towards the end of the TAF period when rain shower chances increase. If a rain shower passes directly over the terminal, ceiling and visibility may briefly lower below VFR. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Currently VFR with southerly flow at MRY and VFR with easterly flow at SNS. High confidence in VFR and diurnal winds prevailing through the TAF period; however, low-end VFR ceilings will likely prevail through the TAF period. && .MARINE... (Tonight through next Thursday) Issued at 913 PM PDT Fri Oct 30 2026 Gentle to fresh northerly breezes prevail over the coastal waters as a weak cold front approaches from the north. These conditions will persist with moderate seas into early next week. Mid-week, wind driven seas build to rough across the outer waters. A long period southwesterly swell persists through the weekend and combines with a long period northwest swell early next week. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Coastal Flood Advisory until 6 PM PDT Sunday for CAZ006-506-508- 529-530. Coastal Flood Advisory until 6 PM PDT Saturday for CAZ505-509. PZ...None. && $$ SHORT TERM...MM LONG TERM....MM AVIATION...Sarment MARINE...MM 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

392 FXUS66 KOTX 310543 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 1043 PM PDT Fri Oct 30 2026 .KEY MESSAGES... - Patchy fog overnight. - Cool temperatures, light winds, and a slight chance (15-30%) for sprinkles or very light rain Saturday evening. - Rain chances increasing 20-60% late Saturday night into Sunday. Light rain accumulations up to a tenth of an inch expected over Southeast WA and the southern Idaho Panhandle. - Dry conditions Sunday evening through Wednesday. && .SYNOPSIS... Mid and high clouds increase Saturday bringing a small chance of sprinkles and showers to eastern Washignton and north Idaho in the evening. Dry air filters in Sunday and conditions remain seasonal and dry through Wednesday. && .DISCUSSION... Saturday and Sunday: The upper low offshore continues to fill in and slide to the south towards the northern California coastline Saturday evening. This will bring weak synoptic ascent into the region Saturday afternoon and evening, bringing small chances for light rain (5-15% chance over central WA, 10-30% chance for eastern WA and north ID). PWATs increase to 110-130% of normal Saturday afternoon and evening but dry air near the surface will only allow for sprinkles to a light drizzle mainly east of Ritzville. Rain amounts will be very light around a trace to a tenth of an inch through Saturday night. Light rain continues into Sunday for southeast WA and the central and southern ID Panhandle ahead of drier air filtering in from the west. Clouds will erode in the late morning and early afternoon Sunday in central and eastern WA and the late afternoon around sunset in north ID. The chances of a tenth of an inch or more of rain from Saturday afternoon to Sunday are around 20-50% south of I-90 and east of US-395. Monday through Saturday: High pressure builds into the region Monday bringing dry conditions and seasonal temperatures in the upper 40s to mid 50s. This ridge will be slightly disrupted Monday night into Tuesday by a shortwave moving through central BC and AB, bringing a small chance for snow showers in the Cascades above 3500 feet. Impacts look very minimal from this system. The ridge strengthens behind this weak wave Wednesday but chances for precipitation increase Wednesday night as troughing approaches the region. Models are in some disagreement with the position and strength of the placement of this trough but the overall message is there is a signal for unsettled conditions to return mid to late next week. Global ensembles continue to show a 60/40 split towards dry conditions continuing but this will change in the coming days as confidence increases. /DB && .AVIATION... 06Z TAFS: The HREF has miserably failed with the evolution of fog and low stratus this evening over the Palouse and Spokane area this evening. The model that has the best handle on the current situation for KGEG-KSFF-KPUW fog and low stratus is the high resolution Canadian model HRDPS. There is low confidence what happens but a flow reversal to east-northeast is expected tonight in the next few hours. The strength of this flow does not appear strong enough to make a huge difference in eroding the fog and low stratus through at least 15Z or so and actually reinforces the potential for it to continue at KGEG with upslope flow from downtown Spokane. NBM transport winds for KPUW are around 5 kt from the east which is most likely not strong enough to erode it before sunrise. By 15-18Z, day time heating will commence and at least lift this layer into an MVFR stratus and eventually erode. A low stratus deck developing north of KMWH has a 20% chance to bring degraded ceilings to KMWH around 12Z as boundary layer winds pick up out of the north. Once the fog and low stratus are gone Saturday morning, the area will be left with a layer of mid to high clouds. Top down moistening will occur late Saturday afternoon as weak synoptic ascent overspreads the region. There is a 15-30% chance of sprinkles to light rain at KGEG-KSFF-KCOE-KPUW-KLWS from 00Z-06Z Sunday with the highest chance for KPUW. Ceilings are forecasted to stay VFR through this period but models indicate potential to drop to MVFR after 6Z Sunday. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: Very low confidence in the fog and low stratus through 18z. High confidence in VFR conditions from 18z Saturday to 06Z Sunday. ----------------------- 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 52 33 52 37 51 32 / 0 0 0 20 0 0 Coeur d`Alene 53 33 52 37 52 33 / 0 0 0 20 10 0 Pullman 52 32 47 34 48 30 / 0 0 0 40 40 0 Lewiston 55 37 52 42 53 38 / 0 0 10 50 50 0 Colville 52 27 54 27 51 22 / 0 0 0 10 10 0 Sandpoint 52 30 51 33 50 29 / 0 0 0 10 10 0 Kellogg 54 33 51 36 51 33 / 0 0 0 20 20 0 Moses Lake 54 28 55 32 54 26 / 0 0 0 0 0 0 Wenatchee 51 34 54 37 52 34 / 10 0 0 0 0 0 Omak 51 31 54 34 51 29 / 0 10 0 10 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...None. ID...None. && $$

040 FXUS66 KPDT 310529 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1029 PM PDT Fri Oct 30 2026 .KEY MESSAGES... - Near- to below-normal temperatures into next week. - Medium- high (30-70%) chance of precipitation for central/eastern Oregon and southeast Washington over the weekend. - Low chance (30% or less, except for freeze-prone areas) of a season-ending freeze for the eastern Columbia River Gorge Saturday and Monday. && .DISCUSSION... Initially, the risk for limited visibility in fog continues locally over the Dead Mans pass in the Blue Mt Foothills area which has been expanding locally through the afternoon. Light winds converging in the area per mesonet obs leaves little to gain in confidence on the duration of this local fog. HRRR model suggests a broader shift form west to easterly winds after 01z. For Tonight, the cloud cover associated with the lingering upper low off the PAC NW coast is shown as clear to few based on satellite imagery over the eastern Columbia River Gorge. That area of clearing begins to fill back in with high and mid level clouds by the middle of the overnight, damping the probabilities for freezing temps at DLS. LAMP guidance now forecasting the upper 30s at The Dalles for Saturday morning. The upper low that has hung off the PacNW coast for several days will finally move inland as a deeper trough, moving into the Interior NW by Sunday morning. This will begin a pattern of increased rain chances for the central Oregon forecast zones by Saturday morning. Chances for showers will spread cross the southern mountains on Saturday and into the eastern mountains by Saturday night. Saturday night though Sunday morning will being the highest 6-hr precipitation/QPF window with mean NBM amounts bringing a few hundredths of an inch to around 0.15. Higher NBM QPF around a quarter of an inch is along the Eagle Caps. Potential for higher amounts of precipitation exists, with the 75th percentile NBM bringing a 48 hours basis of about one quarter of an inch over much of the the Northern Blue Mountains of Oregon, and the Northern Blue mountains Foothills and up to 0.60 of liquid equivalent to the the Eagle Caps/Wallowa county. Additionally, snow levels above generally 5000 ft will allow for a mix of rain/snow p-type above this level. NBM forecast about 1 to 3 inches of snow along the Eagle Caps. Behind the exiting trough/low is a short duration ridge sliding across the region on Monday which will result in dry conditions areawide and a bump in pressure gradient driven southerly surface winds across the Grande Ronde Valley. This moderately breezy setup for the Grande Ronde valley, as the 50th to 90th percentile suggest 20 to 25 knots sustained winds, which is approaching a wind advisory criteria (30 mph sustained) . && .AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...Mostly VFR conditions to prevail through the period. Overall, confidence is low (15-25%) in CIG/vsby impacts redeveloping tonight at most sites. The exception is at site PSC, where short-term high-res guidance indicates lowered vsby between 14Z to 17Z, so have included a tempo group during that time. Otherwise, the upper weather system offshore will push inland tomorrow, producing a prob30 chance of light rain at sites RDM/BDN after 01Z. Winds will be light, 12kts or less, through the period. Lawhorn/82 && .Preliminary Point Temps/PoPs... PDT 33 50 35 51 / 0 10 20 20 ALW 36 51 38 51 / 0 10 30 30 PSC 31 54 35 57 / 0 0 10 10 YKM 31 54 32 60 / 0 0 0 0 HRI 31 51 33 55 / 0 0 10 20 ELN 23 50 27 56 / 0 0 0 0 RDM 24 48 26 48 / 0 10 50 0 LGD 32 56 36 49 / 0 20 40 30 GCD 34 58 35 47 / 0 10 40 30 DLS 33 55 36 60 / 0 0 30 10 && .PDT WATCHES/WARNINGS/ADVISORIES... WA...None. OR...None. && $$ DISCUSSION...71 AVIATION...82

639 FXUS65 KREV 302040 AFDREV Area Forecast Discussion National Weather Service Reno NV 140 PM PDT Fri Oct 30 2026 .KEY MESSAGES... * Periods of mountain snow will create travel disruptions in and across the Sierra through the weekend. * Rain and a chance of thunderstorms expected this weekend, with light snow falling near valley floors early Sunday morning. * Warmer and drier weather prevails early next week, with another Pacific storm possible around midweek. && .DISCUSSION... A Pacific storm will continue to deliver periods of rain and mountain snow between today and early Sunday morning. Spotty, light showers today will become more widespread on Saturday ahead of an impinging cold front, increasing chances of rain and mountain snow to 70% or higher from midday Saturday to early Sunday morning. A few lightning strikes will also be possible (10-20%) Saturday afternoon as daytime heating couples with deep-layer moisture and strong synoptic lift. Heaviest Sierra snow is expected above 8000 feet Saturday afternoon into the overnight hours when snowfall rates approach 1"/hour. Highest peaks may see snowfall rates exceed 1"/hour at times. By Sunday afternoon, there is high probability (60%+) of 6" or more of fresh snow along the Sierra (above 8000 ft) with as much as 12-15" along highest peaks (30-50% chance). Pockets of greater snowfall totals may accompany heavier showers or thunderstorms that develop Saturday afternoon. Meanwhile, rain (or a rain-snow mix) will switch to all snow Saturday night for lower Sierra passes and roadways above 6000 feet where there is 30-40% chance of 1"+ of snowfall. As such, be prepared for slick roads and reduced visibilities when traveling in and across the Sierra this weekend. Snow levels lower further early Sunday morning as the cold front progresses, falling as low as 4500-5000 ft in the Sierra and Sierra Front. This will allow for light snow down to valley floors -- including the Greater Reno-Carson-Minden area -- around or just before sunrise, although no accumulation is expected. However, those in Virgina City may wake up to a dusting of snow Sunday morning. A brief warming and drying trend is expected early next week, then ensembles hint at another Pacific storm arriving around the middle of next week. -Salas && .AVIATION... Isolated showers and low clouds will produce brief periods of MVFR conditions and mountain obscuration into Saturday morning at Sierra terminals. A few showers may spill into W Nevada terminals, although low clouds and mountain obscuration will be the primary issue. Showers increase in coverage and likelihood Saturday afternoon, resulting in more prolonged periods of MVFR conditions for all terminals. Moreover, there is a low 10-20% chance of thunderstorms Saturday afternoon, which may briefly reduce CIGS/VIS to IFR conditions if storms drift over airfields. -Salas && .REV Watches/Warnings/Advisories... NV...Winter Weather Advisory from 8 AM Saturday to 7 AM PDT Sunday NVZ002. CA...Winter Weather Advisory from 8 AM Saturday to 7 AM PDT Sunday CAZ072-073. && $$

698 FXUS66 KSTO 302002 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 102 PM PDT Fri Oct 30 2026 For additional details on weather and expected impacts over the next 7 days, please visit weather.gov/sto/briefing. .KEY MESSAGES... - Light rain and mountain snow showers continue today for the Sierra and surrounding areas, accompanied by a low chance of isolated thunderstorms this afternoon into early evening - Cooler temperatures, rain and mountain snow above 7,000 feet Saturday into Sunday - Winter Weather Advisory in effect from 8 AM Saturday to 7 AM Sunday for elevations above 7000 feet in the Sierra Nevada - Drier and warmer conditions Sunday through early next week, but temperatures will remain below-normal for this time of year && .DISCUSSION... A slow moving weak cold front is traversing Northern California today. As of 11AM, isolated light rain and mountain snow showers continues over portions of the Sierra. Shower activity will continue this afternoon with mix rain and snow over the Sierra, with spotty rain showers in the vicinity. There is a low chance of isolated thunderstorms, capable of and brief heavy downpours this afternoon into early evening. Generally dry weather is expected for much of the forecast area through today. Increasing chances of precipitation is expected tonight and Saturday as a broad and deep upper low centered in the Northeastern Pacific and a low in the Eastern Pacific interact and shift eastward across the region through Sunday. Precipitations amounts have been trending slightly higher over the Sierra with this system, especially south of I-80 where up to 2.5 inches of rain is expected. The 00Z ECMWF Extreme Forecast Index highlight 50-70th percentile above normal QPF for portions of the Sierra south of I-80. Most likely rain total amounts range 0.5 to 2.5 inches over the mountains and 0.2 to 1 inch for foothills, with the highest amounts in the Sierra foothills. Meanwhile, lighter amounts ranging from a trace to 0.2 of an inch are expected for the Valleys and Coast Range, with the highest amounts in Shasta and eastern Modesto counties. Colder air aloft will bring an increasing instability on Saturday, capable of produce brief heavy downpours and a chance of isolated thunderstorms. Snow levels are expected to be above 7000 feet on Saturday, lowering to 6000-7000 feet Saturday night into Sunday. The snowfall total amounts are also trending higher with this system over portions of the Sierra Nevada, with the heaviest snowfall amounts expected above 7000 feet. Total snow accumulations up to 10 inches, with up to 25 inches at the highest peaks. Minor accumulations of up to 3 inches possible down to 6000 feet. Some light flurry will be possible as low as 5000 feet, but no snow accumulation are expected below 6,000 feet. A Winter Weather Advisory is now in effect from 8 AM Saturday to 7 AM Sunday for Northern Sierra above 7000 feet, including Highway 50 and Interstate 80. High pressure build in in the wake of the trough on Sunday. Resulting in drying and modest warming Sunday through early next week. Breezy to east northerly winds are expected to developed across the area, with the strongest winds over the Sierra. Clusters are showing another upper-level trough approaching the area Tuesday, but there is a lot of uncertainty in the timing and position of this system. && .AVIATION... VFR conditions prevail across interior NorCal next 24 hours. Surface wind gusts generally below 12 knots across Valley TAF sites through 20z Saturday, when occasional gusts up to 20 kts can be expected in teh northern Sacramento Valley, adjacent foothills, and in the mountains. Low to mid-level clouds will continue through Saturday, slightly lowering ceilings at TAF sites. Light Valley rain showers possible, with chances increasing late Saturday. && .STO WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory from 8 AM Saturday to 7 AM PDT Sunday for Sierra (Cal-Tuo) Above 5000 ft-Sierra (El Dorado-Amador) Above 5000 ft-Sierra (Sierra-Placer) Above 5000 ft. && $$

268 FXUS65 KMSO 301826 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 1226 PM MDT Fri Oct 30 2026 .DISCUSSION... KEY MESSAGES: - Valley rain and mountain snow Sunday into Monday morning, focused along and south of I-90. - High pressure bringing stable conditions and valley fog next week. GOES Satellite imagery this afternoon highlights a closed low spinning off the Oregon and Washington coastline, with southerly flow aloft sending mid-high level clouds over the Northern Rockies. Regional radar imagery shows shower activity across south-central Idaho, with high-resolution guidance suggesting this activity will shift northward through Lemhi County and west- central Montana into this evening. Overall, this shower activity will bring hit or miss rain amounts of a trace to up to 0.10 inches. On Saturday, the aforementioned closed low begins to move southeastward along the California coast. Shower activity will shift south of the area, with the majority of locations seeing mostly cloudy skies and dry conditions for Halloween activities. The exception will be across southern portions of Idaho and Lemhi Counties and along the divide in southwest Montana, where scattered showers will bring light precipitation amounts. The closed low will move across the Great Basin on Sunday, with moisture and lift focusing precipitation along and south of the I-90 corridor. The majority of precipitation will fall with snow levels ranging from 6,000-7,000 feet during the day on Sunday. As the low begins to pivot eastward into the central Rockies Sunday night, cold air advection aloft under northwesterly flow will bring lower snow levels, with snow falling down near 5,000 feet as precipitation rates begin to decrease through Monday morning. Overall, this doesn`t appear to be a significant snow event, with minor snow amounts (trace to locally up to 4 inches) above 6,000 feet across southwest Montana and Lemhi County. This includes the US-93 and I-90 corridor over Lost Trail and Homestake Passes. Ensemble model guidance is in strong agreement for high pressure to build across the western US Monday night into midweek. This stable pattern will lead to morning fog and stratus across many valley areas. The weather pattern through much of the week will be characterized by a split flow regime, with weaker systems attempting to break through the ridge of high pressure by Thursday into Friday, perhaps bringing periodic showers to the area. No significant and/or strong systems are currently on the horizon through next weekend. && .AVIATION...A disturbance is on track to pass through western Montana and north-central Idaho this afternoon and evening. This will bring scattered showers, lowering ceilings, and terrain obscuration across the region. As the disturbance exits tonight decreasing mid-level clouds will combine with a stable, saturated boundary layer. This environment points to a return of a mix of fog and low stratus developing overnight impacting sites like KGPI, KMSO, and KHRF. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. && $$

440 FXUS65 KBOI 310540 AFDBOI Area Forecast Discussion National Weather Service Boise ID 1140 PM MDT Fri Oct 30 2026 .UPDATE...Updated aviation discussion. && .KEY MESSAGES... - Partial clearing tonight through Saturday morning. - Widespread rain and high elevation snow late Saturday into Sunday, with the highest precipitation amounts across southern Idaho. A slight chance of thunderstorms Saturday evening. - Cooler with gusty winds Sunday, and especially Sunday night, then drying and warming Monday through Wednesday. Slight chance of precipitation late week. && .SHORT TERM /Through Sunday Night/... Issued 355 PM MDT FRI OCT 30 2026 The first of two pcpn events was exiting Idaho zones to the northeast this afternoon. This will be followed by partial clearing tonight before the next stronger system approaches Saturday. That system will include subtropical moisture, with further enhancement by a developing cold front in OR. Rain will spread northward into our CWA late Saturday, mostly on the Idaho side, and will affect our CWA strongly Saturday night through Sunday morning, with the cold front passing through Sunday morning. SPC still has a slight chance of thunderstorms Saturday afternoon and evening in southwestern Idaho. Latest model QPF has increased slightly from the previous cycle for Saturday afternoon through Sunday, with totals now estimated .40 to 80 inch in Idaho mountains, .15 to .30 inch In Idaho valleys and eastern Oregon mountains, and less than .10 inch in OR valleys. Winds will shift to northwest Sunday and increase Sunday afternoon, and especially Sunday night in the Snake Basin, possibly reaching advisory criteria east of Boise late Sunday night. && .LONG TERM /Monday through Friday/... Issued 355 PM MDT FRI OCT 30 2026 Upper-level ridging will build over the western CONUS early next week, returning dry conditions. Through the midweek, a weak upper- level shortwave will move onshore and through the Great Basin, although impacts are expected to be minimal. Greater impacts are expected late week when another system moves into the Pacific Northwest. Precipitation chances currently reflect some disagreement when the system will move in, but precipitation chances of 10-30% are currently forecast. Temperatures will cool slightly at higher elevations while holding nearly steady at lower elevations. Winds will generally be light through the week with patchy fog expected in valleys. && .AVIATION /06Z Saturday through Sunday/... Issued 1126 PM MDT FRI OCT 30 2026 Mainly VFR under SCT-BKN mid to high clouds, becoming more OVC Saturday. Patchy valley fog overnight through morning. Isolated showers returning Saturday morning, with coverage increasing in the afternoon/evening. Isolated thunderstorms near south-central ID in the evening. VFR-MVFR in rain showers, IFR-LIFR in mountain snow. Mountains obscured in precipitation. Snow levels 6500-8000 ft MSL. Surface winds: SE-SW 5-10 kt through morning, becoming S-SE 6-11 kt in the afternoon/evening. Winds aloft at 10kft MSL: S-SW 10-25 kt. KBOI...VFR with BKN-OVC mid-high clouds tonight through Saturday. Isolated to scattered showers Saturday afternoon, becoming widespread Saturday night. Surface winds: variable to SE 4-8 kt. Sunday Outlook...Precipitation continuing, tapering off from W-E. VFR-MVFR in rain showers, IFR-LIFR in mountain snow. Mountains obscured in precipitation. Snow levels lowering to 5500-6500 ft MSL. Surface winds: W-NW 10-20 kt with gusts 20-30 kt behind a cold front. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise AVIATION.....JY/ST SHORT TERM...LC LONG TERM....CH

160 FXUS65 KLKN 301748 AFDLKN Area Forecast Discussion National Weather Service Elko NV 1048 AM PDT Fri Oct 30 2026 .KEY MESSAGES... * Periods of valley rain and mountain snow this afternoon through Sunday night * A few strong thunderstorms possible both this afternoon and Saturday afternoon * Marginal risk of excessive rainfall Saturday afternoon through Sunday morning * Cooling trend this weekend .DISCUSSION... (This afternoon through Thursday) WEATHER PATTERN OVERVIEW: Cold temperatures aloft and minimal buoyancy should support isolated thunderstorm formation in parts of Eastern Nevada this afternoon. The primary thunderstorm hazards will be wind gusts near 45 mph and dangerous cloud to ground lightning strikes. An Eastern Pacific storm system will dig southward tonight, before making landfall over Northern California Saturday. This low pressure system will move eastward through Northern and Central Nevada Saturday night and Sunday, resulting in periods of valley rain and mountain snow. The majority of precipitation will fall Saturday night and Sunday morning. Snow levels will start at around 8,000 feet this afternoon, before dropping to about 6,500 feet Sunday morning. Here are probabilities of one inch or more of rain for select locations in Northern and Central Nevada from 5 PM PDT Friday, October 30th, 2026 through 4 AM PST Monday, November 2nd, 2026: Lund - 89% Lamoille - 73% Jiggs - 72% Ely - 67% Spring Creek - 66% Austin - 65% Duckwater - 64% Wells - 60% Elko - 57% Eureka - 47% Precipitation will come to an end early Monday morning at the latest. A cooling trend is expected this weekend. By Sunday afternoon, high temperatures throughout Northern and Central Nevada will be eleven to thirteen degrees below normal for this time of year. Dry weather is anticipated Monday afternoon through at least Thursday morning. A warming trend is expected Monday and Tuesday. By Tuesday afternoon, maximum temperatures across Northern and Central Nevada will be near seasonal values. High temperatures will remain near seasonal values both Wednesday afternoon and Thursday afternoon. FORECAST CONFIDENCE & DEVIATIONS: High forecast confidence regarding periods of valley rain and mountain snow this afternoon through Sunday night. Moderate forecast confidence in the possibility of a few strong thunderstorms both this afternoon and Saturday afternoon. Moderate forecast confidence regarding a marginal risk of excessive rainfall Saturday afternoon through Sunday morning. High forecast confidence in a cooling trend this weekend. No deviations from the NBM model output. && .AVIATION... MVFR conditions are likely in and near precipitation this afternoon through Saturday morning. Low forecast confidence regarding the exact timing and location of the precipitation. && .FIRE WEATHER... A storm system will impact Northern and Central Nevada this afternoon through Sunday night, resulting in periods of valley rain and mountain snow. The majority of this precipitation will fall Saturday night and Sunday morning. In addition, strong, gusty southeast to south winds are expected in parts of Central Nevada Saturday night and Sunday. && .LKN Watches/Warnings/Advisories... Winter Storm Watch from Saturday afternoon through Sunday evening NVZ034. && $$ 87