746 FXUS66 KSEW 242203 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 203 PM PST Sat Jan 24 2026 .SYNOPSIS...Upper level ridge offshore through tomorrow weakening Sunday night. The ridge will move inland Monday night and Tuesday. A splitting system will arrive Wednesday with a more consolidated system possible late in the week. && .SHORT TERM /TODAY THROUGH MONDAY NIGHT/...High pressure remains in control through the short term for ongoing dry and stable conditions. Minimum temperatures in the 20s expected overnight, similar to this morning, and a Cold Weather Advisory is in effect (coldest areas away from the sound). Otherwise, sunny and highs in the 40s on Sunday. Monday`s lows will be a few degrees warmer with increasing high clouds, however morning temps will still be near freezing in the metro area. 33 && .LONG TERM /TUESDAY THROUGH FRIDAY/...The ridge axis moves overhead on Tuesday for one last dry day. The ridge then shifts farther east on Wednesday while a weak front moves inland. Temperatures will moderate under moist, SW flow and lowland temperatures will remain above freezing. Snow levels will hover close to 4,000 feet with a few inches of snow on the higher mountain peaks and passes. Additional fronts reach the area over the latter half of the week for more lowland rain and mountain snow. Temperatures will track close to average. 33 && .AVIATION...A high amplitude ridge will begin to move across the area tonight into Monday, with winds shifting from northwest to southwest aloft. VFR conditions prevail across the region this afternoon and will continue to do so for most of the TAF period. Another round of freezing fog and low stratus, however, is on deck once again for the south Sound near OLM (25-35% prob) and CLM once again Sunday morning. Probabilities are lower for the metro area (15- 20%) and given the pattern the past few days, fog remains unlikely there. Winds remain light offshore, but most interior terminals have light and variable winds and will remain like so through the TAF period. KSEA...VFR conditions with clear skies. Light and variable, though mostly N/NE winds. There`s a 15-20% of low stratus, but this remains a low- probability scenario. 62 && .MARINE...Broad high pressure across the northeast Pacific will remain in place through the weekend with generally calm winds. The next period of impactful marine weather doesn`t look to arrive until Monday into Tuesday, as a weak frontal system approaches the west coast and brings back increasing southerly winds. A stronger frontal system will approach the waters mid- week, bringing a period of breezy southerlies across the coastal waters. Seas 3 to 5 ft will continue this weekend, increasing to the 8-12 ft range Wednesday and through the remainder of next week as systems move back into the area. Larger seas may be possible late next week as systems may develop in the Gulf of Alaska to produce large, long period swell. 15/62 && .HYDROLOGY...No river flooding in the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...Cold Weather Advisory from midnight tonight to 9 AM PST Sunday for City of Seattle-Downtown Everett / Marysville Area- Eastern Kitsap County-Eastside-Lowlands of Lewis and Southern Thurston Counties-Lowlands of Pierce and Southern King Counties-Olympia and Southern Puget Sound- Shoreline / Lynnwood / South Everett Area. PZ...None. && $$

993 FXUS66 KPQR 242155 AFDPQR Area Forecast Discussion National Weather Service Portland OR 155 PM PST Sat Jan 24 2026 .SYNOPSIS...Dry weather continues through the weekend as high pressure remains over the region. Cold overnight lows in the low to mid 20s through Saturday night/Sunday morning in the lowlands. Clear skies and light winds will result in frost formation for the interior lowland valleys and coast range Valleys. Chances for precipitation return Tuesday/Wednesday, but some uncertainty remains with the exact timing and precipitation totals. && .SHORT TERM...Now through Sunday Night...Benign weather continues for the region as high pressure persists over the Pacific NW and NE Pacific Ocean. Clear skies will bring efficient cooling across the region and result in cold overnight conditions returning tonight and Sunday night/Monday morning. Expect overnight lows tonight in the low to mid 20s for most locations west of the Cascades. Therefore, have issued another Cold Weather Advisory starting tonight through late Sunday morning. Conditions will also be cold in the Cascades but Cold Weather Advisory criteria is colder than lower elevations and is not expected to be met. Probabilities for temperatures to drop to or below 25 degrees are highest in the central and southern Willamette Valley at 65-85% while the northern Willamette Valley is only 40-50%. The Portland/Vancouver metro is even lower at 15-20% except for the more rural locations that range from 60-80%. Sunday night into Monday morning looks unfavorable for advisory criteria cold as cloud cover increases and winds decrease leading to only a 10-20% chance of reaching 25 degrees in the southern Willamette Valley, Clark county lowlands, and the Coast Range valleys. A weak frontal passage is expected late Sunday/Monday which will bring a 15-30% probability of precipitation for the Coast, Coast Range and Cascades. While little to no precipitation is expected with this system as the atmosphere is very dry. It will help to keep the atmosphere mixed as well as bring some slightly warmer air into the region. Another Air Stagnation Advisory may be warranted, mainly for the Willamette Valley as transport winds do decrease through the weekend. However, the weak frontal passage, mentioned above looks to keep the atmosphere mixed enough to mitigate any potential Air Stagnation concerns. Still, we will continue to monitor the situation and adjust the forecast as needed. /42/19 .LONG TERM...Monday through Friday...Models and their associated ensembles continue to support a pattern shift starting Tuesday/Wednesday as Pacific low digs across the Pacific. This looks to weaken the anchored ridge enough to finally see a substantial change in the overall forecast. While exact details remain unclear at this time, ensemble guidance is pointing towards a moderate PoP (35-60% chance) with relatively low/moderate QPF totals of 0.15-1.00 inches from Tuesday through Friday, with most of the precipitation being rain rather than snow or a wintery mix as snow levels are forecasted to rise towards 4500-5000 feet by Wednesday and 6000 ft or higher by Thursday. At this point, there are no major impacts expected with this weather system, and if precipitation does occur, it would be more beneficial than impactful. /42/19 && .AVIATION...High pressure will maintain VFR conditions with clear skies through this evening. Tighter pressure gradients between KTTD and KDLS will lead to breezy easterly winds through the Columbia River Gorge and far east Portland Metro (KTTD) with gusts up to 25 kt. Offshore winds continue along the coast with light northerly winds across the Willamette Valley. Tonight into early Sunday, the highest chances for LIFR conditions due to fog are around 15-25% across the southern Valley, mainly between 12-18z Sunday. Low confidence for fog as Sunday morning low temperatures across the Willamette Valley are forecast to fall to the upper 20s again. This will lead to another round of widespread frost, especially over metal surfaces. Will see high clouds gradually increase over the area after 18z Sunday ahead of a weak system, but conditions will remain dry. KPDX AND APPROACHES...VFR through the TAF period with clear skies through this evening. Variable winds around 5 kt or less. Expect another round of frost overnight. -10 && .MARINE...A weak thermal trough along the coast will continue easterly to northeasterly winds under 10 kt across the waters through Sunday. Winds turn more southerly Sunday night into Monday as a weak system moves in, however chances for widespread and frequent wind gusts exceeding 21 kt (small craft wind gusts) are only 10-20%. Seas remain around 4-5 ft at 11-12 sec through Monday night. The next frontal system approaches the waters on Tuesday, bringing breezier southerly winds and building seas. Chances for frequent and widespread southerly wind gusts of 21 kt or greater are around 50-70%, mainly for the waters beyond 30 NM offshore. A west- southwesterly swell will also move in by Wednesday and build seas to 10-13 ft (60-80% chance), with a 20-30% chance for seas exceeding 15 feet as early as Wednesday evening. -10 && .PQR WATCHES/WARNINGS/ADVISORIES... OR...Cold Weather Advisory from 10 PM this evening to 11 AM PST Sunday for ORZ104-105-108>110-114>118. WA...Cold Weather Advisory from 10 PM this evening to 11 AM PST Sunday for WAZ204>206-208. PZ...None. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

619 FXUS66 KMFR 250025 AFDMFR Area Forecast Discussion National Weather Service Medford OR 425 PM PST Sat Jan 24 2026 .UPDATE...Aviation Discussion Updated. && .AVIATION...25/00Z TAFs...Conditions are VFR areawide. Areas of LIFR in valley fog is expected to develop tonight (between 09-12z) in the Umpqua Valley, including Roseburg, and the Grants Pass area in the Rogue Valley. Conditions are expected to improve to VFR in the early afternoon on Sunday. At Medford, expect VFR conditions through TAF period due to drying and low dew points. Additionally, guidance only indicates a very low chance for fog (10-15%). Elsewhere, expect VFR to persist through the TAF period. && .PREV DISCUSSION... /Issued 129 PM PST Sat Jan 24 2026/ DISCUSSION (Today through Friday)... Key Points: * Widespread precipitation-free conditions through early next week - Morning fog for some westside valleys - Precipitation amounts have been trending downward * Cold airmass continues tonight Further Details: Persistence is going to be the key for tonight. Models have done really bad handling fog/low clouds. Given conditions look similar tonight, we are anticipating fog again tonight which will keep radiational cooling lower and hence warmer temperatures for some areas than it would be with clear skies. Trended temperatures to account for fog/low clouds. For areas across western Siskiyou County, temperatures will drop down to the upper teens, but this will fall just short of the criteria which is 6 to 15 degrees for a cold weather advisory. Either way, we are looking at another night of well below normal (~10 degrees) temperatures. We are still eyeing middle of next week for precipitation chances. The current trend has seen an increase in QPF amounts from ensemble data for coastal areas. However, much of the westside has a very low probability (10%-30%) of reaching 0.10"/6hrs. The coast and areas near the coast have see an increase to around 35%-45% for 0.10"/6hrs. That said, this really isn`t anything to write home about. The pattern is very progressive, so it does make sense to see these low QPF probabilities. What we need to happen is have the long wave trough which is consuming much of central and eastern CONUS to break down. This doesn`t look possible anytime soon. Cluster analysis of 500mb indicates this pattern holding on through Day9 which essentially favors a ridge over the PacNW. Guidance from the Climate Prediction Center (as of today) is indication in their 8-14 day outlook a very strong signal for above normal temperatures in addition to a signal for below normal precipitation. -Guerrero MARINE...Updated 100 PM PST Saturday, January 24, 2026...Winds have been gradually diminishing this afternoon, with steep seas becoming dominated by a moderate west swell. Conditions are expected to improve early next week. A more active pattern is expected to begin Tuesday afternoon, with increasing southerly winds (approaching advisory strength in the outer waters). && .MFR WATCHES/WARNINGS/ADVISORIES... OR...CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory until 1 AM PST Sunday for PZZ350-356-370-376. && $$

855 FXUS66 KEKA 242046 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1246 PM PST Sat Jan 24 2026 .SYNOPSIS...Dry weather and above normal daytime temperatures will continue through Tuesday. Overnight and early morning temperatures will remain chilly with patchy dense fog along the river valleys and around Humboldt Bay. Rain chances start to increase for Wednesday this coming week. && .DISCUSSION...Offshore, easterly winds, especially in Lake County are currently showing gusts from 25 to 40 mph over the exposed ridges. Winds are expected to diminish throughout the day into Sunday as the surface pressure gradient decreases. Satellite imagery depicts minimal cloud coverage, except for a surge of coastal stratus in southern Mendocino County. Cold, dry air advection alongside generally gentle to moderate offshore winds will continue to promote clear skies and cool temperatures and tonight into Sunday. As a result, strong radiational cooling will become probable across interior portions of NW CA, with some patchy fog development across the river valleys once again tonight. Freezing temperatures are forecast for the interior valleys with lows in the mid 20s to low 30s. Temperatures for the coast look to be in the mid 30s with a small chance (<15%) of freezing temperatures for some coastal valleys tonight. High pressure is expected to slowly weaken and flatten Sunday into Monday as a weak shortwave trough moves north of the area, bringing and increasing cloudiness. The 500 mb ridge appears to slowly build back early next week, with conditions slightly warming up. Ensembles and WPC Cluster Analysis continue to suggest a pattern shift as this seemingly never-ending ridge finally breaks down and an upper level trough digs southward across the Pacific, approaching the area by mid week. At this time, there is a 30-50% chance of wetting rain by Wednesday. There are no major impacts expected with this weather system; if precipitation does occur, it would be more beneficial than impactful, especially after the recent dry spell. /ZVS/DES && .AVIATION...18Z TAFs...VFR conditions firmly took hold after some lingering inland valley fog cleared out. Surface winds will be light and turning easterly overnight. The drying offshore flow will maintain VFR conditions through this 18Z period. Areas of fog may push northward up the Russian River valley through Santa Rosa overnight. This will have to be watched regarding fog chances at UKI. The much drier airmass is currently expected to limit this threat. Lingering surges Surges easterly to northeasterly winds of 30-40 kts aloft through 2000 ft AGL will bring a risk for turbulence and low level wind shear in Lake County through 9Z Sunday. && .MARINE...Northerly winds and seas have peaked and are trending lower. Steep seas will continue to lower through Sunday when combined seas are likely to fall below 5 ft by Sunday as winds remain light. A series of small, mid to long period west swells fill in through Wednesday, each peaking at around 5 ft. Winds turn southerly and start to increase early Monday. NBM currently shows about a 50% chance for gale force gusts in the outer waters by Tuesday. A large westerly swell looks to then build in Wednesday night and Thursday. JJW && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. 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

579 FXUS66 KMTR 242342 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 342 PM PST Sat Jan 24 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 121 PM PST Sat Jan 24 2026 - Clear today and tonight with cool overnight temps in the mid-30s inland - Offshore winds weaken by Sunday morning; light winds then prevail into mid-week - Slight chance of rain showers late Tuesday/Wednesday AM along coastal ranges and the North Bay. Amounts generally less than 0.1" && .SHORT TERM... Issued at 121 PM PST Sat Jan 24 2026 (This evening through Sunday) Generally fair weather across the board today. Temperatures this afternoon are about 10-20 degrees warmer than 24 hours ago thanks to today`s lack of Tule fog and stratus. In fact, the only cloud cover visible on satellite is a bit of stratus off the coast of Bodega Bay and some patch terrain-induced CU along the Big Sur coast. Temperatures are expected to be a bit chillier tonight due to the lack of cloud cover. Sunday morning lows will range from the mid-30s (interior) to low 40s (coastal). The only other notable mention in the short term is that we`ll have one more night of breezy offshore winds along interior ridgetops before the low pressure system responsible (part the same one wreaking havoc on the central and eastern US currently) moves out and is replaced largely by zonal flow aloft. This will relax surface pressure gradients and cause any offshore winds to diminish and become light, or even light onshore in some locations by Sunday afternoon. && .LONG TERM... Issued at 121 PM PST Sat Jan 24 2026 (Sunday night through next Friday) With mostly benign conditions through the early week, we`ll jump to Sunday when a weak upper level short wave trough is progged to move over the region. This will bring a slight chance of rain to the area. However, based on the most recent forecast updates it seems like this may be limited to coastal ranges as well as the North Bay. Amounts are very slim at a few hundredths of an inch for most and up to a tenth or two from the Golden Gate northward. By next Friday, some model guidance is advertising another chance for rain, but there is considerable uncertainty at this point to talk about anything specific. && .AVIATION... (00Z TAFS) Issued at 341 PM PST Sat Jan 24 2026 Currently VFR at all terminals with some stratus off of Bodega Bay and some high clouds streaming in from the Pacific Ocean. Moderate confidence that offshore flow and the resulting warmer and drier conditions will preclude sub-VFR conditions. The exception is STS where there is a signal for IFR-LIFR visibilities to at least briefly return overnight. Vicinity of SFO...Currently VFR and calm. Moderate to high confidence in VFR through the TAF period. Winds will back through the TAF period, becoming southeasterly tonight and northeasterly by early tomorrow morning. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Currently VFR with northwesterly flow at MRY and VFR and calm at SNS. Moderate to high confidence in VFR prevailing through the TAF period. Drainage winds will return this evening. && .MARINE... (Tonight through next Thursday) Issued at 341 PM PST Sat Jan 24 2026 High pressure over the Pacific Northwest and low pressure over southern California will maintain moderate to fresh northerly breezes through tonight. Improving wind and sea conditions will persist through the weekend to mid next week. Late next week a larger northwest swell will impact the coastal waters. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ SHORT TERM...Behringer LONG TERM....Behringer 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

565 FXUS66 KOTX 242350 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 350 PM PST Sat Jan 24 2026 .KEY MESSAGES... - Colder temperatures this weekend with overnight lows in the teens to low 20s - Quiet weather pattern through Tuesday, then a milder and potentially wetter && .SYNOPSIS... Colder temperatures are expected this weekend with overnight lows in the teens to lower 20s. A quiet weather pattern is expected through Tuesday before a milder and potentially wet pattern develops. && .DISCUSSION... Tonight through Tuesday: The dry pattern continues as an upper ridge off the coast provides a dry north to northwest flow aloft through Monday. Then on Tuesday the ridge axis progresses east across Eastern Washington and North Idaho. A moist boundary layer lingers this afternoon across the Palouse into the ID Panhandle with extensive stratus. The lower level flow changes heading into Sunday as boundary layer winds shift from southwest to east and southeast. This will in turn advect some of this moist boundary layer air into NE Washington for Sunday morning allowing for areas of low clouds and freezing fog to develop. Yet with the dry atmosphere with PWAT`s 40-60 percent of normal fog is expected to be shallow, and expected to dissipate in the late morning or early afternoon. The easterly flow will also be favorable for increased boundary layer moisture into the East Slopes of the Cascades with a similar scenario expected. On Monday and Tuesday the locations with best fog potential carry lower confidence with some different model solutions regarding boundary layer moisture. Wednesday through Saturday: Models have trended towards a more consolidated southwest flow during this period, with the GFS and ECMWF Ensemble means increasing precipitable water values to 150-200 percent of normal. This will lead to increasing chances for precipitation, and milder temperatures. The transition period from the colder and dry air mass to a milder one often proves to be tricky in terms of precipitation type. Although currently models show the initial bands of moisture to weaken when reaching the area, leading to low confidence if precipitation occurs when the milder pattern initially develops. Thursday afternoon through Saturday snow levels continue to climb such that there is higher confidence that precipitation type is rain in the valleys, with snow confined to the higher mountains. The latest NBM has snow levels during this period rising to 4500-5500 feet. JW && .AVIATION... 00Z TAFs: For this evening southwest boundary layer winds switch to east and southeast, which will advect some of the boundary layer moisture into NE Washington for tonight as well as near the Cascades, allowing for areas of fog and stratus to increase including KGEG/KSFF/KCOE and possibly KEAT. As the same time these downslope east boundary layer winds on the palouse and LC valley should help keep conditions VFR once the skies clear this evening. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: There is low confidence on the timing of when KGEG/KSFF/KCOE see degraded conditions overnight into Sunday morning as fog and stratus increases around NE WA/N Idaho. There is also low confidence on the degree of degraded conditions, as a mix of stratus and fog is expected. There is moderate confidence that when the skies clear at KPUW/KLWS that conditions remain VFR overnight into Sunday morning. JW ----------------------- 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 17 31 20 33 24 37 / 0 0 0 0 0 0 Coeur d`Alene 16 32 19 35 24 39 / 0 0 0 0 10 0 Pullman 20 33 22 35 28 41 / 0 0 0 0 10 0 Lewiston 22 37 24 40 30 44 / 0 0 0 0 0 0 Colville 14 30 17 31 20 35 / 0 0 0 0 0 0 Sandpoint 17 29 19 32 23 35 / 0 0 0 0 10 0 Kellogg 17 32 22 35 28 39 / 0 0 0 0 10 0 Moses Lake 18 34 21 34 23 39 / 0 0 0 0 0 0 Wenatchee 21 32 25 34 24 37 / 0 0 0 0 0 0 Omak 19 32 22 33 22 36 / 0 0 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...None. ID...None. && $$

465 FXUS66 KPDT 242209 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 209 PM PST Sat Jan 24 2026 .DISCUSSION... With a bit of northerly flow aloft, we managed to clear out across the region today and the sun actually made an appearance for the first time in awhile. However, the sun will be short lived as the ridge will re-establish itself over the course of the coming week. High pressure will build back over the region beginning on Sunday. However, a weak trough will then move over the Pacific Northwest on Monday. This trough should bring nothing more than slight chance pops (20 percent) for the Cascades. The high then rebuilds (along with fog and stratus chances) through midweek. A series of weak systems will affect mainly the mountains beyond midweek, that will break down the ridge and then build it right back up again. How much impact these systems will have on decreasing the fog and stratus remains to be seen. Ultimately, temperatures will be based on the stratus returning. If we return to being clouded/fogged in temperatures will be below normal. If we even get some breaks on some days, temperatures will be closer to normal. && .AVIATION... 00Z TAFS...Conditions have become VFR everywhere as the stubborn low clouds have broken. Expect VFR to continue through the period, with light winds. However, some brief lower conditions can not be ruled out Sunday morning, especially ALW and PDT. Probabilities are low enough (<30 percent) to not include in the forecasts at this time. && .PRELIMINARY POINT TEMPS/POPS... PDT 23 29 22 39 / 0 0 0 0 ALW 23 31 24 39 / 0 0 0 0 PSC 25 33 22 38 / 0 0 0 0 YKM 25 30 22 35 / 0 0 0 0 HRI 25 32 22 37 / 0 0 0 0 ELN 23 27 21 33 / 0 0 0 0 RDM 20 31 22 48 / 0 0 0 0 LGD 23 31 24 39 / 0 0 0 0 GCD 21 30 24 44 / 0 0 0 0 DLS 27 34 27 42 / 0 0 0 10 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...77 LONG TERM....77 AVIATION...77

213 FXUS65 KREV 242005 AFDREV Area Forecast Discussion National Weather Service Reno NV 1205 PM PST Sat Jan 24 2026 .KEY MESSAGES... * Gusty northeast to east ridge winds linger through tonight, with chilly breezes for western Nevada valleys. * A slow warming trend will bring back some valley inversions next week, then a weak weather system may bring chances for light showers, mainly along the Sierra mid to late next week. && .DISCUSSION... Brr! It`s brisk out there. Admittedly, it`s been pretty nice as of late and these moderately colder temperatures can`t hold a candle to the deep freeze for the eastern half of the country. Easterly ridge wind gusts have been well over 50-60 mph for much of the highest terrain today with several reports of wind holds at local ski areas. The winds will persist through much of the afternoon and evening with decreasing speeds into Sunday morning. Backcountry recreation and aviation impacts are expected for much of today, especially for areas along and west of the Sierra crest. Surface breezes in the lower valleys and foothills won`t be quite as strong with gusts 15 to 20 mph at most, but the breezes will contribute to the chill. Plan on weak high pressure for Sunday into Tuesday with a return of light winds and inversions. Another trough approaches the Eastern Pacific by Tuesday, but the Ensembles Clusters are on the struggle bus with the track/timing. Only 23% of the solutions show the trough tracking in across Northern CA, while the others are an array of dry results for the northern Sierra and western NV, including the trough becoming a cutoff low dropping toward SoCal. Blended guidance has a 10-20% chance for precipitation right along the Sierra crest. This is not the snow maker that we`re looking for. The ridge resumes residency following this little shortwave trough passage, with no big signals for something more prolific for our latitude. There are a few waves of moisture forecast to sweep into the Pacific Northwest, but the IVT moisture plume probabilities are looking rather dire for the Sierra and Western Nevada. Similarly, the 8-14 day outlooks are also the dry and warm side. -Edan && .AVIATION... * Colder, drier air has brought VFR conditions to most Sierra and Nevada terminals today after the patchy low clouds from this morning. The very dry, cold air will likely limit fog formation (less than 5% chance) at KTRK for tonight into early Sunday. * Primary concern for aviators will be the strong NE-E FL100 winds 25-35 kts through 06Z Sunday. Easterly surface wind gusts will be limited to around 10-20kts through 03Z Sunday. Localized areas of LLWS and turbulence possible along and west of the Sierra crest. * Inversions will return Sunday through Tuesday with light surface winds and a dry forecast. -Edan && .REV Watches/Warnings/Advisories... NV...None. CA...None. && $$

422 FXUS66 KSTO 242030 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1230 PM PST Sat Jan 24 2026 .KEY MESSAGES... - Breezy north winds and clear skies through tonight. - Patchy morning fog in the Valley possible through Tuesday. - Unsettled upper level pattern brings low chances for light rain showers and periods of breezy onshore winds mid to late week. && .DISCUSSION... ...This Weekend... Dry northerly winds pushed southward through the Valley this morning, confining any lingering fog and low clouds to the northern San Joaquin Valley as of early this afternoon. While winds gusting up to 35 mph will remain possible through the afternoon, they are expected to gradually decrease into the evening and overnight hours. As such, additional fog development into Sunday morning will likely remain patchy, with highest chances across the northern San Joaquin Valley. On Sunday, a weak, embedded shortwave aloft will bring increasing cloud cover to the region, although dry weather is expected to continue. Resultant temperatures will be seasonably cool, with highs in the 50s for the Delta, Valley, and foothills and highs in the 40s at higher elevations. Modest gains in humidity recovery are also anticipated overnight Sunday into Monday. ...The Week Ahead... Moving into next week, a more progressive upper level pattern looks to develop. Ridging aloft is expected to be the predominant feature through the early week, with periodic shortwave ejections mid to late week leading into a gradually more unsettled pattern. At this time, the only discernible plumes of weak atmospheric river moisture are centered further northward, resulting in some uncertainty regarding available moisture with any shortwaves that move through. As a result, chances for light rain showers sit around 15-25%, with the highest potential on Wednesday across the northern Sacramento Valley and surrounding terrain. Likewise, attendant probabilities of rainfall greater than 0.1" around 20-40% are currently forecast for these locations. Elsewhere, similarly seasonable temperatures are expected to prevail. High temperatures in the upper 50s to 60s at lower elevations and upper 40s to 50s at higher elevations are generally anticipated, with some variations later in the week dependent on cloud cover or lack thereof. Periodically breezy onshore winds may be possible with any shortwave ejections, otherwise, light, terrain driven winds look to remain the norm. Dry weather is likely to prevail from Interstate 80 southward until available moisture becomes more appreciable. && .AVIATION... VFR conditions expected to prevail at most sites through the forecast period, although some MVFR/IFR in BR/FG will be possible at SCK and MOD after 06z Sunday. Breezy north winds, gusting 20-30 kts at times, persist across the Delta, Valley, and foothills today, gradually decreasing from 00z onward. Breezy east- northeast winds along the Sierra to gradually decrease after 06z. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$

972 FXUS65 KMSO 242011 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 111 PM MST Sat Jan 24 2026 .DISCUSSION... KEY MESSAGES: - Cold temperatures through Sunday, with below zero wind chills along the divide overnight tonight. - Light snow along the Divide and southwest Montana through Sunday morning. - Dry, stagnant pattern Monday into Wednesday. Temperatures in the Northern Rockies will remain a little below normal tonight and on Sunday as a large area of arctic air east of the Continental Divide moves east. A weak shortwave will move north to south along the Divide today, bringing snow along and just west of the Divide in northwest Montana. Webcams this afternoon show it snowing in West Glacier. Chances remain good (about 60%) for snow to continue into Sunday morning. Expect accumulations on the light side though, as ensemble solutions show about a 20% chance of one inch of snow by Sunday morning along US Highway 2 from Essex east through Marias Pass. Other roadways with snow in the forecast overnight include Homestake, Rogers, and MacDonald passes, I-90 Drummond to Butte, and MT Highway 200 in the Blackfoot valley. A high amplitude ridge of high pressure will build over the West Coast on Sunday. The ridge moves inland, becoming centered over the Northern Rockies on Tuesday evening. This feature will bring dry, stable conditions that residents of the area have become accustomed to this January. There may be enough pressure gradient over the Northern Rockies to keep valley fog/low stratus at bay until Wednesday morning as a chunk of the upper level jet remains overhead. Agreement in model ensemble solutions begins to diverge later in the week, with some holding onto a strong ridge, while others depict a transition to westerly flow aloft. The latter solution would bring some weak shortwaves and enhance chances for light precipitation, while the former would result in ... well... you know... warm, dry, and stable with valley fog and low stratus. && .AVIATION...GOES Satellite imagery this afternoon shows widespread stratus clouds entrenched across north-central Idaho and western Montana. Light snow has been observed along the divide as pulses of moisture continue to move southward from Canada. A shortwave trough will move southward this evening, with light snow becoming widespread along the divide and in southwest Montana. Medium- high confidence exists for snow to impact KBTM overnight into Sunday morning. The timing of snow starting at KBTM remains the main challenge, with the current TAF taking a middle of the road approach with 4SM light snow starting by 25/0200Z. Visibility reductions can also not be ruled out at KMSO, with a 20% chance of 5SM or lower visibility from 25/0600-1200Z. Light snow will generally begin to exit Southwest Montana after 25/1200Z Sunday as this system moves east of the divide. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. && $$

583 FXUS65 KBOI 242103 AFDBOI Area Forecast Discussion National Weather Service Boise ID 203 PM MST Sat Jan 24 2026 .SHORT TERM...Tonight through Monday night... A passing shortwave trough across western Montana and eastern Idaho has led to a weakening of the low-level inversion that`s been in place. Mixing heights will remain quite low though (below 2000 feet during the afternoon). There is also enough remnant low-level moisture in place to support patchy low- level fog in the Long Valley into Sunday morning. Otherwise, very quiet conditions prevail as a gradual warming trend occurs into Monday. Upper ridging will build again into Monday across the Northwest and lead to a reinforcement of a low-level inversion and an increase in high clouds. .LONG TERM...Tuesday through Saturday...A gradual warming trend, driven by repeating upper-level ridge development, looks to be the pattern. Cluster analysis indicates that 500 mb height anomalies will remain above normal, which tracks with how this winter has gone. Repeated attempts of upper-level troughing will attempt to intrude over the area, beginning late Tuesday/early Wednesday onwards, but a majority of the moisture will remain out of reach. Strong inversion conditions look to return periodically during peak upper-level ridging. Relief may be granted by these passing upper- level troughs, but there remains much uncertainty. Regardless, conditions are expected to remain on the dry side for the entire week ahead. && .AVIATION...VFR. Patchy mountain valley fog early Sunday morning. LLWS early morning Sunday at KTWF and KJER. Surface winds: W-NW 5- 10kt, becoming light and variable after sunset. Winds aloft at 10kft MSL: NW 20-30kt. KBOI...VFR. Surface winds: NW 8-14kt, becoming light and variable after sunset. && .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 SHORT TERM...JR LONG TERM....CH AVIATION.....CH

758 FXUS65 KLKN 242001 AFDLKN Area Forecast Discussion National Weather Service Elko NV 1201 PM PST Sat Jan 24 2026 .KEY MESSAGES... Updated at 1201 PM PST Sat Jan 24 2026 * Near zero degrees apparent temperatures in the coldest valleys of Northern and Central Nevada tonight * Warming trend Sunday through Tuesday * Dry weather will prevail for at least the next several days && .DISCUSSION... (Tonight through Friday) WEATHER PATTERN OVERVIEW: Northwesterly flow aloft will keep cold air streaming into the service area tonight. Low temperatures throughout Northern and Central Nevada tonight will be around five degrees below normal for this time of year. Minimum apparent temperatures in the coldest valleys of Northern and Central Nevada will be near zero degrees tonight. An Eastern Pacific ridge of high pressure will make landfall along the west coast of the United States Sunday. This ridge of high pressure will weaken as it passes through the Silver State Monday. Another ridge of high pressure will amplify over the Western United States Tuesday. A warming trend is expected Sunday through Tuesday. By Tuesday afternoon, high temperatures across Northern and Central Nevada will be seven to nine degrees above normal for this time of year. Persistent anticyclonic flow aloft should keep the main storm track north of the Silver State Wednesday through Friday. Maximum temperatures across Northern and Central Nevada each afternoon Wednesday through Friday will remain above seasonal values. FORECAST CONFIDENCE & DEVIATIONS: High forecast confidence regarding near zero degrees apparent temperatures in the coldest valleys of Northern and Central Nevada tonight. High forecast confidence in a warming trend Sunday through Tuesday. High forecast confidence regarding dry weather prevailing for at least the next several days. No deviations from the NBM model output. && .AVIATION... VFR conditions will prevail at all terminals this afternoon through Sunday afternoon. North wind gusts near 25 knots are expected at KELY and KTPH this afternoon into early this evening. && .LKN Watches/Warnings/Advisories... None. && $$ 87