399 FXUS66 KSEW 072037 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 137 PM PDT Mon Sep 7 2026 .SYNOPSIS... Low pressure will move east of the Cascades tonight. High pressure will move in Tuesday and Wednesday for drier and warmer conditions. A pair of systems look to move through Thursday through the weekend for more chances for showers and cooler weather. && .SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/... Water vapor imagery shows Washington remaining under the influence of the broad upper level trough that has been sitting over the area since last week finally beginning to eject eastward towards Montana. Chances for light showers will continue this afternoon, but expect clouds to slowly decrease in coverage into this evening. Highs will remain in the mid to upper 60s, perhaps into the low 70s for places that see the most sun. Clearer skies expected this evening though expect another marine layer to start the day Tuesday. Lows in the upper 40s to mid 50s. Upper level ridging will briefly build across the area through Wednesday. Weak surface thermal troughing will develop on Tuesday and will allow the low level flow to turn offshore. Winds will not be very strong but it will allow for clear skies and temperatures to rise into the mid 70s on Tuesday, then into the upper 70s to low 80s on Wednesday. Low temperatures will also noticeably increase, up into the mid to upper 50s by Wednesday night. 62 && .LONG TERM /THURSDAY THROUGH MONDAY/... Ensemble guidance remains pretty well clustered through Thursday as the next disturbance drops down across the Pacific Northwest. This will bring a return of cooler marine air, cloud cover, rain chances. Typically windy locations may see increased breezes by Thursday evening in the stronger onshore low-level flow. Confidence begins to decrease a bit by Friday and into the weekend as the ensembles continue to depict a fairly large range of possible outcomes. Specifically, much of this uncertainty centers around the depth and timing of the next upper trough swinging across the region. However, regardless of specifics, there`s not a significantly strong signal for impactful weather. Expect increased clouds, cooler temperatures, and rain chances when the trough swings across, and slightly warmer and drier conditions once it passes. Cullen && .AVIATION... Northerly flow aloft as an upper level low exits western Washington. Mixed bag of conditions out there this afternoon as MVFR low clouds continue to linger throughout the interior. A mix between MVFR to VFR will continue this afternoon as clouds slowly lift up this evening (00z). VFR will continue overnight and into Tuesday, the exception being HQM, OLM, and PWT, where low clouds will develop 08z-13z, with MVFR/IFR intermittently throughout the early morning. N/NE winds will stay around 3 to 6 knots throughout the period. KSEA...VFR ceilings this afternoon with some low to mid level clouds around the terminal. Can`t rule out brief MVFR ceilings at times later this afternoon, but VFR should prevail throughout the remainder of the period. SW winds this afternoon 4 to 8 knots will transition to more N/NE this evening and into Tuesday morning, decreasing to 3 to 6 knots. Latest guidance suggests a 30% chance of MVFR clouds developing at the terminal early Tuesday morning, but confidence remains fairly low as the air mass continues to dry out - leading to most likely VFR conditions. Mazurkiewicz && .MARINE... High pressure will gradually build across the coastal waters through Wednesday. Winds will begin to increase tomorrow and could reach close to Small Craft Advisory thresholds by Wednesday night into Thursday (50-80% chc) over the outer coastal waters as the pressure gradient tightens due to an approaching frontal system from the north. Winds through the Strait of Juan de Fuca begin to increase Wednesday evening, with higher confidence of small craft winds through late Thursday morning. The frontal system weakens as it moves through on Thursday, allowing winds to ease area-wide. Another system may move through the waters late Friday into Saturday, but is currently not showing a signal for stronger winds. Seas remain 3-6 ft through Wednesday. Seas will increase Wednesday night into Thursday up to around 7-10 ft and become steep as short period waves from the stronger winds over the coastal waters begin to dominate. 62 && .FIRE WEATHER... Warmer and drier conditions develop across the region Tuesday and especially Wednesday. Given the recent cool and moist conditions, this will generally return the fire weather conditions trending back back to seasonal levels of concern. Light offshore flow late Tuesday into Wednesday could yield poor overnight RH recoveries on the ridges in Cascades and Olympics, with daytime humidities approaching critical thresholds. However, given the short-lived period of warmer conditions and offshore flow (more humid air returns by late Thursday with breezy onshore flow), do not expect a significant ramp up in the fire weather risk. Cullen && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...None. && $$

543 FXUS66 KPQR 072000 AFDPQR Area Forecast Discussion National Weather Service Portland OR 100 PM PDT Mon Sep 7 2026 .SYNOPSIS...Drier and warmer conditions persist through Thursday with temperatures gradually warming and peaking on Wednesday with the development of low-level offshore flow. The forecast becomes more uncertain Friday into Sunday, with the potential for weather conditions to range anywhere from cool and showery to warm and dry depending on the evolution of the large scale weather pattern. && .DISCUSSION...Tonight through Sunday...Confidence remains high that dry and warm weather returns to the region through at least the middle of this week. Model ensembles are in good agreement that the upper level synoptic pattern will develop into a col over the western portion of CONUS. A col also referred to as a "saddle point", is formed when there is a set of lows and a set of highs, that are in opposition to each other and results in rather benign weather for locations near the center or peak of the col. For our region, models have us on the eastern portion, which will enable the upper level high over the Great Basin to exert a little more influence in comparison to the other synoptic features. As the Great Basin high develops it will induce a weak, surface thermal trough that will build from northern California into western Oregon, which will result in weak offshore flow. Also, this will result in daytime highs warming in the upper 70s to mid 80s for inland valleys, upper 60s to upper 70s for the coast and lows 70s to low 80s for the Cascades, with the warmest temperatures expected on Wednesday. Thursday as well looks to remain warm and dry, but daytime highs are expected to be around 5-10 degrees cooler than Wednesday. Looking towards Friday and into the weekend, confidence in a cooler pattern developing has increased. WPC 500 mb clusters show around a 70% probability of a Canadian low dropping into the Pac NW, while the other 30% cut off the Canadian low and hold it in the northeast Pacific. Either solution will bring cooler temperatures to the are, with the more favored solutions bringing rain back into the forecast. Sill, even when looking at the favored solutions, uncertainty remains as to the strength, timing and location of the low. As such, ensembles are bringing cooler conditions back to the Pac NW for the latter part of the week and into the weekend. Deterministic, daytime highs for Friday through Sunday are in the mid 60s to mid 70s for inland valleys, upper 50s to upper 60s for the coast and upper 50s to upper 60s for the Cascades. However, it should be noted that daytime high temperature spreads from the 25th to the 75th percentile are around 5-10 degrees with the 10th to 90th spread around 8-15 degrees. So, there remains a lot of uncertainty with the forecast. The outcome will be highly dependent on how deep the trough becomes and if it tracks into Washington and Oregon or further to the east towards the Northern Plains, which will also determine whether or not rain will return to the area. As for rain, ensembles are pointing towards a more wetter solution, but precipitation totals are not expected to resemble what was observed last week. Current 48 hours totals ending 5 AM Monday is around 0.15-0.5 inches across most of the CWA, with the higher values over the Cascades. Overall, conditions through the middle of this week look to remain warm and dry. Cooler and wetter conditions are favored to return for the latter part of this week and into the weekend, but that doesn`t mean that those conditions are guaranteed. /42-03 && .AVIATION...Through 18Z Tuesday...Upper level troughing remains over the region today with northwest flow aloft. Mostly dry conditions expected as morning stratus is expected to become more scattered by 19-20z this afternoon. As of 17z, a few terminals are still reporting MVFR to IFR CIGs, including KUAO and KEUG. Expect predominately VFR conditions returning after 20z and continuing into the evening hours. Higher pressure begins to build across the area tonight into Tuesday morning. Guidance suggests there is around a 40-50% chance for stratus or fog to deteriorate conditions at the coast after 11-12z Tuesday. Expect generally light and variable winds at most terminals through the TAF period, with the exception of northwest winds around 8 kt at coastal terminals during the afternoon. KPDX AND APPROACHES...Expect VFR conditions to persist as skies gradually clear this afternoon. Light and variable winds becoming northwest around 4-6 kt this afternoon. /DH && .MARINE...High pressure offshore will maintain predominately northerly winds across the coastal waters through the week. A strengthening pressure gradient on Tuesday will bring stronger northerlies with gusts up to 25 kt as there is an 80% chance of wind gusts exceeding 21 kt by Tuesday evening. As a result, Small Craft Advisories have been issued from 11 AM Tuesday to 6 AM Wednesday for the outer coastal waters south of Cape Falcon, and from 2 PM to 12 PM Tuesday for all other coastal waters. Breezy winds continue through Thursday, but should remain 20 kt or less. Seas of around 4 ft with a dominant northwest swell at 10-12 seconds will gradually build to around 6 ft late Tuesday as wind chop increases with the northerly winds. A weak low pressure system is expected to approach the coastal waters late Friday into Saturday. /DH && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...Small Craft Advisory from 2 PM Tuesday to midnight PDT Tuesday night for PZZ210-251>253-271. Small Craft Advisory from 11 AM Tuesday to 6 AM PDT Wednesday for PZZ272-273. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

540 FXUS66 KMFR 072259 AFDMFR Area Forecast Discussion National Weather Service Medford OR 359 PM PDT Mon Sep 7 2026 .Aviation Discussion Updated... && .AVIATION...08/00Z TAFs...VFR prevails across the area this evening, with gusty north winds along the coast. Periods of MVFR/IFR ceilings are possible along the coast later this evening and overnight, but offshore flow could limit its duration and extent. All other area should remain VFR throughout the next 24 hours, although some pockets of MVFR/IFR in fog or low stratus are possible in sheltered valleys. && .PREV DISCUSSION... /Issued 239 PM PDT Mon Sep 7 2026/ KEY MESSAGES... * A Frost Advisory has been issued for valleys and basins east of the Cascades on early Tuesday morning. * Warmer and drier conditions are expected in the middle of the week, with peak warming on Wednesday. Area valleys and ridges may see easterly flow bring moderate to poor overnight recoveries. * Cooler temperatures are expected to end the week and through the weekend. Slight rain chances are in the forecast for Douglas and Coos counties. Elevated winds may develop east of the Cascades. && DISCUSSION...Northwest flow on the back side of an upper trough will help to keep temperatures below normal today, with generally clear skies across northern California and southern Oregon. Lingering cooler air and clear skies look to allow for possible frost development in east side valleys and basins early Tuesday morning. Localized freezing conditions are possible in especially cold areas, but these are not widely expected. Please see NPWMFR for more details on this product. Warmer and drier conditions remain in the forecast for the middle of the week, with relatively seasonable temperatures expected for Tuesday and Thursday. Wednesday will be the warmest day, with highs reaching 5 to 10 degrees above normal for most areas. This will put coastal cities in the mid to high 70s. Most west side valleys look to be somewhere in the 90s and parts of the Klamath River Valley could exceed 100 degrees. To the east, Klamath and Lake counties are forecast to be in the low to mid 80s while Modoc and eastern Siskiyou counties could reach the high 80s. Overnight easterly flow could bring moderate to locally poor recoveries to areas peaks and ridgelines through the middle of the week as well. An upper pattern change remains in the forecast on Friday as an upper trough starts to swing over the area, with the low pressure system within that trough moving over on Saturday and Sunday. Temperatures drop just below normal levels on Friday, with additional cooling on Saturday and Sunday. Depending on how deep the trough is, elevated west to southwest winds are possible, especially east of the Cascades. A deeper path may also allow for light precipitation, with current model runs showing increasing confidence for showers over North Bend and Roseburg. Even with the trend upward, weekend precipitation chances for Coos and Douglas counties are currently limited to 20-40%. -TAD && MARINE...Updated 200 PM PDT Monday, September 7, 2026...Gusty north winds and steep wind seas south of Port Orford will expand northward to Cape Arago tonight, then across all of the waters Tuesday through Tuesday night. Winds briefly diminish Wednesday. Then, gusty north winds and steep seas may return Thursday and Friday, mainly for areas south of Cape Blanco. && .MFR WATCHES/WARNINGS/ADVISORIES... OR...Frost Advisory from 3 AM to 9 AM PDT Tuesday for ORZ029>031. CA...Frost Advisory from 3 AM to 9 AM PDT Tuesday for CAZ085. PACIFIC COASTAL WATERS...Small Craft Advisory until 5 AM PDT Wednesday for PZZ356-376. Small Craft Advisory from 11 PM this evening to 5 AM PDT Wednesday for PZZ350-370. && $$

417 FXUS66 KEKA 072008 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 108 PM PDT Mon Sep 7 2026 .KEY MESSAGES... * Moderate sneaker wave risk continues today south of Cape Mendocino. * Much above normal temperatures likely Tuesday through Thursday, including along the coast. * Locally elevated fire danger for the higher elevations Tuesday and Wednesday. && .SYNOPSIS...The moderate risk of sneaker waves continue south of Cape Mendocino through this evening. Much warmer temperatures are likely Tuesday through Thursday, with warm temperatures even at the coast. Cooler temperatures return late this week into the weekend. && .DISCUSSION...Generally mild, near normal conditions are likely today as high pressure begins to rebuild over the area. Interior high temperatures are forecast to be in the high 80s to low 90s. Coastal stratus eroded late this morning bringing sunny conditions even to the coast. Coastal areas are likely to see high temperatures in the mid to high 60s. Tonight, light offshore flow may keep coastal stratus from reforming. The highest chances will be around Humboldt Bay, but this will likely not be widespread and perhaps only for a few hours. Offshore flow will bring warmer low temperatures as high pressure and warmer air aloft continue to build, with even the coldest interior valleys in the 40s or low 50s. Building high pressure Tuesday through Thursday will bring much warmer than normal temperatures, both to the interior and the coast. On Tuesday, temperatures are forecast to be in the high 80s to the mid 90s for most interior valleys, while the immediate coast could break 70. Wednesday and Thursday, the ridge strengthens, bringing near triple digit temperatures to most of the interior valleys. This includes valleys close to the coast which may not have experienced temperatures this high so far this year, including Garberville and the Eel River valley. Interior areas will see widespread Moderate HeatRisk which corresponds to a moderate risk for heat-releated illness to those without proper cooling. Drink plenty of water and stay safe out there! Coastal areas also continue to warm as offshore flow continues to inhibit coastal stratus formation with 70s possible at the immediate coast and 80s possible just a few miles inland. Subtropical moisture from the remnants of Hurricane Marie arriving Wednesday will complicate the forecast somewhat. Instability continues to be modeled near zero with a less than 5% chance for MUCAPE over 100 J/kg. Still, cloud cover could bring slightly lower high temperatures than currently expected Wednesday, along with a few virga showers. Troughing rebuilds late this week into the weekend, returning near normal temperatures and coastal stratus by Friday. By this weekend, much of the interior is forecast to be in the 70s and 80s with the coast in the low 60s. A weak front moving north of the area may bring a few light rain showers to Del Norte County this weekend, but chances remain low (around 20%). /JB && .AVIATION...(18Z TAFs)...Stratus has cleared along the coast and only a few high clouds are being observed across NW California. Offshore winds developing overnight is expected to limit stratus reformation tonight. Still, HREF is showing around 20% chances for IFR to LIFR stratus to form around Humboldt Bay which may affect ACV. Any stratus will likely lift and scatter shortly after sunrise on Tuesday. Otherwise, VFR conditions are expected for the next 24 hours. /JB && .MARINE...Northerly winds build today and peak this evening. Near-gale force gusts are possible in the lee of Cape Blanco and Cape Mendocino late this afternoon and this evening. Steep seas of 6 to 10 ft are possible with these winds and may propagate into the nearshore waters. Both winds and seas ease Tuesday as the pressure gradient weakens. Breezy northerly winds return Thursday and are likely to continue south of Cape Mendocino through the weekend. Along with wind driven seas, a long period south swell from Hurricane Marie at around 3 to 5 ft will persist through the week. /JB && .FIRE WEATHER...Much warmer and drier conditions are expected as high pressure rebuilds this week. High temperatures in the interior valleys will climb in the high 90s to just over 100 Tuesday through Thursday. Afternoon relative humidities will fall into the teens or single digits in the eastern portions of the area. Offshore flow developing overnight will result in poor overnight recoveries for the higher elevations and winds may be locally breezy. Near-critical to locally critical fire weather conditions are possible in the highest elevations of Del Norte, Trinity, and Humboldt Counties Tuesday night and early Wednesday morning with these breezy winds. Troughing late this week into the weekend will return cooler temperatures and a deeper marine layer. && .BEACH HAZARDS...A long period southerly continues in waters, only slowly losing energy through the week, but 15 to 16 second periods are still being recorded. Thus, there is an ongoing risk of sneaker waves today for south facing beaches in Mendocino and Southern Humboldt counties, including the Lost Coast Trail. Sneaker waves are a unique hazard, with up to 30 minutes between waves. Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath. Even ankle to knee deep water can knock you down and drag you out when a sneaker wave hits. Pay attention and stay above the high water line and any wet sand to stay safe. If the ground is wet, waves have surged there recently. Stay safe and never turn your back on the ocean! && .EKA WATCHES/WARNINGS/ADVISORIES... CA... Beach Hazards Statement until 11 PM PDT this evening for CAZ104-109. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 6 AM PDT Tuesday for PZZ455. Small Craft Advisory until midnight PDT Tuesday night for PZZ470. Small Craft Advisory until 6 PM PDT Tuesday 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

244 FXUS66 KMTR 072345 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 445 PM PDT Mon Sep 7 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1214 PM PDT Mon Sep 7 2026 - Hazardous conditions at Pacific Coast beaches through Monday evening - Warming and drying trend will bring widespread moderate to major HeatRisk through Thursday && .SHORT TERM... Issued at 1214 PM PDT Mon Sep 7 2026 (This evening through Tuesday night) Hazardous conditions at Pacific Coast beaches continues today. Long period southerly swell from distant Tropical Storm Marie will result in an increased risk for sneaker waves and strong rip currents with breaking waves up to 10 feet. Stay off the beach and remain out of the water to mitigate your risk. Minor coastal flooding will be possible during high tide this evening for bayshore locations along the San Pablo Bay in Marin County. The warming and drying trend has already commenced with conditions notably warmer and drier than they were 24 hours ago. High pressure will build in from the east tomorrow, peaking Wednesday and Thursday. Uncertainty in the forecast stems from Marie`s moisture. Fortunately from a fire weather standpoint, the mid-level moisture and associated rain/thunderstorm chances are expected to remain confined to our south and west. However, associated high-level clouds are expected to stream in Tuesday into Wednesday which could make highs lower and lows higher due to decreased solar insolation and radiational cooling, respectively. We aren`t even going to have the marine layer to save us this heat event. Reason being, flow aloft has an easterly component as it wraps into Marie. If we miraculously get any sort of marine layer, expect it to be compressed below 500 feet which would bring dense fog to coastal locations. A Heat Advisory has been issued for all areas and will run from 10AM Wednesday through 10PM Thursday. Temperatures will be 10 to 20 degrees above normal with minimal onshore flow. There are high probabilities for moderate and even major HeatRisk during this time; in fact, San Francisco has a high probability (70%+) that the eastern half of the city will reach or exceed a maximum temperature of 80 degrees on Wednesday. Onshore flow is expected to return on Thursday which may be enough to remove coastal locations from the Heat Advisory; however, we will likely wait to see how Wednesday`s forecast fares before making any changes. To put this heat event into context, 850 mb temperatures and 500 mb heights are going to be between the 90th percentile and daily record values which indicates that we are dealing with an anomalously warm airmass with higher than normal heights. Two things that are preventing this from being a widespread record breaking event is September is climatologically the warmest month of the year for most of our area and we have benchmark records dating back to 1944. && .LONG TERM... Issued at 1214 PM PDT Mon Sep 7 2026 (Wednesday through next Sunday) Global ensemble clusters are in agreement that the ridge will be tamped down by an upper-level low digging into the Pacific Northwest Friday. This will kickoff the cooling trend with temperatures moderating to near normal. The tightening of the pressure gradient will bring an increase in onshore flow and strong northerly breezes across the waters. && .AVIATION... (00Z TAFS) Issued at 442 PM PDT Mon Sep 7 2026 Northwesterly winds have developed this afternoon and are likely to persist through sunset before diminishing. Wind become light/variable overnight before becoming offshore at times early Tuesday morning. Low confidence for stratus to return early Tuesday morning around the Bay Area with the greatest potential being around the Monterey Bay terminals. VFR conditions are forecast regionwide beyond 16Z-18Z Tuesday. Onshore winds return Tuesday by early afternoon, yet may be delayed in timing and not occur until closer to 00Z Wednesday. Vicinity of SFO...VFR. Onshore winds have developed this afternoon and are forecast to persist through late evening. Winds ease into Tuesday morning and become light/variable or offshore at times. There is low confidence for stratus to return early Tuesday morning with generally less than 20% probability of reaching MVFR ceilings. Thus, have left out of the official forecast at this time. Onshore winds return late Tuesday morning and will persist through the evening. SFO Bridge Approach...The potential for MVFR CIGs Tuesday morning is less than 10%. Otherwise, similar to SFO. Monterey Bay Terminals...VFR. Onshore winds have developed this afternoon between 06-12kt. Winds ease late this evening after sunset and become light/variable early Tuesday morning. There is now a 30- 60% probability for IFR between approximately 06Z-17Z. Thus, have introduced IFR conditions into the official forecast overnight and into early Tuesday morning. Once any low clouds that do develop mixout, expecting VFR conditions to return by around 17Z. && .MARINE... (Tonight through next Saturday) Issued at 442 PM PDT Mon Sep 7 2026 Northwest winds gradually diminish to gentle to moderate tonight which then prevails through the remainder of the week. Winds look to increase late this week into the weekend. A long period southerly swell induced by distant tropical cyclone activity in the East Pacific prevails into next week. && .BEACHES... Issued at 1213 AM PDT Mon Sep 7 2026 A Beach Hazards Statement is in effect through 11 PM this evening. Moderate to long period swell will increase the chance for sneaker waves, since there are 2 different sets of southerly swell, and their energy will periodically combine. In addition to sneaker waves, expect strong rip currents and breaking waves up to 10 ft. As this is a holiday weekend and the weather is otherwise pretty nice, the exposure to the risk is high. Avoid the water if you`re not an expert swimmer. If caught in a rip current, swim parallel to shore until you stop feeling the pull. Even on the beach, be prepared for sneaker waves this weekend and never turn your back on the ocean. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Beach Hazards Statement until 11 PM PDT this evening for CAZ006- 505-509-529-530. Heat Advisory from 10 AM Wednesday to 10 PM PDT Thursday for CAZ006-502>506-508>510-512>518-528>530. PZ...None. && $$ SHORT TERM...Sarment LONG TERM....Sarment AVIATION...RGass MARINE...RGass 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

186 FXUS66 KOTX 080015 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 515 PM PDT Mon Sep 7 2026 .KEY MESSAGES... - Cool and showery weather expected through Monday. - A warming and drying trend returns around the middle of the week. && .SYNOPSIS... Active weather sticks around for Labor Day with cool and showery weather across northeast Washington and north Idaho. A warming and drying trend commences around the middle of the week as higher pressure returns to the region. && .DISCUSSION... Tonight and Tuesday: Low pressure remains over the NW U.S., with the primary center over Montana and a secondary low over the Cascades this afternoon. This will be the primary precipitation producer this period. A deformation axis joining these feature is providing a focal point for moisture and precipitation. The low near the Cascades pivots south and east tonight into early Tuesday, which will pivot that boundary and that moisture south and east while the precipitation start to wane from the west. There could be some embedded t-storms this evening, but the risk is expected to past sunset. The steadier showers this afternoon were found near the northern counties and this will expand south and east. The east third of WA and ID will see the best potential for measurable precipitation, with more isolated to scattered activity near the Cascades, central and southeast WA. By Tuesday morning the primary potential remains over Idaho and the east third of WA. For tonight and Tuesday AM, I did draw the PoPs further west and south than the NBM was showing as it has been under-performing when it comes to the convective showers the past few days. By Tuesday afternoon the low is moving east and mainly isolated showers are forecast around the ID Panhandle mountains. I went a bit above guidance here too in the northwest flow, but for the most part it will be drier. Rain amounts of 0.05 to 0.25 inches possible over northeast WA and the north and central Panhandle, locally up to 0.50 in some of the rising terrain over Idaho from tonight to early Tuesday. The remainder of central and southeast WA and lower ID is generally expected to see less than 0.05 inches of rain, if any. Breezy conditions will subside through this evening, becoming light and variable overnight into Tuesday morning. Lows will be in the 40s to low 50s. Highs will be in the upper 60s to 70s Tuesday. With the recent rain and high pressure starting to nose in, look for some patchy to areas of fog over the northeast WA and ID Panhandle valleys, as well as sine some outlying areas of the Palouse and sheltered areas around the Spokane area later tonight and again Tuesday night into Wednesday AM. Wednesday and Thursday: Weak high pressure builds in with a drier west to northwest flow, while another system starts to drop toward. Skies will be partly to mostly cloudy, with the most cloud cover Wednesday night/early Thursday. Look for drier weather, with warming temperatures. Highs are forecast to be in the 70s to mid-80s, with lows mainly in the 40s and 50s. Winds will be on the increase from the north Wednesday night, especially down the Okanogan Valley. The broader breezy to windy conditions are forecast Thursday with a strong westerly flow and jet sagging across the region. Speeds of 10-20 mph with gusts of 20-25 mph are forecast, with localized gusts near 30 mph around the Waterville Plateau through western Columbia Basin. Elevated fire conditions, blowing dust and choppy waters will be something we will keep an eye toward. Thursday night to Monday: The next low pressure system drops into the region. A weak wave moves across Thursday night into Friday, then a stronger low digs down the coast Friday night into early Saturday before swinging inland Saturday afternoon into Sunday. A few showers are possible around the mountains with the first wave, but better chances expand out Friday night into Saturday, before starting to retreat to the mountains and wane Sunday into Monday. Some moderate rains are possible around the mountain zones Saturday, with lighter amounts elsewhere. Embedded t-storms are possible and may produce locally higher amounts. Saturday is also forecast to be another breezy day. Temperatures cool to the mid-60s and 70s Friday, mostly 60s and localized low 70s Saturday, before moderating into Sunday and Monday. Lows will be mainly in the 50s, but We will have to watch for some mid to upper 30s in some of the sheltered valleys and outlying areas over east WA and ID. /Solveig && .AVIATION... 00Z TAFS: A band of showers is moving west-east through KGEG/KSFF/KCOE. VFR conditions expected as westerly winds advect drier air in the boundary layer across the region for KGEG/KSFF/KCOE/KPUW/KLWS. Continued downslope northwest winds off the Cascades into KEAT/KMWH will allow VFR conditions to continue. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: Moderate to high confidence for VFR conditions for KGEG/KSFF/KCOE. THere is a low probability for MVFR from 09-14Z. ----------------------- 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 49 72 46 77 53 76 / 60 20 0 0 0 0 Coeur d`Alene 50 70 47 76 51 75 / 80 40 0 0 0 10 Pullman 43 70 44 77 48 75 / 20 20 0 0 0 0 Lewiston 49 77 49 83 56 84 / 10 10 0 0 0 0 Colville 43 75 42 79 45 77 / 30 10 0 0 0 10 Sandpoint 45 68 44 73 47 72 / 90 40 0 0 0 10 Kellogg 47 66 45 73 49 71 / 80 50 0 0 0 0 Moses Lake 48 77 48 82 54 82 / 20 10 0 0 0 0 Wenatchee 53 78 56 83 62 80 / 0 10 0 0 0 0 Omak 50 80 51 82 56 80 / 20 10 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...None. ID...None. && $$

174 FXUS66 KPDT 072316 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 416 PM PDT Mon Sep 7 2026 .KEY MESSAGES... - Low chance (<=30 percent) of showers this afternoon and evening mainly over far eastern Oregon. - Breezy winds this afternoon and evening over the Columbia Basin, Cascade Gaps, Kittitas Valley and Simcoe Highlands. - Dry and warmer Tuesday through Thursday, then breezy Thursday in as a weak trough moves through in advance of the next upper low which will bring the potential for more unsettled weather to the mountains over the weekend. && .DISCUSSION... The persistent upper low that had been over the Pacific Northwest has moved eastward out of the region. However, lingering troughing remains and a secondary low/short wave will move though this evening. This short wave energy could touch of some showers and possibly a thunderstorm mainly over far eastern Oregon, though some activity has developed over Washington it has not been long lasting. Breezy conditions are also expected this afternoon through the evening across the Cascade Gaps, Columbia Basin of Oregon, Columbia Gorge, Simcoe Highlands and Kittitas Valley. Winds should gust in the 25 to 30 mph range, with gusts as high as 35 mph. However, the rest of the area will remain dry. By Tuesday, a split flow regime will develop over the area, which will become more westerly by Wednesday. Temperatures will warm to seasonal values for much of the week, after being below normal for the last several days. By the weekend, temperatures return to below normal with the trough moving through. Highs will be mainly in the 70s at that time which is about 10 degrees below normal. The EFI indicate the 60th t0 70th percentile below normal at that time. On Thursday, some short wave energy and a weak trough will move through the flow and increase the winds, and the flow will become more northwesterly. Wind gusts will be in the 25 to 30 mph range, with gusts as high as 35 mph in the same areas as today even going into central Oregon and the foothills of the Blue Mountains. Wind gusts >=25 mph are >=70 percent in these areas. Wind gusts >=39 mph are ars high as 60 to 90 percent across portions of the Columbia Basin and Kittitas Valley and lower elsewhere. The flow returns to westerly again on Friday, then southwest in advance of an upper low that will move across the region Saturday into Sunday, bringing precipitation chances back to the mountains. There is still some uncertainty as to the evolution of the low next weekend, but the system does appear to be progressive, but there will be at least some precipitation in the mountains, an potentially in the lower elevations, but the lower elevation rain chances appear low at this time. && .AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/... VFR conditions with breezy winds in the DLS that will decrease as we go into the later afternoon to early evening hours. Not expecting and CIG or VIS issues through the TAF period. && .Preliminary Point Temps/PoPs... PDT 44 77 46 82 / 0 0 0 0 ALW 51 78 52 83 / 0 0 0 0 PSC 48 80 49 85 / 0 0 0 0 YKM 51 79 52 84 / 0 0 0 0 HRI 47 80 48 85 / 0 0 0 0 ELN 46 77 48 82 / 0 0 0 0 RDM 38 76 41 85 / 0 0 0 0 LGD 43 75 46 83 / 10 0 0 0 GCD 43 77 46 86 / 0 0 0 0 DLS 52 81 55 86 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... WA...None. OR...None. && $$ DISCUSSION...77 AVIATION...95

511 FXUS65 KREV 071904 AFDREV Area Forecast Discussion National Weather Service Reno NV 1204 PM PDT Mon Sep 7 2026 .KEY MESSAGES... * Warmer and drier trend for this week with typical afternoon breezes. * Low shower and thunderstorm chances along the Eastern Sierra on Wednesday. * Breezy conditions arrive Thursday with cooler temperatures trending for the weekend. && .DISCUSSION... Notable weather is absent for the next few days as high pressure induces a warming and drying trend for the Sierra and western Nevada. Daytime highs extend into the 90s for western Nevada by midweek with peak temperatures on Thursday. Sierra communities warm into the mid 80s by Wednesday-Thursday while low chances (10-15%) of showers and storms arise for the Eastern Sierra. Shower potential has trended downward for midweek with the influx of dry southwest flow looking more probable. Ensemble clusters are more in line than yesterday`s. The trough slated to push into the Pacific Northwest drops southward enough to incur some stronger west, southwest flow and breezy to windy conditions for Thursday marching into the weekend. Plan on the start of a cooling trend by Friday into the weekend along with more breezy conditions. -Edan && .AVIATION... Plan on VFR conditions for all terminals through Tuesday. Winds will be lighter today with more typical afternoon wind gusts of 10-15 kts for area terminals 21-22z Monday through 03-04z Tuesday. KMMH may see higher gusts of 20-25 kts this afternoon. -Edan && .REV Watches/Warnings/Advisories... NV...None. CA...None. && $$

812 FXUS66 KSTO 071919 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1219 PM PDT Mon Sep 7 2026 For additional details on weather and expected impacts over the next 7 days, please visit weather.gov/sto/briefing. .KEY MESSAGES... - Drying and warming trend through Thursday, with areas of Moderate to Major HeatRisk Wednesday and Thursday. - Heat Advisory is in effect 10 am Wednesday - 10 pm Thursday for the Delta, Valley, and foothills. - Cooling temperatures and breezy onshore winds Friday into the weekend. && .DISCUSSION... Today-Thursday: While troughing aloft over the PacNW remains the primary driving feature of the weather pattern today, ridging aloft is beginning to build westward from the Desert Southwest. As the building ridge and increasing heights aloft push toward interior NorCal through the middle of the week, above normal temperatures and areas of Moderate to Major HeatRisk look to briefly return to the region. High temperatures in the upper 90s to lower triple digits accompanied by warm overnight temperatures in the mid 60s to 70s are anticipated across much of the Delta, Valley, and foothills on Wednesday and Thursday. As a result, a Heat Advisory is in effect from 10 am PDT Wednesday - 10 pm PDT Thursday for these locations. Accompanying this warm up will be periodically breezy and drying north to east winds, with daytime humidity into the teens and poor to limited overnight humidity recovery. Resultant elevated fire weather conditions are expected through Thursday. Friday Into The Weekend... Ridging and high heights aloft will begin relaxing by late Thursday as a longwave trough starts to drop down from interior British Columbia. This is expected to lead to an abrupt cool down to more seasonable high temperatures by Friday with a trend toward slightly below normal temperatures through the weekend and into early next week. Breezy onshore winds look to return as well with the pattern shift introducing some improvements to daytime humidity and overnight recoveries. There is then some uncertainty regarding the eventual track of the trough as it ejects out of British Columbia late weekend and into early next week. While precipitation impacts are generally not anticipated given the dry nature of the system and antecedent air mass, there is potential for breezy to gusty north winds to develop across interior NorCal dependent on the trough trajectory. && .AVIATION... VFR conditions prevail at TAF sites across the forecast period. Breezy north to east winds are expected at times, although remaining 12 kts or less, with strongest winds through the Valley and Delta in the late morning and afternoon hours. && .STO WATCHES/WARNINGS/ADVISORIES... Heat Advisory from 10 AM Wednesday to 10 PM PDT Thursday for Butte County Below 1000 ft-C. San Joaquin County including Stockton-C. Solano County including Fairfield-C. Stanislaus County including Modesto-C. Yolo/NE Solano including Woodland- Central Colusa County Incl. I-5-Central Glenn Co & Interstate 5- Central Motherlode 1000-3000 ft-E. Diablo Range Above 1000 ft- Eastern Colusa County-Eastern Glenn County-N. Motherlode 1000- 3000 ft-N. Sac Valley in Tehama County-NE San Joaquin Valley Below 1000 ft-SW Solano County including Vallejo-Sac Metro/W. El Dorado/Amador County-Sacramento County Delta-San Joaquin County Delta-Sierra (Tehama-Plumas) 1000-3000 ft-Southern Motherlode 1000-3000 ft-Sutter/Yuba counties below 1000 ft-Tracy Triangle Below 1000 ft-W. Stanislaus County Above 1000 ft & I-5-W. Yolo County including Capay/I-505-Yolo / Solano County Hills. && $$

561 FXUS65 KMSO 071955 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 155 PM MDT Mon Sep 7 2026 .DISCUSSION... KEY MESSAGES: - Significant rain event will continue for northwest Montana throughout the day on Tuesday. - Gradual drying trend develops mid-week alongside morning valley fog and chilly mornings. Chance of frost for high valleys of southwest Montana Tuesday and Wednesday mornings. - 30 to 40 percent chance for another wet and even colder system next weekend with high elevation snow along the Continental Divide The low pressure system that has brought widespread precipitation to north central Idaho and western Montana has shifted into north central Montana this afternoon. With this progression of the low, the steady moderate to heavy rainfall has shifted northwards and is now generally occurring across northwest Montana (north of Highway 200). Localized one hour precipitation rates of 0.3 to 0.4 inches have been observed and will continue to be possible into this evening. Flood watches remain in effect for portions of northwest Montana as an additional 1 to 2 inches is anticipated through mid day Tuesday. Minor flooding in poor drainage areas, ponding water on roadways and rock/debris on roadways is a concern, along with rapidly rising small streams and creeks. South of Highway 200, precipitation will be more showery in nature through this evening before decreasing after sunset. Showers will be capable of brief heavy rain, but this activity is not anticipated to be widespread. Locations across southwest Montana may see enough clearing tonight to allow temperatures to drop into the mid 30s, possibly allowing for some frost development. Elsewhere, cloud cover should limit overnight cooling. A drying trend comes into play late Tuesday into Wednesday. Seasonable temperatures in the mid 70s for many valley locations are anticipated. Chilly mornings and even some fog will feel very fall like to end the week. Beginning on Thursday, winds will increase from the west as zonal (westerly) flow develops ahead of the next approaching weather system. This could cause some increased chop on local lakes as well as possibly enhancing fire weather concerns across far southwest Montana, which has largely been missed by the recent precipitation event. Forecast models still differ on how the next upper level trough will evolve over the Northern Rockies by next weekend. A trend to cooler and showery weather looks likely no matter the scenario. However, 30 to 40 percent are beginning to show a cold and wet low pressure system over the region. If this were to occur, another round of widespread precipitation and even high elevation snow could be a possibility. && .AVIATION...Rain will continue at KGPI and the Northern Rockies airspace north of about Interstate 90 tonight. Expect decreased visibility and lowered ceilings to about MVFR or IFR due to rain, mist, and possibly some early morning fog across northwest Montana. Precipitation will also obscure terrain over all mountain ranges of northwest and west-central Montana. South of about I-90, the biggest impact to aviation will be increased west or southwesterly winds to about 15-20 knots. Patchy fog may form at terminals that received rain today and tonight. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...Flood Watch through Tuesday morning for Flathead/Mission Valleys...Potomac/Seeley Lake Region...West Glacier Region. ID...None. && $$

122 FXUS65 KBOI 072330 AFDBOI Area Forecast Discussion National Weather Service Boise ID 530 PM MDT Mon Sep 7 2026 .UPDATE...Updated aviation discussion. && .KEY MESSAGES... - Breezy and cooler today, with showers continuing in the north, but becoming sunny in the south. - Warmer and drier Tuesday through Thursday. - Cooling, breezy weather, Friday through Sunday, with showers possible in northern areas Saturday. && .SHORT TERM /Through Wednesday Night/... Issued 217 PM MDT MON SEP 7 2026 Upper level trough continues to move northeast out of the area with lingering clouds over the mountains this afternoon. Scattered showers and isolated thunderstorms are forecast late this afternoon and evening near the Wallowa mountains and mountains north of McCall. Otherwise conditions dry out on Tuesday as the cold core upper level trough moves away and a warming trend ensues. && .LONG TERM /Thursday through Monday/... Issued 217 PM MDT MON SEP 7 2026 As high pressure continues to linger over the area, Thursday will still see warmer than normal temperatures. Later Thursday, a shortwave trough ahead of a large Pacific trough off the coast of British Columbia will dig across our area. This shortwave will return precipitation chances, mainly over the northernmost mountain portions of the CWA. The cold front associated with this trough will bring gusty winds from the west and a cooldown to normal or slightly below normal temperatures Friday through Saturday. Come late Saturday, the larger parent trough is projected to steer inland and over our area as a closed upper low, continuing a cooling trend and breezy west winds. For now, long- range guidance mainly favors widespread precipitation over the northern half of our CWA Saturday through Sunday. Monday will be dry, breezy, and cool as the upper low steers out east. && .AVIATION /00Z Tuesday through Wednesday/... Issued 514 PM MDT MON SEP 7 2026 VFR with SCT-BKN cumulus over high terrain this evening, then clearing tonight. Isolated weak showers near KBKE-KMYL through evening. Patchy mountain-valley stratus overnight. Surface winds: becoming variable up to 10 kt this evening. Winds aloft at 10kft MSL: W-SW 10-20 kt. KBOI...VFR, clearing tonight. Surface winds: generally NW around 6 kt through evening, then variable or SE around 5 kt overnight. && .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.....SH SHORT TERM...KA LONG TERM....JY

637 FXUS65 KLKN 071945 AFDLKN Area Forecast Discussion National Weather Service Elko NV 1245 PM PDT Mon Sep 7 2026 .KEY MESSAGES... * Cool tonight with near freezing temperatures in the coldest valleys * Warming trend begins Tuesday * Dry conditions are expected through late week && .DISCUSSION... (This evening through next Sunday) WEATHER PATTERN OVERVIEW: Current satellite imagery shows clear skies and calm conditions. This is expected to continue through the work week as an exiting trough leaves zonal flow behind it. A warming trend is also expected with this pattern change, with highs climbing from the mid 70s today to the upper 80s by Thursday. Overnight lows will also be at their coldest tonight with lows in the upper 30s and 40s, although a few of the coldest valleys may approach freezing. Widespread frost is not expected but those in the usual colder locations may wish to protect any remaining outdoor plants. After tonight lows in the 30s are not expected until potentially this weekend. Models currently show a strong upper level low swinging southeast into the Pacific Northwest for Saturday and Sunday. Potential impacts from this system are currently expected to be colder temperatures and increased cloud cover. FORECAST CONFIDENCE & DEVIATIONS: High confidence in cool temperatures through tomorrow and a warming trend through late week. Low confidence in the weekend weather system. No changes to NBM output. && .AVIATION...VFR conditions and winds under 10KT expected at all sites through the next 24 hours. && .FIRE WEATHER...No critical fire weather expected over the next several days. Temperatures are expected to increase and humidity to decrease but winds stay below about 20 mph. No storms are expected. && .LKN Watches/Warnings/Advisories... None. && $$ DISCUSSION...94 AVIATION...94 FIRE WEATHER...94