328 FXUS66 KSEW 051742 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 1042 AM PDT Sun Apr 5 2026 .SYNOPSIS... Upper level ridge over Western Washington today weakening Monday. Upper level trough moving by to the north Monday night into Tuesday inducing a marine push Monday night. Upper level ridge well offshore with upper level low off the Northern California coast giving the area dry northwesterly flow aloft wednesday through Friday. Upper level trough moving down from the north approaching the area next weekend. && .SHORT TERM /TODAY THROUGH TUESDAY/... pper level ridge over the area today. Southwesterly flow aloft will keep high clouds moving through Western Washington. Low level flow offshore. This will push high temperatures into the 60s and lower 70s. Upper level ridge remaining in place tonight into Monday with the ridge weakening Monday. Low level offshore flow weakening overnight with light low level flow Monday becoming onshore in the afternoon. With ocean water temperatures between 50 and 52 degrees this switch to onshore winds will cool the coast down into the mid to upper 50s. Highs over the interior remaining in the 60s and lower 70s. Lows tonight with the high cloud cover in the 40s. Classic marine push scenario Monday night with an upper level trough moving by to the north inducing an increase in low level onshore flow. Breezy conditions near the Strait of Juan de Fuca into Whidbey Island as well as along the coast into the Lower Chehalis Valley. Increasing clouds Monday night into Tuesday morning. Onshore gradients weakening Tuesday afternoon with sunshine returning to the area. Lows in the mid 30s to mid 40s. Highs Tuesday much cooler, in the lower to mid 50s. Felton && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... Extended models showing good run to run consistency through Friday. Upper level ridge well offshore combining with a stationary upper level low off Northern California giving Western Washington dry northwesterly flow aloft. Another round of frost advisories is possible for the Southwest Interior and Lower Chehalis Valley in the morning hours both Wednesday and Thursday. Lows in the 30s and lower 40s. Highs in the mid 50s to lower 60s. Model consistency falls apart Saturday with the GFS bringing an upper level trough down from the north while the ECMWF cuts the trough off well north of the area. Ensembles not real excited about the trough scenario but enough solutions with light precipitation to include a chance of showers Saturday. Lows in the upper 30s to mid 40s. Highs remaining in the mid 50s to lower 60s. && .AVIATION... High pressure remains in place over the region, shifting eastward and weakening through Monday as the next disturbance begins to approach. This will maintain VFR conditions area-wide with variable high cirrus across the region. Northerly winds continue across the region today. Expect VFR conditions across the interior through the period (with perhaps a few patches of low clouds around the most prone locations), but IFR ceilings/visibility return to the coastal terminals after 12z Monday. A wind reversal will maintain little improvement through the day Monday for the coast. Southerly winds increasing late Monday morning across the area, with stronger west winds through the Strait likely inducing a Puget Sound Convergence Zone Monday night as onshore flow increases. KSEA...VFR is expected through much of Monday with only passing high cirrus. Northerly surface winds continue above 7-10 kt through evening, easing after 02-03z. Winds becoming light/variable overnight, but becoming predominantly southerly Monday morning. A possible PSCZ develops late Monday north of the terminal area with increasing southerly winds. Cullen && .MARINE... Broad high pressure remains in place across the area through Monday with a weak thermal trough build up along the west coast, keeping winds northerly. Winds will increase Monday evening as a front passes by to the north and stronger high pressure builds in behind it. Small Craft Advisory winds are expected across the northern sections of the coastal waters, as well as down the Strait of Juan de Fuca and into Admiralty Inlet. Winds will continue to turn down into the Puget Sound, though there is less confidence that Small Craft winds make it down there. There remains the potential for gales (30-50% probability) through the Strait of Juan de Fuca, with occasional gale gusts more likely. Will continue to evaluate a potential upgrade, but the current headline still stands at this time. Winds will slowly ease on Tuesday and remain relatively light through the rest of the week as high pressure remains in place over the northeast Pacific. Seas remain 3 to 6 ft through Monday. Seas will then build up to 8 to 11 ft Monday night into Tuesday, and these waves will be steep with dominant periods of around 8 to 9 seconds. The highest waves are also likely to be in the northern portions of the outer waters during this time. Seas look to remain in the 5 to 8 ft range through the rest of the week. 62 && .HYDROLOGY... No river flooding the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory from 2 PM Monday to 2 PM PDT Tuesday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From James Island To Point Grenville Out 10 Nm-West Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from 11 AM Monday to 5 AM PDT Tuesday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from 5 PM Monday to 5 AM PDT Tuesday for Admiralty Inlet. && $$

829 FXUS66 KPQR 051956 AFDPQR Area Forecast Discussion National Weather Service Portland OR 1256 PM PDT Sun Apr 5 2026 .SYNOPSIS...Dry conditions will persist through Friday aside from a chance of showers over the Oregon Cascades Wednesday through Friday. High pressure will maintain well above normal temperatures for this time of year through Monday. Onshore flow returns Tuesday and Wednesday, bringing relatively cooler temperatures. Trending a bit warmer again Thursday into Friday with light offshore flow developing. Shower chances return to most of NW OR and SW WA on Saturday. && .DISCUSSION...Sunday through Saturday night...Satellite imagery early Sunday afternoon shows a thin layer of high clouds moving over NW OR and SW WA as high pressure and low-level offshore flow remains in place. Easterly winds remain a bit breezy through the western Columbia River Gorge into the Troutdale, Washougal, and Camas areas with gusts up to 15-25 mph. Expect easterly winds to ease late in the day as low-level offshore flow weakens. Despite the high clouds in place today, temperatures are still on track to warm well into the mid to upper 70s across the interior lowlands and upper 60s to lower 70s at the coast. As of noon, many locations have already passed the 70 degrees mark. Most locations within the Willamette Valley and greater Portland/Vancouver metro have anywhere from a 10-30% chance of reaching 80 degrees or warmer this afternoon. Although high pressure weakens a bit tomorrow with 850 mb temperatures cooling slightly, high clouds will be dissipating. Given a full day of sun, Monday is on track to be just as warm as Sunday with similar probabilities of reaching 80 degrees. The only exception is at the coast where the return of onshore flow will bring relatively cooler temperatures compared to Sunday with highs near 60 degrees. A few record high temperatures may be tied or broken both today and Monday. It is not recommended to cool off in local lakes and rivers as water temperatures are currently frigid enough to result in cold water shock, which can become life threatening. A weak and dry cold front associated with a low pressure system moving east through British Columbia is slated to move over the region late Monday into Tuesday. Ahead of this, models are showing upper level flow shifts westerly and a very subtle upper shortwave associated with the front could cause enough orographic lift for a 15-20% of isolated showers over the southern Lane County Cascades Monday afternoon. However, better chances will be east of the Cascade crest. Temperatures then trend cooler Tuesday and Wednesday behind the front with dry northwest flow aloft and relatively stronger low-level onshore flow. The NBM depicts low model spread for temperatures both days, suggesting high temperatures will likely wind up in the low to mid 60s, except 55-60 degrees at the coast. Mostly dry weather will persist through Friday except for over the Oregon Cascades south of Clackamas County. Ensemble guidance indicates the potential for wrap-around moisture from the south associated with a low pressure system spinning off of the northern California coast. This moisture could move far enough north to produce shower chances each day, mainly in the late morning through early evening hours. Potential frost chances are now mainly limited to Wednesday morning. Probabilities for low temperatures of 36 degrees or colder range between 10-25% over the interior lowlands and inland coastal communities, except 1-5% in the Portland metro to the east of the West Hills, and 50-80% in the Upper Hood River Valley from Odell to Parkdale. Anyone with sensitive outdoor vegetation that is susceptible to frost damage should stay up- to-date on the temperature forecast over the coming days and monitor for potential Frost Advisories. Model guidance continues the brief warming trend Thursday through Friday due to potential shortwave ridging on the northeast periphery of the aforementioned upper low. As such, the deterministic NBM is suggesting highs in the upper 60s to low 70s over the interior lowlands both days. NBM indicates a 40-60% chance of high temperatures of 70 degrees or higher each day, except for a 65-80% chance for the Portland metro area. This weak ridging is the main reason frost chances are decreasing for Thursday and Friday mornings as it will also cause slightly warmer overnight temperatures, generally in the 40s. By next Saturday, the 500 mb cluster analysis of the GEFS, EPS, and GEPS indicates two potential solutions in the pattern with about a 50/50 chance for each. One solution keeps the pattern similar to Thursday and Friday except with a weak trough approaching the West Coast from the Pacific. This solution keeps the area mostly dry with shower chances in the Cascades, though temperatures are more likely to begin cooling towards normal with the approach of a trough. The other solution suggests a deeper trough impacting the PacNW and bringing increased rain chances across the entire region sometime on Saturday. This uncertainty has resulted in a 20-35% chance of rain showers west of the Cascades and a 35-60% chance over the Cascades. Even if showers do return Saturday, guidance suggests rain amounts will be light with an 80-90% chance total rain amounts will be less than 0.25 inch west of the Cascades and a 50-70% chance over the Cascades. -03/23 && .AVIATION...Widespread VFR flight conditions continue across the majority of the airspace through Sunday night with scattered to broken high clouds above FL250. Breezy easterly winds continue at KTTD with gusts up to 25 kt, but should weaken around 03Z-06Z Monday. Otherwise, winds remain variable less than 10 kt. A southerly wind reversal along the coast will bring a surge of clouds to coastal locations after 06Z Monday. Expect IFR/LIFR conditions along the coast starting at KONP around 07Z Monday and at KAST around 10Z Monday. Given the persistent southerly winds expected, minimal if any improvement along the coast is expected from through 18Z Monday. KPDX AND APPROACHES...Expect VFR flight conditions to continue with scattered to broken high clouds above FL250. Variable winds less than 10 kt. /42 && .MARINE...The high pressure system, which has been driving the current conditions across all waters will starts to weaken this evening. As it weakens, this will result in a southerly wind shift across all waters as well as a surge of marine stratus along the coast. This pattern change is expected to be relatively short lived as the aforementioned the upper level high becomes displaced by a pair of lows, that are moving south and east through the fist part of the week. This will bring a return of northerly winds by Monday afternoon and these northerly winds are expected to persist through the remainder of the week. Seas throughout the majority of the week will remain around 4 to 7 feet with a persistent westerly swell. Seas are expected to build slightly towards 7 to 9 ft towards the very end of the week in response to a fresh northwesterly swell that will impact the waters. This could (30-50% chance) result in another round of marginal Small Craft Advisory conditions. /42 && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...None. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

162 FXUS66 KMFR 051935 AFDMFR Area Forecast Discussion National Weather Service Medford OR 1235 PM PDT Sun Apr 5 2026 .DISCUSSION... High clouds continue to move through the region this afternoon. However, plenty of sun is still filtering through those higher clouds and we`re anticipated to warm up into the lower 70`s again today. A thermal trough is along the Cascades and that trough will retreat farther to the east during the afternoon hours. Overall, not much going on except for the above normal temperatures today. The flow pattern will become more onshore by tomorrow, although temperatures will remain warm in the valleys with more upper 70`s west of the Cascades and lower 70`s east of the Cascades. The very low(10-20%) chance of thunderstorms persist on Monday. Looking at soundings the amount of convective available potential energy(CAPE) is low and only 100-200 J/kg. The SPC HREF calibrated thunder algorithm is going with a 10-20% chance, so felt that was fair. Don`t be surprised if nothing happens and we just get some showers along and east of the Cascades Monday afternoon and evening. By Tuesday morning, an upper level trough in Canada starts to dig down into Washington and Idaho with a cut off low off the coast of northern California. In addition, a cold front should be moving south during the day as well. This front stalls out over Central Oregon during the day with highs in the mid 70`s in southern Oregon and mid 60`s farther north of Eugene and Bend. The forecast has also trended drier compared to yesterday with a 5-10% chance of rain during the day. It seems 500 mb heights are amplifying ahead of the cut off low, so that cuts off moisture and enhances the sinking motion. As that deeper trough digs further into the CONUS, the cutoff low remains off our coast by Wednesday. The chance of rain is about 20 to 30 percent over our forecast area, although that could very well trend lower depending on how this upper level low behaves. Most ensemble members also seem to be targeting northern California, so the probability for precipitation is higher there compared to parts of Oregon. This cutoff low begins to travel south along the California coastline with some strong 500 mb divergence over our forecast area on Thursday. This should result in showers and perhaps more thunderstorms depending on CAPE. However, the PoP forecast suggests a wet day with a 50-60% chance of rain Thursday morning and afternoon. The extended forecast is looking wet around Friday into next week with the vast majority of ensemble members with precipitation in the forecast. -Smith && .AVIATION...05/18Z TAFs...VFR conditions will persist through the TAF period for most the area. LIFR ceilings are possible along the coast(KOTH) later tonight as some weak onshore flow develops. -Smith && .MARINE...Updated 1200 PM PDT Sunday, April 5, 2026...Relatively calm conditions are expected through this week. Another thermal trough develops around Tuesday afternoon, bringing a period of strong north winds and steep seas starting around Tuesday afternoon and potentially for most of the week. && .MFR WATCHES/WARNINGS/ADVISORIES... OR...None. CA...None. PACIFIC COASTAL WATERS...None. && $$

238 FXUS66 KEKA 050759 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1259 AM PDT Sun Apr 5 2026 .SYNOPSIS...Much warmer and drier than normal conditions will continue to peak Sunday, Conditions will slowly ease early next week with rain potential mid week. && .KEY MESSAGES... -Interior highs in the low 80s today with minor HeatRisk. -Chance (50%) of wetting rain showers mid next week. && .DISCUSSION...A ridge of high pressure will continue to peak today. On Saturday, the warmest interior valleys managed to reach up to 83 with very dry RH. Clear skies arched all across the area. Weak wind and clear skies even helped conditions near the coast get close to 70. Near identical conditions will continue Sunday. There is high confidence that high pressure will gradually weaken by early next week with a low pressure system moving in along shore. This will bring still much above average, but slightly cooler conditions, especially at the coast where marine influence will resurges. The path, strength, and moisture associated with this low remains highly variable. Overall rain chances have decreased slightly around Wednesday but increased later in the week. Most model ensemble members show a trough far north of the area mid week with a cutoff lie meandering along the central coast. This setup provided high uncertainty, but would be conducive to moisture pulling up the central alley and generating week storms and showers. Overall chance of wetting rain remains around 50% with chance of 0.5 inches now near 5%. Regardless for rain amount , gusty north winds will build behind any rain late next week. /JHW && .AVIATION...Prevailing VFR conditions with high clouds is expected for all TAF sites through the period. Light and variable winds, becoming W at 5-10 kts in the afternoon. HREF model suggest a shallow marine layer developing across the coastal waters and pushing onshore Sunday night into Monday, with the potential of IFR/LIFR ceilings Monday morning for the coastal terminals. /ZVS && .MARINE...Relatively calm conditions are expected to persist through Tuesday, with light and variable winds and low seas below 5 feet. Northerlies will begin to increase Tuesday night in the wake of a weak cold front, with moderate to strong breezes possible by mid-to-late week. However, there is a high uncertainty regarding the strength of the northerly winds as a positively tilted cut-off low approaches the area from the west before tracking southward. Latest GFS and ECMWF ensembles suggest generally light to gentle breezes persisting across the waters through mid-week, with moderate to strong breezes over the outer waters late in the work week. /ZVS && .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

390 FXUS66 KMTR 051955 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1255 PM PDT Sun Apr 5 2026 ...New SHORT TERM, LONG TERM... .KEY MESSAGES... Updated at 1253 PM PDT Sun Apr 5 2026 - Above normal temperatures continue today; cooling trend begins tomorrow - Beneficial rain and a low potential for thunderstorms mid to late week && .SHORT TERM... Issued at 1253 PM PDT Sun Apr 5 2026 (This evening through Monday) Another warm day is on the books for today. Temperatures are running around 15 to 20 degrees above normal across the interior and around 10 to 15 degrees above normal along the coast. Highs today will largely be in the 80s across the interior and 70s along the coastline. The pattern shifts quite notably heading into Monday as upper level ridging exits eastward and weak shortwave upper level troughing moves in. This will allow the marine layer to develop (albeit a shallow one between 1000-1500 ft) and we will see a "southerly surge" of stratus along the coast. If you live along the coast, tomorrow morning will feel very different than today due to the much cooler temperatures and low level stratus. There may even be some potential for coastal drizzle early Monday morning. Offshore winds are expected to become onshore again this afternoon/evening with onshore winds to then prevail through the remainder of the forecast. Temperatures cool much more noticeably on Monday with interior highs dropping into the low to mid 70s and coastal highs into the upper 50s to low 60s. Interior temperatures will still be running a few degrees above normal while coastal temperatures are fairly seasonal. && .LONG TERM... Issued at 1253 PM PDT Sun Apr 5 2026 (Monday night through next Saturday) Cooler, wetter weather remains on track to arrive mid to late week as our next system arrives. Upper level ridging tries to rebuild on Tuesday, but, remains compressed due to a deep upper level low moving into the PNW. This results in Tuesday`s forecast staying rather similar to Monday`s with interior highs in the 70s and coastal highs in the 50s to 60s. By Wednesday, we start to see our next rainmaker on the horizon. The upper level trough over the PNW will exit eastwards into the Central United States with a second low pressure system approaching California from the west. This system has some characteristics of a cut-off low with cluster guidance starting to come into better agreement about it. The upper level low looks to move southwards parallel to California`s coastline before moving inland over Baja California. This upper level low originates from the Gulf of Alaska and is bringing down a much cooler airmass. As the cooler airmass arrives, it will bring a return of more seasonal temperatures in the 60s to 70s across the entire region. Originally rain looked likely to return on Wednesday but guidance has shifted with the bulk of the rain now returning Thursday and Friday. Current guidance suggests rain showers will be fairly widespread across our CWA but they will be more showery than stratiform (uniform over a large area) in nature. Ensemble guidance has trended upwards recently in terms of how much precipitation we are expected. Overall the rain is still classified as light and beneficial but we can expected between 0.5-0.75" across the coastal mountains and Santa Clara Hills while the lower elevations see around 0.25-0.35". The highest amounts look to be farther south over the Central Coast in the Santa Cruz Mountains and the Santa Lucia Range. Locally breezy onshore winds are expected across the higher elevations and mountain gaps/passes but these are expected to stay well below Wind Advisory criteria. As mentioned yesterday, there is a non-zero chance of thunderstorms across much of the area Thursday and Friday. The probability of thunderstorms has increased across the region with a 15-20% chance of thunderstorms on Thursday and Friday. In terms of support, low level lapse rates are decent (7-8 C/km) with several hundred joules of low level MUCAPE but low level shear is fairly negligible. Our thunderstorm chances and rain totals will largely depend on where the surface low pressure system moves inland and how progressive the upper level system is. If the surface low maintains its current path and moves into the Bay Area, thunderstorms will be more likely south of the North Bay and across the Central Coast. Comparatively, if it shifts more southerly (i.e. moving in over SLO), our thunderstorm chances would largely go away. Given the increase in forecast precipitation totals, dry lightning concerns with this system have largely abated. The majority of locations are now expected to see wetting rains (precipitation totals greater than or equal to 0.1") which alleviates the risk of fires started by lightning. All in all, there is some potential for thunderstorms with this upcoming system but confidence is not quite there yet. Make sure to stay up to date as we continue to narrow in precipitation totals and the potential for thunderstorms. && .AVIATION... (18Z TAFS) Issued at 1042 AM PDT Sun Apr 5 2026 VFR conditions continue through the day before a significant pattern change brings a marine layer filled with stratus and possible fog back to the coastal terminals Monday morning. Vicinity of SFO...VFR conditions prevail under high clouds. Winds will shift to onshore by early afternoon and remain their through the remainder of the TAF period. A marine layer is very likely to reform overnight, with MVFR-IFR impacts likely Monday morning. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...VFR conditions today, but these southern terminals have the best chance for marine layer impacts early Monday morning. The ceiling height remains a little uncertain, but MVFR or worse impacts are likely at both MRY and SNS and there is a slight chance for fog. && .MARINE... (Today through Friday) Issued at 1042 AM PDT Sun Apr 5 2026 High pressure to the north will maintain light to moderate breezes over the coastal waters through early next week. Locally stronger winds will develop near the Big Sur Coast early to midweek. Unsettled weather returns the middle of next thanks to a low pressure system over the Pacific. The low pressure will bring fresh gusts across the northern waters and moderate seas next weekend. Light showers and a slight chance of thunderstorms prevails over the coastal waters mid to late week. && .CLIMATE... Issued at 110 PM PDT Fri Apr 3 2026 The following are the record high temperatures at the long term stations for April 5th. Location April 5th Santa Rosa 90 in 1939 Kentfield 88 in 1924 San Rafael 87 in 1957 Napa 86 in 1989, 1957 Richmond 83 in 1989 Livermore 84 in 1989, 1916 San Francisco 88 in 1989 SFO Airport 84 in 1989 Redwood City 87 in 1989 Half Moon Bay 74 in 2016 Oakland Museum 85 in 1989 San Jose 89 in 1989 Salinas Airport 95 in 1989 && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory from 3 PM Monday to 3 AM PDT Tuesday for Pt Pinos to Pt Piedras Blancas 0-10 nm. && $$ SHORT TERM...Kennedy LONG TERM....Kennedy AVIATION...Flynn MARINE...Kennedy 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

476 FXUS66 KOTX 051736 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 1036 AM PDT Sun Apr 5 2026 .KEY MESSAGES... - Warmer and dry early this week. - Gusty winds and dry conditions Tuesday. Elevated grass fire potential in the late morning and afternoon Tuesday. && .SYNOPSIS... Warm and dry conditions will continue through Monday. Temperatures will warm above normal with highs in the upper 60s to the low 70s into Monday. Temperatures cool back to near normal Tuesday with a dry cold front passage. The Inland Northwest looks to be unseasonably dry through the next week. && .DISCUSSION... Today through Monday: A ridge of high pressure will continue to strength over the area. This will bring dry, warm weather. Higher clouds, however, will spread across the area leading to some partly sunny to mostly conditons just for those high clouds. Highs will in the upper 60s and 70s today and 70s and low 80s Monday. Overnight lows will be in the upper 30s and low 40s. The ridge begins breakdown Monday with a trough approaching from Canada. This will start to bring in breezy/gusty winds Monday afternoon into Monday night. Gusts in the 15-25 mph are forecast, strongest near the Cascades/central WA. Tuesday: The trough will push a strong dry cold front through the area. Ahead of the front early in the day, precipitable water values are around 130-140 percent of normal. The primary precipitaiton chances will be over the Cascades and northern mountains and that will be light. As we head into the later morning and afternoon, the drier air pushes in with PWATs dropping to 45-75% of normal. The front and mixing with it will provide gusty winds. Guidance shows sustained winds in the 15-30 mph range, with gusts between 30-40 mph, locally near 50 around the Blue Mountains. The strongest are forecast around the Okanogan Valley (especially early) and also around the Columbia Basin and Palouse into the Blues. The dry, breezy conditions lead to some early season fire concerns for dry grasses and shrubs in the Basin. Tuesday`s highs will be about 10-15 degrees cooler than Monday, reaching the 50s to mid-60s. Wednesday to Saturday: High pressure will build off the Pacific Northwest coast and bring another period of dry weather until perhaps later Saturday into Sunday. Ensembles continue to show a less the 10 percent chance of precip through Friday. Then heading into Saturday (and next Sunday) the ridge is forecast to break as Gulf of Alaska Low drops in. This will increase precip chances, with the best risk around the mountain zones, expanding out more across the eastern third of WA Saturday night (into next Sunday). Highs will be in the mid 50s to low 60s Wednesday, warming into the 60s and low 70s by Friday. Lows will be in the 30s and low 40s. /Solveig && .AVIATION... 18Z TAFS: VFR conditions expected with broken high clouds. A few fair weather cumulus possible near the mountains in the afternoon. Winds generally light and diurnal. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence in VFR conditions. ----------------------- 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 68 44 71 44 55 33 / 0 0 0 0 0 0 Coeur d`Alene 67 44 69 45 55 33 / 0 0 0 0 0 0 Pullman 67 46 68 46 55 33 / 0 0 0 0 0 0 Lewiston 70 48 72 49 63 37 / 0 0 0 0 0 0 Colville 71 41 74 41 57 31 / 0 0 0 10 10 0 Sandpoint 64 42 67 44 52 31 / 0 0 0 10 20 0 Kellogg 66 45 68 46 52 34 / 0 0 0 0 20 0 Moses Lake 75 44 78 45 62 34 / 0 0 0 0 0 0 Wenatchee 71 49 77 44 58 36 / 0 0 0 0 0 0 Omak 72 46 77 42 61 34 / 0 0 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...None. ID...None. && $$

127 FXUS66 KPDT 051722 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1022 AM PDT Sun Apr 5 2026 .KEY MESSAGES... - Above-normal temperatures through Monday. - Low (5-15 percent) chance of thunderstorms Monday. - Widespread breezy to windy conditions Monday night through Tuesday. && .DISCUSSION... An upper-level ridge is in place over the Pacific Northwest early this morning, though broken high cloud is evident on satellite imagery as a weak shortwave approaches from the southwest. Ensemble NWP guidance is in excellent agreement that the ridge axis will continue to shift overhead today, resulting in very high confidence (95 percent) that temperatures will remain above normal. From a deterministic standpoint, widespread afternoon high temperatures in the 70s, and isolated lower 80s, are advertised by the NBM today and Monday. Glancing at probabilistic output, there is a high (70-95 percent) chance the eastern Columbia River Gorge, Yakima Valley, lower Columbia Basin, and lower elevations of north-central and central Oregon will reach 80 degrees Monday. Dry conditions are expected (95 percent confidence) under the ridge today, but guidance is showing low (10-20 percent) chances of showers and very low (5-15 percent) chances of thunderstorms Monday as a weak shortwave wriggles into the Pacific Northwest from the Pacific and a closed low and attendant cold front slide southeast into British Columbia and northwest Washington. CAMs are showing a weakly unstable atmosphere (MUCAPE/SBCAPE 250-500 J/kg) over the mountains, primarily the Blues, but also portions of the Cascades of both Oregon and Washington. Thunderstorms, if any, will be of the air mass variety due to weak shear (15-25 kts effective) and slow storm motion of 5-10 kts to the east or east-southeast is anticipated. Gusty outflow appears to be the primary hazard with this convection, and CAMs are outputting up to 35 kts with the most robust cells. Forecast soundings suggest DCAPE of 500-800 J/kg which would support these sub-severe outflow winds. By Tuesday, ensemble guidance generally depicts a closed low in the Pacific approaching the OR/CA coast while the aforementioned closed low treks across the Northern Tier. The trend in guidance has been farther north and east with the low from Canada, resulting in forecast temperatures that are near to above normal Tuesday and Wednesday. Winds Monday night and Tuesday are still the best chance of a headline-worthy event for the next week. The NBM suggests a low- medium (30-60 percent) chance of reaching or exceeding advisory-level wind gusts (45 mph or greater) through the Cascade gaps and across wind-prone portions of the Columbia Basin and surrounding lowlands. Looking ahead, there is significant uncertainty in the evolution of the 500-hPa pattern Wednesday through the remainder of the week as ensemble guidance struggles to resolve the track of the offshore cut-off low in the Pacific. Latest 00Z runs have trended less progressive and ensemble means keep the closed low in the vicinity of the OR/CA border or northern/central California Wednesday through Friday. The trend towards a split flow pattern has resulted in an upward trend in forecast temperatures and would keep above-normal temperatures in place for the duration of the week. Delving into some analysis of uncertainty in the 500-hPa pattern, ensemble cluster analysis shows roughly 30-40 percent of members keep the closed low in a position that is favorable for shower and thunderstorm development for a small portion of our CWA across central and eastern Oregon Wednesday through Friday, but the bulk of the activity would remain in south- central Oregon and northern California. The remainder of the ensemble members are still advertising a more progressive pattern with the low diving southeast into California sooner and/or place the low farther south. 86 && .AVIATION /18Z TAFS THROUGH 18Z MONDAY/...VFR conditions to prevail through the period. Winds 12kts or less will be diurnally driven. An occasional gust above 12kts will be possible this afternoon at sites BDN/RDM. Lawhorn/82 && .Preliminary Point Temps/PoPs... PDT 71 45 75 47 / 0 0 0 0 ALW 72 49 74 51 / 0 0 0 0 PSC 74 45 80 49 / 0 0 0 0 YKM 72 46 78 42 / 0 0 0 0 HRI 73 45 79 49 / 0 0 0 0 ELN 68 44 73 39 / 0 0 0 10 RDM 74 39 75 37 / 0 0 0 0 LGD 69 43 74 43 / 0 0 10 0 GCD 71 42 73 41 / 0 0 20 20 DLS 74 49 78 47 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... WA...None. OR...None. && $$ DISCUSSION...86 AVIATION...82

804 FXUS65 KREV 051917 AFDREV Area Forecast Discussion National Weather Service Reno NV 1217 PM PDT Sun Apr 5 2026 .KEY MESSAGES... * Dry weather with unseasonably warm temperatures will prevail early this week with enhanced afternoon breezes Monday and Tuesday. * Pattern shift to cooler and wetter conditions by midweek with valley rain and high elevation snow. * Isolated to scattered thunderstorms possible Thursday and Friday, though confidence remains low on the extent of the impacts. && .DISCUSSION... Mostly dry and mild through at least Tuesday of this week with afternoon highs 10-15 degrees above normal. This translates to the mid 70s for W NV and the mid 60s for Sierra communities. Afternoon breezes will pick up Monday and again Tuesday afternoon due to a brief shortwave cutting across southern Nevada. A pattern change arrives Wednesday as a low pressure system approaches the California coast. This brings cooler and wetter conditions, with chances of precipitation by mid-afternoon Wednesday. Snow levels are high, over 9000`, so the main precip type will be rain. However, said precip will have to override the dry layer we have at the surface; precip Wednesday will likely be virga. The most interesting piece to note in the forecast for this week is the chance for thunderstorms both Thursday and Friday. Chances Thursday are a bit more isolated, but increase in areal coverage Friday to be of the "scattered" variety. Model soundings for Reno show roughly 430 J/kg of CAPE and 0.5" PWATs Friday. Both of these values are approaching the max values based on sounding climatology. The low bringing these storm chances will remain cut off from the upper level flow, which will allow for track meanderings. Check back here to see how confidence changes; confidence on the extent of the impacts by the end of the week remains low for now. -Giralte && .AVIATION... VFR conditions expected for all terminals. Winds will be light and variable today, with afternoon breezes up to 15-20 kts kicking in Monday and Tuesday afternoons. -Giralte && .REV Watches/Warnings/Advisories... NV...None. CA...None. && $$

401 FXUS66 KSTO 051937 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1237 PM PDT Sun Apr 5 2026 .KEY MESSAGES... - Dry and warm weather expected into early next week with Minor HeatRisk. - Cooler temperatures and unsettled weather mid to late next week with rain and thunderstorms expected. && .DISCUSSION... ...Today through Wednesday... Above normal temperatures and dry conditions are anticipated across the region into early next week as ridging remains in place. Daytime highs will be 10-20 degrees above normal through early next week, even though temperatures will trend cooler as we head into midweek. High temperatures will be into low to mid 80s in the Valley today through Monday, with Widespread Minor HeatRisk in the Valley, Delta and foothills. Individuals should practice heat safety and use caution and life jackets near cold area waterways. Monday and Tuesday afternoon and evening depict some Delta Breeze influence with gusts up to 15-20 MPH that should moderate our heat impacts. ...Wednesday to Late Week... Ensembles depict a troughing pattern developing across the area by mid to late week, bringing cooler temperatures and unsettled weather conditions. Recent trends have delayed the pattern change with now the burnt of impacts becoming more Thursday-Friday. Confidence is still low with this system but we saw improved consistency across models compared to this time yesterday. Highest chances for light precipitation appears to be over the northern Sacramento Valley, foothills, and mountains, with the latest NBM highlighting a 50-75% chance of precipitation greater than 0.50 inches, highest over the Sierra. NBM probabilities indicate the potential for thunderstorms each day from Wednesday to Saturday with 10-20% for Wednesday and Saturday and 20-35% on Thursday and Friday. Stay tuned for updates as the forecast continues to evolve and can better dial in specific thunderstorm impacts and possibilities. && .AVIATION... VFR conditions are forecast to prevail over interior northern California over the next 24 hours. Surface winds generally at/below 12 kt in the Valley; locally speeds in the mountains. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$

596 FXUS65 KMSO 051830 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 1230 PM MDT Sun Apr 5 2026 .DISCUSSION... KEY MESSAGES: - Peak warmth on Monday with above average temperatures through the whole forecast period. - Strong winds on Tuesday ahead of a cold front. - Showery weather returns next weekend, especially in the mountains. Temperature forecasts are on track to be 15-20 degrees above average for tomorrow afternoon. Even after the cold front on Tuesday, temperatures remain 2 to 5 degrees above average and late in the week will reach 10 degrees above average again. So even when the weather is active, the region isn`t seeing any air mass cool enough to bring it down below average temperatures which are generally in the low to mid 50s by the end of the week. Confidence is increasing for strong winds on Tuesday. Wind advisories will likely be issued tomorrow if models hold their course. Widespread wind gusts across the northern Rockies over 30 mph are expected for most of the afternoon on Tuesday. Widespread gusts over 40 mph are expected for a few hours, and isolated damaging wind gusts over 50 mph are possible with the cold front as it moves through. The chances for strong winds vary based on the ensemble system you look at. According to the NBM, the chances for wind gusts over 40 mph are 80-100 percent in the mountains and range from 20 to 50 percent in the valleys, depending on the valley. In the mountains chances for 50 mph gusts range from 40-75 percent depending on the mountain range. In the valleys it`s generally less than 20 percent, with the notable exceptions of the Bitterroot Valley west of Highway 93 and the southwest Mission Valley near Hot Springs where it`s 30-50 percent chances for a gust over 50 mph. High resolution, short term ensembles like the REFS show lower chances than the NBM. In any case, be prepared for gusty winds on Tuesday. Another ridge builds in behind the front for Friday, but as southwest flow becomes established this weekend, showers and precipitation are in the forecast once again. && .AVIATION...A ridge remains dominant over the region through tomorrow causing VFR flight conditions. Some morning fog along the rivers near terminals KMSO and KGPI is likely, but this is not expected to expand into the terminal area. Late Monday night around 07/06Z winds start increasing for what is expected to be a windy day on Tuesday. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...ID...None. && $$

288 FXUS65 KBOI 052011 AFDBOI Area Forecast Discussion National Weather Service Boise ID 211 PM MDT Sun Apr 5 2026 .KEY MESSAGES... - High pressure will bring well above normal temperatures and dry conditions through Monday, with some valley highs reaching the mid 70s. - A slight chance of showers and thunderstorms will develop late Monday afternoon across the higher terrain of southeast Oregon and the west central Idaho mountains. - A dry cold front passing through Tuesday will bring breezy winds and a 5 to 10 degree cooling trend, primarily for northern areas. && .SHORT TERM /Through Tuesday Night/... The upper level ridge axis will move directly overhead tonight and Monday, maintaining the dry and unseasonably warm weather across the region. Low temperatures tonight will remain mild, generally in the upper 30s to mid 40s in the lower valleys. For Monday, high temperatures will continue their upward climb, reaching 10 to 15 degrees above seasonal normals. Many lower valley locations, including the Treasure Valley, will see highs in the mid 70s. As the ridge begins to shift eastward Monday afternoon, a weak system approaching from the west will introduce just enough instability and moisture for a slight chance (15 to 25 percent) of showers and thunderstorms. This activity is expected to be confined to the higher terrain of southeast Oregon and the west central Idaho mountains during the late afternoon and evening hours. By Tuesday, a more potent upper level trough will move into the Pacific Northwest from the north, pushing a dry cold front through the area. While this front lacks significant moisture, it will tighten the pressure gradient, resulting in breezy northwesterly winds. The strongest winds are expected across the western Magic Valley and Camas Prairie with gusts up to 45 mph. High temperatures on Tuesday will be trickier to pinpoint due to the timing of the front; northern zones will see a noticeable cooling of 5 to 10 degrees compared to Monday, while southern areas may remain warm until the front passes later in the evening. Tuesday night will be notably cooler and breezy as the front clears the region. && .LONG TERM /Wednesday through Sunday/... A slight cool down is in store Wednesday as the grazing shortwave exits our area to the east and switches flow to be out of the northwest. Guidance is coming into alignment on the slower progression of a low that will develop off of the coast of California. As alluded to in previous discussions, this will favor a generally drier and warmer solution for our area. The exception to this will be in SE Oregon and near the Idaho Nevada border. As the California low slowly moves east, moisture advection around the low will lead to a 10-25% chance of precipitation in southern Harney County Wednesday afternoon. As well as a 15-40% chance of precipitation Thursday afternoon, mainly in SE Oregon and near the ID/NV border. It is worth mentioning that there is still some uncertainty regarding the speed of this low, which translates into the precipitation chances. Southerly flow will allow for a warming trend through the end of the workweek. Late Friday into the weekend, precipitation chances will increase area-wide as the low moves inland. && .AVIATION /18Z Sunday through Monday/... Issued 1107 AM MDT SUN APR 5 2026 VFR under scatter/broken high clouds. Surface winds: E-SE 5-15 kt. Winds aloft at 10kft MSL: S 5-15 kt, becoming SW-W 5-15 kt after Mon/00z. KBOI...VFR under high clouds. Surface winds: S-SE 8-12 kt this afternoon, then SE under 10 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 SHORT TERM...JDS LONG TERM....NF AVIATION.....NF

208 FXUS65 KLKN 051928 AFDLKN Area Forecast Discussion National Weather Service Elko NV 1228 PM PDT Sun Apr 5 2026 .KEY MESSAGES... * A warming trend under high pressure will continue into this week * Possible low pressure system mid to late week returns precipitation chances to northern and central NV && .DISCUSSION... (This evening through next Saturday) WEATHER PATTERN OVERVIEW: A ridge pushing to the east of the Great Basin will open its western flank up to the area meaning southerly flow and warming temperatures the remainder of Sunday and Monday. Though no temperature records are in danger at any climate site through Monday, high temperatures will be about 7-10 degrees above normal for early April By mid week west northwest flow will settle into the profile over the region under the influence of a broad ULT to the north over Canada. To the west over the Pacific Ocean a low pressure center continues to strengthen. Previous model runs had moisture from the LPC interacting with a short wave in the upstream flow of the ULT to the north. Current model runs, however, have re-positioned the shortwave further north and east robbing the moisture still advecting from the south of any needed forcing. This has diminished QPF and snow totals for the area at least for mid week expectations. By Thursday the LPC is closer to the SW CONUS and will begin to provide its own forcing to the area. A fairly warm system, shower activity on Thursday and Friday will mainly be in the form of rainfall for north-central NV. Good frontogenesis Thursday afternoon and Friday will render rainfall amounts currently forecasted as 0.1-0.15 north of US-50 on Thursday, and 0.1-0.2 for central and east-central NV on Friday. CAPE values at that time are not impressive but with enough forcing in the downstream of the LPC to the west isolated convection isn`t impossible especially over northern Nye and White Pine Counties. FORECAST CONFIDENCE & DEVIATIONS: High confidence in a warming trend continues. Low confidence in the potential incoming weather system this week. Moisture values continue to dwindle and placement of the low has moved considerably in the last 24 hours. No major changes to short term grids is needed at this time. && .AVIATION... VFR conditions are forecast at all terminals through Monday afternoon under high pressure. Afternoon winds will be light in nature with no precipitation currently in the forecast. && .LKN Watches/Warnings/Advisories... None. && $$ DISCUSSION...99 AVIATION...99