928 FXUS66 KSEW 101753 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 1053 AM PDT Tue Jun 10 2025 .SYNOPSIS...A weakening upper level ridge over the region and increasing onshore flow will produce cooler temperatures across the area today. A weak upper trough will approach Western Washington on Wednesday then settle over the area into early next week. This will lead to cooler temperatures, increased cloud cover, and occasional chances for mountain showers and coastal drizzle. && .SHORT TERM /TODAY THROUGH THURSDAY/...The current forecast remains on track today. 33 Previous forecast...Onshore flow continues to increase as thermally induced low pressure shifts east of the Cascades and upper ridging overhead weakens. The HQM/SEA gradient is over 2 millibars early this morning with marine air flooding inland as noted by some gusty winds at Shelton earlier with stratus spreading inland through the Chehalis Gap. High temperatures across much of the interior will be some 10 degrees or more cooler over yesterdays high temps while coastal areas may struggle to get north of 60 F. The cooling continues into Wednesday as low level onshore flow increases yet further ahead of a weak upper trough. Some stratus will likely make it into the interior lowlands on Wednesday morning and high temperatures will drop several more degrees with highs around Puget Sound mostly within a couple degrees either side of 70. A weak upper trough axis will swing onshore during the day on Thursday. At this time, it still appears to remain mostly dry. Though it will likely produce mostly cloudy skies, slightly below normal temperatures, and a couple of mountain showers and/or coastal drizzle. .LONG TERM /FRIDAY THROUGH MONDAY/...A mean upper trough position remains just offshore Friday into early next week with a series of weak disturbances rotating onshore. This will produce little in the way of impacts for the area with temperatures trending a little below normal. Some of the Euro ensembles try to bring a more significant trough onshore just beyond the 7 day period, but this is notably absent from much of the GFS ensembles which lends a fairly high degree of uncertainty to the forecast much of next week. 27 && .AVIATION...Southwesterly flow aloft across this region this morning ahead of a weak upper trough approaching the areas. This is maintaining light onshore flow that will increase a bit through the day and continuing tonight. A few lingering patches of IFR stratus near the coastline will continue to clear out, leaving generally clear skies today with some passing high clouds. Slightly stronger onshore flow Wednesday morning will push the stratus as far east as the Central Sound for a few hours between 12z-18z. Outside of the stratus, generally clear skies continue. KSEA...VFR under clear skies through the day today. South winds will veer to northwest this afternoon, reaching around 6 kt after 22z through around 04z. Southwesterly winds resume by 06z onward, but push of low stratus likely brings a few hours of IFR conditions arriving after/around 12z. && .MARINE...Surface high pressure over the offshore waters with lower pressure inland through the week. High pressure will build over the waters Saturday. Northwesterly flow will persist over the coastal waters the next several days. Diurnal westerly pushes across the Strait expected in the evening hours through the period. Small craft advisory northwesterly winds over the outer coastal waters with seas 10 to 13 feet through at least Friday. Winds and seas slowly subsiding Friday night into the weekend. Small craft advisory today for the inner coastal waters for 10 foot seas. Seas subsiding tonight into Wednesday. Gale watch for the Central and Eastern Strait of Juan de Fuca for westerly winds possibly as high as 35 knots Wednesday evening. Felton && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 1 PM PDT this afternoon for Grays Harbor Bar. Gale Watch from Wednesday evening through late Wednesday night for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory until 6 PM PDT this evening for Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville Out 10 Nm- Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. Small Craft Advisory until 6 PM PDT Wednesday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm. && $$

978 FXUS66 KPQR 101641 AAA AFDPQR Area Forecast Discussion...UPDATED National Weather Service Portland OR 941 AM PDT Tue Jun 10 2025 .SYNOPSIS...A pattern change aloft will see a steady transition to cooler weather through the week as onshore flow strengthens. Largely dry conditions continue into the weekend, with the next chance for widespread rain not expected until next week. && .SHORT TERM...Now through Friday Night...One final day of warm to hot temperatures is in store across inland portions of the region as the upper-level ridge of recent days continues to shift eastward toward the Central Plains while upper-level troughing begins to develop over the Pacific Northwest. Cooler air will steadily push into the region on strengthening onshore flow, yielding afternoon high temperatures trending downward through Friday. Temperatures today will still reach afternoon highs in the mid to upper 80s across inland valleys today, some 15-20 degrees above normal, while areas of higher terrain see 70s and the coast remains in the upper 50s to mid 60s. The hottest temperatures around 90 degrees are expected along the central Columbia Gorge to around Hood River, where locally Moderate HeatRisk may still present hazardous conditions for those without effective cooling and/or adequate hydration. Those seeking relief from the heat in area lakes and rivers should continue to be aware that water temperatures remain cold and hypothermia can occur despite hot air temperatures. The risk of hazardous heat quickly drops through the workweek as afternoon highs across inland valleys fall by about 4-8 degrees each day, reaching seasonable values in the low 70s by Friday. Overnight lows similarly trend downward by 2-3 degrees each night from upper 40s to low 50s tonight to low to mid 40s on Friday night. Elsewhere, temperatures similarly trend cooler albeit at a slower rate. Largely dry weather is expected aside from areas of mist or drizzle possible along the coast. Stronger onshore flow may also yield periods of breezier conditions with westerly to northwesterly gusts reaching 20-30 mph in Coast Range gaps and the central Columbia Gorge. -Picard .LONG TERM...Saturday through Monday...There is a growing consensus among long-range ensembles that a closed upper low will track to the southeast from south-central Alaska toward the Haida Gwaii this weekend. Repeated shortwave impulses on the southern flank of the low may bring chances for light rain to the region this weekend, but few ensemble members suggest much in the way of accumulations until early next week when a more robust shortwave could bring the best chance for widespread accumulating rain in almost two weeks. -Picard && .AVIATION...Onshore flow through the next 24 hours. VFR inland with high clouds and patchy low stratus along the Columbia River. mixture of MVFR and VFR stratus along the coast. A sea breeze is pushing mist into KAST. Area web cameras show some sun breaks though so could see some partial clearing after 21Z Wednesday. With the northerly flow winds will increase through the central Willamette Valley with gusts up to 15 kt, except slightly higher above 500 ft. PDX AND APPROACHES...VFR conditions and clear skies through the TAF period. -Muessle && .MARINE... Little change in the forecast as surface high pressure centered well offshore maintains a northerly wind regime through the end of the week. Current observations show winds gusting to 20-25 kt over the coastal waters, with seas running 8-9 ft due to a combination of short period wind waves and building northwest swell. These conditions will maintain Small Craft Advisories through at least Wednesday and possibly beyond as combined seas generally remain in the 7-9 ft range for the next several days. Additionally, the Columbia River Bar will have strong ebb chop this morning until 8 AM so have issued a Small Craft Advisory. Another Small Craft Advisory may be needed for tomorrow morning between 2 AM and 8 AM as strong ebb chop will return. ~Hall/CB && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...Small Craft Advisory until 11 AM PDT this morning for PZZ210. Small Craft Advisory until 11 PM PDT this evening for PZZ251>253. Small Craft Advisory until 5 PM PDT Wednesday for PZZ271>273. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

083 FXUS66 KMFR 101754 AFDMFR Area Forecast Discussion National Weather Service Medford OR 1054 AM PDT Tue Jun 10 2025 .Updated AVIATION Discussion... && .AVIATION...10/18Z TAFs...Along the coast, areas of IFR/LIFR conditions are gradually retreating back to the immediate coast with improvement to VFR for coastal locations expected between 18z & 21z. The lower conditions are likely to linger south of Gold Beach the longest. VFR conditions along the coast are likely to be brief, with IFR/LIFR expected to return in the early evening and continue into Wednesday morning. VFR conditions will prevail for all other areas through the TAF period. Isolated to scattered thunderstorms are expected this afternoon and evening south of the Umpqua Divide and from the Cascades east in southwest Oregon and across Siskiyou and Modoc counties in northern California. Heavy rain from thunderstorm cores could briefly lower visibilities to MVFR, but the main hazards with these storms will be strong and erratic outflow thunderstorm winds and lightning. Hail is also possible and there is a 5% chance of large damaging hail of 1 inch or more diameter, and strong winds of 60 mph, including for Medford (KMFR), Klamath Falls (KLMT), Montague (KSIY), and Lakeview (KLKV). The probability of strong/severe thunderstorms, and storm coverage will diminish after sunset, but thunderstorm chances (15-30%) will persist late tonight into early Wednesday morning for southern Klamath, Lake, northeast Siskiyou, and northern Modoc counties. -DW/BR-y && .PREV DISCUSSION... /Issued 351 AM PDT Tue Jun 10 2025/ Discussion...Today will be more active with storms covering a larger portion ofthe forecast area. An upper trough will approach from the west and put the area in a favorable position for isolated to scattered thunderstorms along and east of the Cascades and in northern California, with the instability parameters greatest in Western Siskiyou County, northeast into Klamath and Lake counties, and the southeast portion of Jackson County. Given the position of the upper trough axis and stronger trigger ahead of it could bring a heighten threat for isolated strong to severe storms that will produce gusty winds near and withing storms, and possible hail for the areas mentioned above. Also, the amount of available moisture will be higher, therefore storms will have a better chance of producing locally heavy downpours for the same areas. This will include most of Jackson County, including Medford, Phoenix, Talent, White City, and Ashland. Steering flow will be from the southwest, therefore storms will tend to move from southwest to northeast. However, the steering flow will be on the light side at around 10 knots, thus, storms may not be quick movers, increasing the possibility for localized urban flooding in areas that experience heavier rainfall. Storms are expected to decrease in coverage, but will continue into the overnight hours Tuesday night into early Wednesday morning, with the upper trough axis to the west. These are likely to be isolated and confined to portions of Lake and Klamath counties. The upper trough axis is expected to be move east of the forecast area later Wednesday morning with a drier air mass and stable westerly flow pattern. The NBM and most of the high resolution models indicate a dry Wednesday. But, there is some support in the GFS, HREF, and SREF for a slight chance of thunderstorms to pop up Wednesday afternoon from south central Siskiyou County northeastward across northwest Modoc County into Lake County. We will continue to lean toward the NBM for now and reassess with the 12Z suite of data. At the worst, the risk of storms still would be far less than that of today. From mid-week, we`ll be heading into a pattern of weak upper troughing that will persist into Fathers Day weekend. The net result will be cooler, more seasonable afternoon temperatures for the interior with continued night and morning low clouds and fog along and near the coast. Odds are it will be dry during this time. -Petrucelli/DW MARINE...Updated 200 AM Tuesday, June 10, 2025...High pressure offshore and low pressure inland are expected to persist into the weekend. The highest seas are expected today into tonight, with slight improvement to follow. The strongest winds and steepest seas are expected south of Port Orford to around Pistol River and out 30 nm from shore. Seas will remain dominated by a mix of northerly wind wave and fresh swell, with steep seas across all of the southern Oregon coastal waters through Wednesday evening, then south of Port Orford at least through Thursday evening. -DW FIRE WEATHER...Updated 200 PM Monday June 9, 2025...Dry and mostly hot weather will continue for one more day. The main concern ahead will be isolated to scattered thunderstorms in the afternoon and early evening hours on Tuesday. A stronger upper trough will approach from the west, but the trend is for a slower arrival of the upper trough axis. Even so, this will put the area in a more favorable position for some storms be strong to severe since the trigger is expected to be stronger along with greater instability. So far, guidance is in pretty good agreement suggesting storms will cover a larger potion of the area and the shear number of storms will be higher. Due to the combination of instability, stronger trigger and favorable dynamics, There is concern for storms to produce gusty outflow winds, with hail possible with storms are end up strong to severe. The one difference compared to the last couple of days will be the amount of available moisture. PWATS (the amount of moisture in a column will be higher, and the sub layer won`t be as dry. Thus there could be a heighten concern for locally heavy downpours. This will include most of Jackson County. Steering flow will be from the southeast, therefore storms will tend to move from southwest to northeast. However, the steering flow will be on the light side, thus, storms may not be quick movers, thus increasing the possibility for localized flooding in areas that experience heavier rainfall. Current fuel conditions suggest they could end up being more receptive to new starts if we have a significant mount of lightning. Please use extra care when participating in activities that may create sparks or embers. These can ignite fires that can quickly grow out of control, especially around abundant dry or unmaintained fuels. With the slower arrival of the upper trough axis, we could see isolated storms linger Tuesday night into Wednesday morning, then once the upper trough axis shift east later Wednesday morning, then threat for storms will shift east of the area. Wednesday into Fathers Day weekend, it will be dry with a cooling trend with upper troughing setting up resulting in temperatures near or slightly below seasonal norms. -Petrucelli && .MFR WATCHES/WARNINGS/ADVISORIES... OR...CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory until 11 PM PDT Thursday for PZZ356-376. Small Craft Advisory until 11 PM PDT Wednesday for PZZ350-370. && $$

678 FXUS66 KEKA 100705 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1205 AM PDT Tue Jun 10 2025 .SYNOPSIS...Isolated thunderstorm threat for Trinity, Del Norte, and NE Mendocino County continues Tuesday afternoon into the evening. Warm temperatures continue Tuesday, however, a cooling trend will keep temperatures cooling steadily through the week into the weekend. && .DISCUSSION...* Isolated afternoon and early thunderstorms in the interior, primarily Trinity County on Tuesday. Cloud-to-ground lightning strikes and gusty erratic winds possible. * Interior heat risk diminishing and becoming low on Wednesday. High temperatures generally decreasing each day this week along with cooler overnight low temperatures late this week. * Gustier afternoon and evening westerly and northwesterly breezes expected mid to late week. An upper level ridge over California will migrate eastward as a weak upper level trough swings over our area from the north. This synoptic weather change will ad variety to our daily weather. First and foremost, there is CAPE aloft over the Klamath mountains, allowing for daytime heating to pop into thunderstorms for one more afternoon. The GFS is showing "Most Unstable CAPE" values centered over Del Norte, Trinity, and Northeastern Mendocino County Tuesday night. Brief wetting rain, cloud to ground lighting, and small (pea- sized) hail is possible with these storms. upper level vorticity will be present in the 700mb level which could help sustain some thunderstorm briefly. However, the storms look relatively dry with the troposphere being at 46% RH by 00Z/5PM. Tuesday has a decreased chance in the NBM probability for thunder with the Trinity Horn area having a 10-20% chance of thunderstorms. Del Norte and NE Mendocino show only a 0-5% chance so confidence remains low for storms developing in those areas. THe majority of the convective development looks to stay much further east of CWA in southern OR and NE CA. Potential for gusty winds and dry lightning could be a fire weather concern for these areas. This incoming trough looks quite dry and main impacts appear to be a return of stronger gusty winds and cooler temperatures. Inland valleys will struggle to break 90F on Wednesday through the rest of the week and weekend. High tempertures look to be around the low 80s at the warmest for inland valleys Friday and Saturday as of right now. This comes a relief after what has been a warm couple of weeks to start meteorological summer. These cooler temperatures will also be accompanied by stronger winds with afternoon wind gusts around 15-20mph in the later portion of the week. && .AVIATION...A strong marine inversion has persisted along the coast and has gradually lowered to LIFR ceilings overnight. Ceilings will most likely continue to drop through the night with short periods of dense fog (50% chance) likely along the coast around sunrise. High resolution models indicate ceilings will be slow to lift along the coast with Humboldt Bay even having a 30% chance of at least IFR conditions persisting all day. The interior, meanwhile, will remain VFR with isolate afternoon thunderstorms over high terrain being the greatest potential concern. /JHW && .MARINE...Gentle northerly winds have continued to spread throughout the waters overnight with short period seas generally below 5 feet. North winds will steadily increase in the outer waters through around midweek with strong wind gusts in the southern outer waters by Wednesday morning. Strong winds will spread north by Thursday with near gale force gusts fanning south of Cape Mendocino. The sea state will be nearly entirely controlled by short period wind waves of 5 to 7 feet around mid week. High pressure stalling over the eastern Pacific will encourage strong northerly winds to continue into the weekend. /JHW && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 9 PM this evening to 9 PM PDT Wednesday 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

441 FXUS66 KMTR 101846 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1146 AM PDT Tue Jun 10 2025 ...New AVIATION... .SYNOPSIS... Issued at 238 AM PDT Tue Jun 10 2025 A slight cooling trend starts today for the more interior areas Otherwise expect a continuation the daily patter of marine layer clouds each night and morning, some coastal drizzle, a few pockets of fog, and breezy onshore winds each afternoon and evening. && .SHORT TERM... (Today and tonight) Issued at 238 AM PDT Tue Jun 10 2025 The overnight forecasting team did some extra polishing into the short term forecast. The fog/drizzle/ and cloud cover forecast have been finely tuned and adjusted as the marine layer continues to dominate the coast and the slightly inland. Patches of fog will favor the North Bay valleys as well as the coast through the late morning. Brief moments of drizzle will also be possible along the immediate coast and around the Monterey Bay. So fairly similar morning conditions as the last few days, but the pattern does begin to change today. The slight ridge pattern is turning into a more zonal upper level pattern. What does that mean? I`m glad you asked. It means the upper level environment will start moving to a more direct west to east flow over the west coast, leading to more onshore flow. It also means today will be cooler for the more interior areas that haven`t been seeing those strong pushes of low level clouds from the marine environment. Don`t expect it to be a robust cool-down, as most of the interior areas are only seeing a few degrees difference. For areas along the coast and affected by the marine layer, don`t expect much in the way of change. A cloudy morning, with some clearing in the afternoon and then back to cloudy in the evening. It`s very much the summer stratus pattern giving the "June Gloom." The change to zonal flow will expand the marine layer, allowing it to flow deeper inland, but looks to reduce the concentration of moisture within the marine layer, allowing for some areas to see cloud cover to clear sooner. && .LONG TERM... (Wednesday through Monday) Issued at 238 AM PDT Tue Jun 10 2025 The upper-level pattern will continue to promote onshore flow well into the long term forecast. This will continue the cooling trend for the more interior areas, as well as the cloudy coastal and valley conditions. A weak trough looks to move through the area over the weekend, allowing the marine layer expansion to continue. This will result in the cloud layer levels rising through weekend, and less chances for fog. After that, the longer term models are struggling to figure out what to do with the post-trough environment. Some models are hinting at a quick transition into a ridge pattern in the middle of the next work week, leading to another warming trend, while others stay more zonal, which keeps our current trend. This will be something worth checking back in as the forecast continues to develop! && .AVIATION... (18Z TAFS) Issued at 1146 AM PDT Tue Jun 10 2025 .AVIATION...The forecast will be the timing of the status of the stratus as the forecast has been and will be on repeat. Tended to trend with observations from today and yesterday for timing of arrival and departure respectively, assuming we have a similar marine layer depth. Expect IFR to MVFR cigs at most sites, with interior locations like KSJC and KLVK clearing the fastest, followed by North Bay terminals. IFR cigs may get low enough to drop vis MVFR at times. Vicinity of SFO...Medium to high confidence in the SFO forecast as the stratus pattern looks similar to what we saw yesterday, perhaps slightly stronger for stratus remaining socked in to the east at KOAK. Expect to have MVFR conditions hold through the period, with the chance for clouds becoming BKN for a period this afternoon. This will be short lived as the westerly feed of stratus is strong. Models generally struggle to capture this, with the HRRR, GLAMP, and NBM supporting this. Guidance seems supportive of potential clearing to some degree tomorrow afternoon between 18Z and 0Z. Though stratus looks to make yet another return after that. SFO Bridge Approach...The approach should fair better than the vicinity of SFO as we can see the stratus mixing out over the southern portion of the bay. The stratus line appears to be holding right around the vicinity given the continuous westerly flow. Expect similar conditions to yesterday where visuals will be short lived. Monterey Bay Terminals...Stratus will continue to hug the coast with clearing expected around Santa Cruz and the north part of the Bay. KSNS should see some clearing as well this afternoon based on persistence forecasting and satellite imagery. Unsure if MTR will be so lucky, opted to try and trend towards some VFR conditions with a TEMPO this afternoon. Otherwise expect MVFR to IFR cigs, and reduced vis with the low cigs. && .MARINE... (Today through Sunday) Issued at 238 AM PDT Tue Jun 10 2025 Fresh to strong northwesterly breezes will prevail through the forecast period with gale force gusts possible beginning Wednesday afternoon along the coastal jet regions of Point Reyes and Point Sur. Significant wave heights will be moderate today, building to become rough tomorrow. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 3 PM PDT Wednesday for Pt Pinos to Pt Piedras Blancas 0-10 nm-SF Bay N of Bay Bridge. Small Craft Advisory until 9 PM PDT this evening for Mry Bay- Pigeon Pt to Pt Pinos 0-10 nm. Small Craft Advisory from 9 AM to 3 PM PDT Wednesday for Mry Bay- Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory from 3 PM this afternoon to 3 PM PDT Wednesday for Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...Murdock LONG TERM....Murdock AVIATION...KR MARINE...Sarment 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

321 FXUS66 KOTX 101756 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 1056 AM PDT Tue Jun 10 2025 .KEY MESSAGES... - Moderate to major Heat Risk continues through Tuesday. - Dry and breezy with elevated to critical fire weather concerns Monday through Thursday. - Cooler but still warm and mountain thunderstorms mid to late this week. && .SYNOPSIS... Very warm temperatures continue Tuesday. Breezy winds and dry conditions today through Thursday will lead to increased fire weather concerns. Temperatures will gradually cool down starting Tuesday and mountain thunderstorm chances begin to increase Wednesday. && .DISCUSSION... Tonight and Tuesday: The ridge of high pressure will continue to be in place through Tuesday morning. A transition period will begin Tuesday afternoon as a weak shortwave will begin to break down the ridge. Ensembles are in decent agreement of the pattern change. The timing of the ridge breakdown is shaving a few degrees off from Mondays highs. While temperatures are expected to be lower, in the upper 80s and 90s, heat risk can still cause issues to those not acclimated or sensitive to it. The heat mixing with the dry, breezy conditions continue to keep fire concerns for the Cascade Valleys and western Columbia Basin. Winds will increase during the afternoon with sustained in the teens and gusts up to 30 MPH possible. Overnight temperatures are expected to bring a little relief with a range in the upper 50s and 60s. Wednesday through Sunday: A more robust trough associated with a Gulf of Alaska Low will begin to dig off the coast of the Pacific Northwest. It will usher in a cooler temperatures will begin drop into 80s for Wednesday and 70s by the weekend. Overnight temperatures will continue to be in the 50s. The cooler temperatures are still above normal for this time of year. The winds will continue to be diurnally driven. They will become breezy during the afternoon and calm overnight. Unfortunately, the trough is not bringing a lot of moisture for the Inland Northwest. Any shower activity is relegated to the Northeast WA and the ID Panhandle with less than a tenth of an inch expected over the weekend. Weak instability leads to a low chance of an isolated thunderstorm in these areas. /JDC && .AVIATION... 18Z TAFS: VFR conditions will prevail. West to northwest winds at KEAT, and those winds will increase to around 15 kts in the late afternoon around 23Z. Winds will increase to between 10-15 kts across the Columbia Basin as well during the afternoon impacting KMWH-KGEG-KSFF-KPUW terminals. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence for VFR conditions. Conditions will be right for critical fire weather conditions in the afternoon and evening near KEAT to KWMH that may result in fires that impact these terminals through Wednesday. /JDC ----------------------- 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 62 90 59 86 57 80 / 0 0 0 0 10 0 Coeur d`Alene 60 89 58 84 55 79 / 0 0 0 0 10 0 Pullman 60 87 57 82 52 78 / 0 0 0 10 10 0 Lewiston 66 95 63 89 57 84 / 0 0 0 10 10 0 Colville 57 91 56 88 56 81 / 0 0 0 10 20 20 Sandpoint 57 88 56 84 54 79 / 0 0 0 10 20 10 Kellogg 62 85 59 82 55 77 / 0 0 0 10 20 10 Moses Lake 63 97 60 93 58 85 / 0 0 0 0 0 0 Wenatchee 66 93 63 90 60 81 / 0 0 0 0 0 0 Omak 61 93 60 91 59 83 / 0 0 0 10 10 10 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...Heat Advisory until 9 PM PDT Tuesday for Central Chelan County- Lower Garfield and Asotin Counties-Northeast Mountains- Okanogan Highlands-Okanogan Valley-Spokane Area-Upper Columbia Basin-Washington Palouse-Waterville Plateau- Western Chelan County-Western Okanogan County. Extreme Heat Warning until 9 PM PDT Tuesday for Moses Lake Area-Wenatchee Area. Red Flag Warning until 9 PM PDT this evening for Foothills of Central Washington Cascades (Zone 705)-Waterville Plateau (Zone 706). Red Flag Warning from 3 PM to 9 PM PDT Tuesday for Foothills of Central Washington Cascades (Zone 705)-Waterville Plateau (Zone 706). ID...Heat Advisory until 9 PM PDT Tuesday for Central Panhandle Mountains-Coeur d`Alene Area-Idaho Palouse-Lewiston Area- Northern Panhandle. && $$

734 FXUS66 KPDT 101717 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1017 AM PDT Tue Jun 10 2025 .UPDATED AVIATION. .AVIATION...18Z TAFs...VFR conditions are expected to prevail for the entire period. Primary threats for this period will be high winds and slight chances of thunderstorms across areas of the Central OR and parts of the Southern Blues. Winds for DLS/PDT will continue to gust up to 15-25 knots for the next several hours, with PDT decreasing to 10-15 knots by 04Z. The thunderstorm threat will be secluded to the RDM/BDN sites from 21Z-03Z with PROB30 included in their TAFs. The heaviest thunderstorms could drop VIS and CIG down to MVFR briefly but it is not expected to linger for long periods of time if they occurred. && .PREV DISCUSSION... /issued 1013 PM PDT Mon Jun 9 2025/ UPDATE...Clear skies throughout the region. Hit triple digits across many parts of the Basin and the Kittitas Valley. Saw Advisory criteria that would warrant additional highlights in the southern foothills of the Blues and North-Central Oregon that will remain in effect until 9 PM Tuesday. AVIATION...06Z TAFs...VFR conditions to prevail through the period. A system clipping the region to the south will bring increasing thunderstorm chances mainly south and east of sites RDM/BDN tomorrow afternoon. That said, high-res short term model guidance indicates a prob30 of an isolated thunderstorm or two impacting the sites between 21Z-03Z. Otherwise, few-sct CIGS AOA 15kft AGL will impact all sites tomorrow. Mostly light winds will prevail tonight, then increase between 17Z-03Z at sites PDT/RDM to 12-15kts with gusts to around 25kts. Site DLS will also see winds increase to 12-20kts with gusts 20-30kts after 17Z. Lawhorn/82 PREV DISCUSSION... /issued 143 PM PDT Mon Jun 9 2025/ SHORT TERM... Tonight through Wednesday night... Strong high pressure remains over the Pacific Northwest. This high will keep very hot temperatures and moderate to high HeatRisk across much of the region today. The ridge will move a bit eastward on Tuesday and gradually break down and we will be in a more southwesterly flow by late afternoon early evening. Still, it is expected to be another hot day, just not as hot as today. Southwesterly flow will continue into Wednesday. As the ridge moves eastward on Tuesday into Wednesday, there will be a slight (15-20%) chance of showers and thunderstorms across central Oregon and the Ochoco-John day Highlands Tuesday and then more across Eastern Oregon on Wednesday. Some of these thunderstorms will be dry, though there could be some that put down some light (a few hundredths) amounts of rain. There are 500 to 1000J/kg of CAPE in spots both Tuesday afternoon and Wednesday afternoon but also some decent CIN. Winds will increase both this afternoon and Tuesday afternoon, with Tuesday having the stronger winds. The combination of the strong winds and low relative humidities will yield critical fire weather conditions and a Red Flag Warning remains in effect. through Tuesday. High temperature will remain above normal through the period though they will slowly decrease. Highs on Tuesday will be in the 90s to around 100 degrees in the Columbia Basin. These temperatures are about 20 degrees above normal. Highs on Wednesday will be about 7 to 10 degrees cooler than Tuesday, and range mainly in the 80s to lower 90s. These highs are still about 10 degrees above normal. HeatRisk will remain moderate across the Columbia Basin, Yakima Valley and Blue Mountain Foothills. The ECMWF EFI has anomalies of 0.9 to 0.95 for high temperatures across the Columbia and Foothills of the Blue Mountains on Tuesday and 0.8 to 0.9 for lows. EFI also has 0.7 to 0.8 for highs on Wednesday. && .PRELIMINARY POINT TEMPS/POPS... PDT 97 62 91 55 / 0 10 10 0 ALW 96 66 90 60 / 0 0 10 0 PSC 100 64 94 59 / 0 0 0 0 YKM 99 63 94 58 / 0 0 0 0 HRI 100 64 93 58 / 0 0 10 0 ELN 95 61 89 57 / 0 0 0 0 RDM 94 52 86 45 / 20 20 0 0 LGD 92 59 85 52 / 0 10 20 10 GCD 93 57 86 50 / 20 40 30 10 DLS 94 63 86 57 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...Heat Advisory until 9 PM PDT this evening for ORZ041-044-507-508- 510. WA...Heat Advisory until 9 PM PDT this evening for WAZ024-026>029. Red Flag Warning until 8 PM PDT this evening for WAZ690-691. && $$ SHORT TERM...77 LONG TERM....77 AVIATION...95

906 FXUS65 KREV 100930 AFDREV Area Forecast Discussion National Weather Service Reno NV 230 AM PDT Tue Jun 10 2025 .KEY MESSAGES... * Isolated thunderstorms are possible from NE California to near the Oregon border, and in Mineral County this afternoon. * Hot and dry weather will prevail this week with slightly cooler temperatures by the weekend. * Wind impacts to travel and recreation likely this week with periods of elevated to critical fire weather conditions in the afternoons. && .DISCUSSION... Broad high pressure across the West will dampen today as weak low pressure traverses the Pacific Northwest. Dry southwest flow will overspread the region in response, scouring upper moisture and reducing thunderstorm chances this afternoon. The most likely area for isolated storms is from northern Lassen County into the Surprise Valley and far northern Washoe County where odds reach 30-60%. Strong outflow gusts will serve as the main concern, accompanied by small hail, brief downpours, and lightning. A stray thunderstorm or two cannot be ruled in Mineral County this afternoon, although far lesser odds of 5-10% resides here. Summer-like heat will continue through Wednesday, featuring daytime highs in the 80s and 90s. However, today begins a steady cooling trend that culminates in more typical 70 and 80 degree highs by Friday. Breezy winds are expected each afternoon this weekend, peaking on Friday and Saturday. These windier conditions may impact travel and recreation, as well as elevate fire concerns across the region (see Fire Weather discussion below). Otherwise, plan on typical June warmth and dry weather this week and over the weekend. -Salas && .AVIATION... Shallow fog may result in periods of IFR/LIFR conditions at KTRK through 14-15Z this morning. A drier weather pattern settles in today, result in widespread VFR conditions with breezy westerlies (G20-30kts) in the afternoon. FL100 winds marginally increase to around 25 kts throughout the day, which may be sufficient for low- end LLWS and mountain wave turbulence impacts for Tahoe and Sierra Front terminals this evening. -Salas && .FIRE WEATHER... A ridge breakdown sequence that begins today will result in elevated to locally critical conditions below 6000` each afternoon through Thursday. Red Flag conditions are possible along the Sierra Front and across western Nevada Friday and Saturday afternoons when winds are strongest. As winds increase, there may be flare-ups of holdover ignitions from recent lightning. * Today through Thursday: RH reductions to 10-15% is expected this afternoon for elevations generally below 6000` with further drying supporting afternoon RH`s of 5- 12% from Wednesday into the weekend. While winds will likely remain below Red Flag criteria until Friday, SW/W gusts of 20-30 mph (think our typical zephyr breezes) will overlap with very low afternoon RH today through Thursday. Poor overnight recoveries will compound fire concerns across western Nevada where RH struggles to exceed 30-40%. * Friday and Saturday: Winds will likely be strongest Friday and Saturday afternoons, elevating the fire weather threat into Red Flag conditions along the Sierra Front and much of western Nevada. There is still some uncertainty in the magnitude of the winds on both days, but confidence is increasing in seeing at least a 3-6 hour period of critical conditions each respective afternoon. -Salas && .REV Watches/Warnings/Advisories... NV...None. CA...None. && $$

062 FXUS66 KSTO 091943 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1243 PM PDT Mon Jun 9 2025 For additional details on weather and expected impacts over the next 7 days, please visit weather.gov/sto/briefing. .DISCUSSION... .SYNOPSIS... Isolated shower/thunderstorm chances over higher terrain persist today and Tuesday primarily north of Interstate 80 as the split flow regime aloft begins to deteriorate. Broad zonal flow is then expected to set up across interior NorCal through the remainder of the week, with troughing arriving into next weekend. As a result, an overall stagnating weather pattern of predominantly dry weather, near normal temperatures, and breezy onshore flow looks to persist. && .KEY MESSAGES... * Heat Advisory in effect through 11 PM PDT tonight for portions of the northern Sacramento Valley and adjacent mountains/foothills. * Today-Tuesday: -Widespread Moderate HeatRisk across interior NorCal and areas of Major HeatRisk across the northern Sacramento Valley today, dissipating to areas of Moderate HeatRisk by Tuesday. --Probability of Valley High Temperatures > 95F: ---Northern/Central Sacramento Valley: 80-100% Today, 60-90% Tuesday ---Delta, S. Sacramento Valley, N. San Joaquin Valley: 20-50% Today & Tuesday --Probability of Valley High Temperatures > 100F: ---Northern/Central Sacramento Valley: 60-90%, Today -Periodically breezy onshore flow, strongest in the Delta and vicinity during the afternoons and evenings. -Chances for isolated afternoon/early evening showers and thunderstorms: --Today: 15-30%, across Sierra/southern Cascades north of Interstate 80 and northern Sacramento Valley and surrounding terrain. --Tuesday: 5-15%, across Shasta County mountains * Wednesday-Sunday: -Gradual cooling trend expected through the remainder of the week. Primarily Minor HeatRisk as temperatures become more seasonable. -Probability of Valley High Temperatures > 90F: --Northern/Central Sacramento Valley: 60-90% Wed-Thu, 30-50% Fri-Sun --Delta, S. Sacramento Valley, N. San Joaquin Valley: 50-80% Wed-Thu, 20-40% Fri-Sun -Onshore flow expected to persist with periods of breezy winds, mainly in the afternoons and evenings and strongest across the Delta and vicinity. -Ensemble uncertainty in a trough digging southward from the Gulf of Alaska next weekend persists. Current trends indicate a continuation of seasonable and breezy weather anticipated at this time. .Changes from previous forecast... -No notable forecast changes since last update. && .AVIATION... VFR conditions expected at Valley TAF sites next 24 hours, with possible MVFR/IFR conditions in isolated mountain and foothill t-storms from around 20z today through 05z Tuesday. Mostly onshore flow in the Valley/Delta, with surface winds at or below 15 knots. Period of gustier surface winds from around 21z through 16z Tuesday, with surface gusts up to 25 knots possible. && .STO WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 11 PM PDT this evening for Northern Sacramento Valley-Shasta Lake Area / Northern Shasta County. && $$

390 FXUS65 KMSO 100706 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 106 AM MDT Tue Jun 10 2025 .DISCUSSION... KEY MESSAGES: - Near-record daytime high temperatures today. - A few strong storms this afternoon and again Wednesday afternoon and evening. - Cooler late this week with daily afternoon showers and thunderstorms. Hot temperatures will continue across the Northern Rockies today, with many locations approaching daily record highs. The ridge axis does shift eastward today, allowing southwesterly flow to develop over the region. This pattern will support the formation of scattered afternoon/evening showers and thunderstorms. Model guidance highlights the most likely areas for storm development along the Divide and into southwest Montana. Any storms that form this afternoon could produce gusty, erratic winds, with stronger cells generating gusts up to 50 mph. This southwesterly flow continues into Wednesday as two weak disturbances move through the area. The first is expected to pass from southern Idaho County into Lemhi County and southwest Montana during the morning, bringing scattered showers and possibly an isolated thunderstorm. A second disturbance will follow a similar path in the afternoon and may trigger additional thunderstorms. These storms could produce locally heavy rainfall, small hail, and gusty winds. Looking ahead to Thursday and into the weekend, the southwest flow aloft persists. While temperatures will ease compared to earlier in the week, highs will still reach the mid-70s to 80s or around 10 degrees above normal for this time of year. Daily afternoon and evening showers and thunderstorms remain likely, especially along the Continental Divide extending into Lemhi County. && .AVIATION...Hot temperatures continue today but the ridge of high pressure will begin to shift east this afternoon, opening the door for a developing southwesterly flow pattern. This shift will bring modest mid-level moisture and instability, supporting the development of afternoon showers and thunderstorms along the Continental Divide. Activity may impact terminals such as KSMN and KBTM between approximately 10/2000Z and 11/0200Z with vicinity shower potential at remaining terminals. Watch for gusty outflow winds to near 40 kts near stronger showers and thunderstorms. Thunderstorms dissipate this evening but showers and isolated thunderstorms return Wednesday morning, especially from I-90 southward as a weak disturbance pushes through. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...Heat Advisory until 9 PM PDT Tuesday for Lower Hells Canyon/Salmon River Region...Orofino/Grangeville Region. && $$

026 FXUS65 KBOI 101538 AFDBOI Area Forecast Discussion National Weather Service Boise ID 938 AM MDT Tue Jun 10 2025 .DISCUSSION...Upper ridge over the interior western US will maintain hot weather today, but Wednesday should be about 10 degrees cooler as a Pacific trough comes in. Heat Advisory currently in effect for the Lower Treasure Valley will continue until 10 PM MDT tonight. Current satellite imagery suggests a weak short wave trough over southern ID and northwestern Nevada, with radar showing light showers in sw Owyhee County but only virga in south-central ID. Scattered thunderstorms will develop over higher terrain this afternoon, most strongly in southern Harney County where instability will be greatest. DCAPE as much as 1000 J/kg will support strong outflow winds and blowing dust, but little rain from these thunderstorms. A minor update was made for slightly greater coverage of thunderstorms today and tonight. The stronger Pacific short wave trough will arrive Wednesday with more numerous showers and thunderstorms, but weaker outflow winds. We are considering a Flash Flood Watch for Wednesday in our Idaho zones especially north of the Snake Basin. More on that in the afternoon package. && .AVIATION...Mainly VFR. High density altitude this afternoon due to hot temperatures. Isolated to scattered thunderstorms across E Oregon and the higher terrain of SW Idaho this afternoon, expanding into lower valleys of SW Idaho this evening. Thunderstorms may create outflows up to 50 kt and blowing dust. Surface winds: W-NW 5- 15 kt, except gusty and erratic near thunderstorms. Winds aloft at 10kft MSL: SW-W 5-15 kt. KBOI...VFR. High density altitude this afternoon due to heat. 20% chance of thunderstorms after Wed/00Z producing outflows up to 45 kt and blowing dust. Outflows may travel from distant thunderstorms and impact KBOI (50% chance). Surface winds: NW 7-12 kt. && .PREV DISCUSSION... SHORT TERM...Today through Thursday night...An upper level ridge remains over the area. A shortwave off the Oregon coast will slowly move inland and aid in shower and thunderstorm development this afternoon as monsoonal moisture moves northward from the Great Basin. Temperatures today will be similar to yesterday with mid to upper 90s in the lower valleys. A heat advisory remains in effect for the Lower Treasure Valley through 10pm MDT Tuesday. With the heating of the day and the approaching shortwave, showers and thunderstorms will form over eastern OR late this afternoon. DCAPE values with the heating will be around 1000 j/kg which favors gusty outflow winds up to 55 mph this afternoon and evening. Areas of blowing dust with these outflows as well, and high resolution models have the outflows traversing long distances into SW Idaho this evening, including the Treasure and Magic Valleys. The shortwave will slowly track across Oregon, keeping a threat of thunderstorms through the night. Precipitable water values reach the 95th percentile for this time of the year on Wednesday as the shortwave moves through the area. Plenty of effective bulk shear and CAPE for severe thunderstorm development with rotating updrafts capable of producing hail up to 1 inch, and downpours on Wednesday afternoon. Still concerned about the possibility of debris flows from recent fire burn scars, such as the Wapiti. Wind gust potential Wednesday will be less than Tuesday because of a wetter atmosphere and cooler temperatures. Temperatures cool around 10 degrees on Wednesday. A cold front will stall out from Burns OR to McCall ID on Thursday. There is enough instability on Thursday afternoon for isolated showers and thunderstorms to form along the front, but substantially weaker than the storms on Wednesday. LONG TERM...Friday through Tuesday...Both deterministic and ensemble models are in good agreement of southwest flow aloft dominating through the majority of the long term, with a upper- level trough set up off the west coast. There will be a slight chance (15-25%) of showers and thunder (10-20% chance) over the higher terrain of northeast Valley County on Friday afternoon. Otherwise, our area will remain dry through Monday. This can be attributed to the lack of moisture, with precipitable water values roughly ranging from the 15th to 30th percentile through Wednesday. While there may be some shortwaves embedded within the southwesterly flow, right now it is looking like increased clouds will be the only impact. Beyond Monday afternoon, deterministic and ensemble models alike diverge on solutions. More specifically, how they handle the trough and its progression inland. Regardless of specifics, there is an indication of the trough progressing inland early next week. This introduces a slight chance (15-30%) of showers across higher terrain in Baker County and the central Idaho mountains. Temperatures through the long term stay 5-10 degrees above normal with little daily variations. Temperatures drop to near normal on Tuesday; however, there is more uncertainty regarding Tuesday`s temperatures as it will depend on how the trough progression unfolds. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...Heat Advisory until 10 PM MDT this evening IDZ012. OR...Heat Advisory until 10 PM MDT /9 PM PDT/ this evening ORZ064. Red Flag Warning from 1 PM MDT /noon PDT/ this afternoon to 6 PM MDT /5 PM PDT/ Wednesday ORZ672-673. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise DISCUSSION...LC AVIATION.....ST SHORT TERM...KA LONG TERM....NF

328 FXUS65 KLKN 100741 AFDLKN Area Forecast Discussion National Weather Service Elko NV 1241 AM PDT Tue Jun 10 2025 .KEY MESSAGES... Updated at 1241 AM PDT Tue Jun 10 2025 * 15-20% chance for scattered showers and thunderstorms Tuesday afternoon and 25 to 30% across northern Elko and Humboldt Counties Wednesday afternoon with light precipitation amounts. * Above normal temperatures in the upper 80s and 90s. * Areas of Moderate HeatRisk Tuesday. && .DISCUSSION... (Today through next Tuesday) Issued at 1241 AM PDT Tue Jun 10 2025 WEATHER PATTERN OVERVIEW: A thermal trough extending northward from the Desert Southwest will help initiate scattered showers and isolated thunderstorms once again this afternoon and evening, with most hi-res CAMS increasing convective coverage further north across the I-80 corridor to the state line as moisture finally propagates further northward from central Nevada, where it has been the past couple of days. With mean CAPE values of 300-500 J/kg, expect brief heavy downpours with gusty and erratic winds. Thunderstorms are expected to remain on the dry side with the probability for a tenth of an inch or more of rainfall still quite low at 15% or less across Elko and Humboldt Counties Areas of Moderate/Orange HeatRisk values once again today as above normal temperatures continue with highs in the upper 80s and lower 90s. Those sensitive to the heat should avoid strenuous outdoor activities during the afternoon and everyone should stay hydrated. Use appropriate sun protection and take breaks as needed. A shortwave trough and cold front will make their way across northern Nevada Wednesday afternoon with a 30% chance for thunderstorms across far northern Humboldt and Elko Counties, otherwise the warm conditions continue. These chances have increased slightly from yesterday as we move into the hi-res forecast window. Little change into the extended period with long-range ensemble cluster scenarios all still in support of upper-level troughing moving closer to the Pacific Northwest Coast, with southwest flow aloft across the Great Basin and dry conditions with precipitable water values dropping below normal. Winds will also be on the increase as the center of the high pushes off to the east and southwest flow aloft develops. Wind gusts increase to 25 to 30 mph each afternoon Wednesday through Sunday. Slight increase in precipitation chances as the ridge breaks down into next week and the trough slides across the northwestern U.S. FORECAST CONFIDENCE & DEVIATIONS: Low confidence in timing and coverage in showers and thunderstorms this afternoon and Wednesday afternoon. High confidence in above normal temperatures and HeatRisk. Moderate to high confidence in dry conditions from Thursday into this weekend with high pressure in control. Into early next week, some long-range ensemble clusters maintain a stronger trough as it rides northward around the ridge across the southwestern U.S., which would bring a slight increase in chances for light precipitation to far northern Nevada. Confidence is still very low in any appreciable rainfall with less than 20% of long range members in this cluster. A dry forecast through the next week, overall. && .AVIATION... (06Z TAFS) VFR conditions prevail at all terminals through Tuesday evening. High based thunderstorm activity at all terminals except for KTPH is forecast beginning midday on Tuesday and lasting through the early evening. Gusty and erratic winds in and around thunderstorms is possible. Afternoon diurnal gusty winds are also expected at all terminals out of the west-southwest ranging 20-25KTs. Gusty winds will diminish after sunset Tuesday evening. && .FIRE WEATHER... A mix of wet and dry thunderstorms are expected in most of Northern and Central Nevada this afternoon into this evening. A few of these thunderstorms could be strong. The primary thunderstorm hazards will be wind gusts near 45 mph and dangerous cloud to ground lightning strikes. Scattered, dry thunderstorms are anticipated in Northern Elko County Wednesday afternoon into Wednesday evening. A few of these thunderstorms could be strong to severe. The primary thunderstorm hazards will be wind gusts near 55 mph and dangerous cloud to ground lightning strikes. Dry and tranquil weather will prevail Thursday through next Tuesday. && .LKN WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...84 AVIATION...99 FIRE WEATHER...87