523 FXUS66 KSEW 260326 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 826 PM PDT Sat Apr 25 2026 .SYNOPSIS... Mostly dry and mild conditions will continue over the next week across western Washington as an upper level ridge remains over the region. && .SHORT TERM /TODAY THROUGH MONDAY NIGHT/... Western Washington is wedged between a broad upper trough over the Northern Rockies and an upper ridge centered well offshore. The end result is northerly flow at the surface and aloft. The air mass is cool and quite dry with widespread dew points in the 20s. This will allow temperatures to fall to near freezing across south Puget Sound and the Southwest Interior overnight. Hence, there is a frost advisory in effect. The overall synoptic pattern doesn`t change significantly on Sunday apart from a slight bump in heights and lighter north flow near the surface. We`ll see another mostly sunny day and slightly warmer temperatures. A weak disturbance will produce some cloud cover and cooler temperatures Monday and Tuesday, but stronger upper ridging is still on track to rebuild midweek allowing a few spots south of Seattle to make a run at 70 degrees. No public updates expected tonight. 27 Northerly flow aloft will continue over western Washington through the weekend as an upper level ridge builds offshore. This will maintain mostly dry conditions across the region with a warming trend into Sunday. However, mostly clear skies tonight into Sunday morning may allow for continued cold low temperatures which may cause frost to develop along the Puget Sound southward. Otherwise, western Washington will see warming conditions under mostly sunny skies into Sunday. Temperatures cool several degrees on Monday as a weak shortwave passes over the area, bringing increased onshore flow. This system will bring cloudy skies to much of the region, with chances for light showers over higher terrain. && .LONG TERM /TUESDAY THROUGH FRIDAY/... Northwest flow will develop aloft on Tuesday as a high pressure ridge builds offshore. This will allow for another day of near- normal temperatures and cloudy skies, with chances for showers continuing over the mountains. The ridge axis will shift inland on Wednesday and Thursday, bringing warming and clearing to the region, with temperatures nearing 70 degrees east and south of the Puget Sound on Thursday. By Friday, a cutoff low is forecast to develop along the west coast, but models show large differences over the placement of the low. This will influence conditions across western Washington, so for now the forecast for Friday and beyond remains uncertain. 15 && .AVIATION...An upper ridge will remain offshore through the weekend, with troughing over the Intermountain West. This will result in continued northerly flow aloft. Light to weak onshore flow tonight into Sunday morning. Predominantly clear skies with VFR for the interior sites through Sunday. There remains approximately a 35 to 40% chance of LIFR/IFR cigs for KHQM generally between 12 to 18z on Sunday. Onshore flow will then increase Sunday night into Monday for a more widespread stratus push inland. North winds will weaken this evening, becoming light tonight into Sunday. W/NW winds increase Sunday afternoon. KSEA...Clear conditions expected through the TAF period. North winds 5 to 10 kts this evening will decrease below 5 kts mainly after 06- 07z. NW winds increase again Sunday afternoon. JD && .MARINE... High pressure will remain over the coastal waters, with lower pressure inland. North flow (offshore at times) will transition to more of an onshore pattern early next week. Models have a couple pushes down the Strait of Juan de Fuca Sunday evening and Monday evening, but the probability of gusts reaching small craft advisory thresholds is low at this time. The outer coastal waters may see breezy gusts up to 20 kt Monday/Tuesday, with a possible system end of the week producing breezy winds across more of the waters. Additionally, low clouds/fog Sunday morning along the Pacific Coast may reduce visibilities at times to mariners. Seas this weekend hold around 4-6 ft, and increase to 6-8 ft Monday through next week. HPR && .HYDROLOGY... No river flooding is expected over the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...Frost Advisory from 11 PM this evening to 10 AM PDT Sunday for City of Seattle-Lowlands of Lewis and Southern Thurston Counties-Lowlands of Pierce and Southern King Counties- Olympia and Southern Puget Sound-Southern Hood Canal. PZ...None. && $$

819 FXUS66 KPQR 260515 AFDPQR Area Forecast Discussion National Weather Service Portland OR 1015 PM PDT Sat Apr 25 2026 .SYNOPSIS...Dry conditions are favored across the inland valleys through the week with no noteworthy weather impacts going forward. High temperatures remain near or slightly above seasonable normals through Tuesday. However, we do have to watch for some light shower chances early next week, primarily in the Cascades and coast range. Drier and potentially warmer temperatures return Wednesday to Friday as high pressure builds overhead although forecast uncertainty increases mid to late week as well. && .DISCUSSION...Today through Friday...Dry northerly flow presides across the region tonight through the remainder of the weekend with fairly normal late April conditions persisting. Similar to the previous night, we`ll still need to keep an eye on low temperatures in regard to frost concerns, especially in the Upper Hood River Valley, where mostly clear skies, light winds, and a weak offshore gradient keeping a drier airmass in place likely facilitates efficient radiational cooling. High confidence temperatures bottom out in the low to mid 30s come sunrise Sunday morning in the area so a Frost Advisory is in effect again tonight. Otherwise, low temperatures are expected to be a couple degrees warmer across the broad for the rest of the region tonight helping to mitigate frost concerns elsewhere (like the southern Willamette valley). The upper-level pattern turns more northwesterly Monday through Tuesday with weak upper-level shortwave troughs rotating into the Pacific Northwest from a parent low located over south- central Canada. These weak upper-level features combined with an influx of low to mid level moisture (surface to 800mb) likely increases our chances for light showers, mainly focused over terrain which can provide orographic lift. Chances for showers on each of these days peak around 5-10% along the I-5 corridor and 20-35% across the Cascades and Coast/Coast Range - this is a decrease from previous forecasts as guidance has trended drier. Due to the added cloud cover and onshore flow, daytime temperatures early next week cool down a few degrees compared to this weekend with highs in the mid 60s across interior valleys. Wednesday to Friday, the majority of ensemble members suggest upper level ridging builds over the northeast Pacific and shift into the Pacific Northwest. Most ensemble members also show above-average 500 mb heights over the area, suggesting warmer temperatures by mid to late next week. There still remains some uncertainty on the exact progression, strength, and placement of the ridge axis, thus leading to a wide range of high temperatures. The last high end max temperatures (NBM 90th percentile) for Thursday and Friday next week are currently in the low 80s across interior valleys. Chances for exceeding 80 degrees on Thursday are still around 30-50% across the Portland/Vancouver Metro and 15-30% for the rest of the I-5 corridor. Meanwhile, low-end (NBM 10th percentile) max temperatures for Thursday and Friday are in the low to mid 60s. At least precipitation chances through this period remain rather low, 10-20% coast range/Cascades and 0-5% inland valleys into the end of the week. -99/10 && .AVIATION...VFR conditions expected to persist throughout the period at inland terminals with calm to light and variable winds overnight building out of the northwest at 5-10 kt after 18-20z Sun and few fair weather cumulus above 5 kft. Efficient cooling in the Upper Hood River Valley between 08-16z could lead to temperatures in the low to mid 30s, allowing for potential frost development over metal surfaces. Along the coast, a renewed push of marine stratus will more likely result in cigs lowered to MVFR/IFR levels by 12z Sun. Confidence in cig restrictions is highest near KONP (90% chance of MVFR, 60% chance of IFR) and decreases to the north (70% chance of MVFR, 50% chance of IFR at KAST). While daytime mixing may lift or break up cigs by 19-21z Sun, MVFR conditions remain favored through the day at KONP. A stronger push late in the period, 00z Mon or later, will bring increased chances of MVFR/IFR cigs again. As inland, calm to light and variable winds overnight will build out of the northwest at 5-10 kt by 19-21z Sun. KPDX AND APPROACHES...High confidence in persistent VFR conditions beneath largely clear skies. Northwest winds around 5 kt will continue to ease into tonight, becoming light and variable by 12z Sun, then build out of the northwest to 6-8 kt after 18z Sun. -36 && .MARINE...High pressure remains over the waters into Sunday, maintaining north to northwesterly winds. Winds shift more westerly on Monday into Tuesday morning as a weak front moves over the waters. By Tuesday evening, high pressure returns over the waters through the end of the week, returning northerly winds. Winds expected to remain under 20 kts this week. Seas of 5-7 ft persist through next week with a northwesterly swell. -03/10 && .PQR WATCHES/WARNINGS/ADVISORIES... OR...Frost Advisory until 8 AM PDT Sunday for ORZ121. WA...None. PZ...None. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

777 FXUS66 KMFR 260511 AFDMFR Area Forecast Discussion National Weather Service Medford OR 1011 PM PDT Sat Apr 25 2026 ...Updated the Aviation and Marine Sections... .AVIATION...26/06Z TAFs...Overall, VFR conditions will prevail through the TAF period for most locations. Showers and isolated thunderstorms are present from the Mt Shasta region and areas eastward, producing periods of MVFR conditions and terrain obscurations. Showers will continue overnight, but once they clear, areas of MVFR ceilings will likely linger across far northeastern CA into Sunday morning. Showers and isolated thunderstorms are expected again Sunday afternoon in many of the same areas, but may also spread north just over the state line and along areas of higher terrain. Along the coast, marine stratus will return to the coastal waters and along the coast/coastal valleys. Expect MVFR/IFR ceilings to return around 06-08z and persist into Sunday morning, before clearing back to VFR by late morning or early afternoon. && .MARINE...Updated 800 PM PDT Saturday, April 26, 2026...High pressure offshore and a low pressure trough along the coast will maintain gusty north winds today. Advisory level winds are expected through this evening south of Cape Blanco, resulting in continued steep seas due to wind waves combined with a low background northwest swell. North winds will persist through the week, but the pattern weakens some Sunday into Monday, resulting in less steep seas and improved conditions through early Tuesday. Northerly winds increase again late Tuesday, especially south of Cape Blanco, and persist through much of the week. Steep seas could return around mid-week due to increasing wind waves and another 4-6 ft northwest swell moving into the waters. High end advisory level winds are possible late in the week, with areas of gales south of Gold Beach also possible. /BR-y && .PREV DISCUSSION... /Issued 146 PM PDT Sat Apr 25 2026/ KEY MESSAGES... -Slightly cooler weather continues this weekend (and into Mon) with isolated to scattered showers from the Cascades eastward. -Isolated pm/eve thunderstorms are also possible, but primarily across NorCal (Mt Shasta region eastward). -Showers chances are lower west of Cascades, but can`t rule one out here or there Sun/Mon, especially higher terrain. -Activity shifts eastward Tue/Wed with warming trend Wed- Fri. -Next increased chance of showers is next Saturday. DISCUSSION...Satellite imagery this afternoon is very revealing of the upper air pattern across the Northwest United States. A thin veil of high thin cirrus is dropping southward across southern Oregon at this time and is the leading edge of an upper trough digging into WA/OR. Meanwhile, cumulus developing across NorCal are indicative of increased mid-level moisture and instability associated with another upper trough moving onshore just south of San Francisco. As these two areas come together this afternoon/evening, we expect showers and isolated thunderstorms to develop, mainly from the horn of Trinity County (that juts northward into southern Siskiyou County) eastward across the Mt. Shasta region (near and south of Medicine Lake) and into Modoc County. Moisture available in these areas isn`t that impressive, generally PWs of around 0.50 of an inch or so. Neither is instability, for that matter (~250 J/KG). But, due to the persistent alignment of the upper flow (W->E), activity could redevelop over the same areas well into the evening. The highest probability of this occurring is to the south in Shasta/northern Lassen counties. Even so, some of the stronger cells that develop could bring brief downpours (in addition to cloud to ground lightning, gusty winds and even pea- size hail) around Mt. Shasta City, Dunsmuir, McCloud, Day, Lookout and Adin. While a shower or two can`t really be ruled out farther north, that`s where most of the activity will be through tonight and even perhaps into Sunday morning. With the trough axis overhead on Sunday, showers/isolated t-storms continue in NorCal. There is a little better chance of showers extending into southern Oregon, but these will be mostly focused near elevated heat sources (mountains/higher terrain), where the best instability is located. Valley PoPs will be generally 10% or less. Overall, temps the next 2 days will be near to slightly below normal -- with the lowest maxTs compared to normal in areas where the most cloud cover/precip is -- in eastern Siskiyou/Modoc counties. Snow levels this weekend could drop to around 5000 feet, but any snow accumulations will be minimal and confined to the higher mountains around Mt. Shasta and also the Warners. Activity Sunday should wane after sunset with the loss of instability. By Monday, with a kicker trough swinging southward just offshore, the main trough axis will push east of the Cascades. There could still be pm/eve showers over the East Side then, but most areas will be dry with seasonable temperatures. Onshore flow could lead to the development of stratus along the coast both Monday and Tuesday mornings, especially north of Cape Blanco. Depending on the depth of the moist layer, this may impact portions of the Umpqua Basin as well. A strong upper ridge is forecast to develop and move into the area mid-late next week and this will bring a period of dry and warmer weather with high temperatures (areas inland from the coast) generally 10-15F above normal for late April and early May. Coastal areas could continue to experience intrusions of late- night/morning marine stratus. Latest 12z long range deterministic guidance is hinting at the potential for a trough to approach the coast by next weekend with the possibility of showers and thunderstorms. But, ensemble guidance is split on this with a majority (60%) of members maintaining a dry pattern. -Spilde && .MFR WATCHES/WARNINGS/ADVISORIES... OR...None. CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory until 5 AM PDT Sunday for PZZ356-376. && $$

806 FXUS66 KEKA 260706 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1206 AM PDT Sun Apr 26 2026 .SYNOPSIS...Isolated showers and thunderstorms are possible in the interior each afternoon through Monday. Drier weather returns mid next week. && .DISCUSSION...A deep marine layer will once again bring widespread coastal stratus this morning. A shortwave moving through the area may support some drizzle along the coastal areas this morning as well. Most interior shower activity this morning will generally remain east of the area, though a stray light rain shower in eastern Trinity County. Dew points have dropped as drier air arrives behind these showers and are in the low to mid 30s in Trinity County. Frost may be possible in the coldest valleys of Trinity County with lows possibly as low as the mid 30s. Confidence is low with cloud cover from nearby showers along with potential low cloud cover. Showers and isolated thunderstorms are possible again in the afternoon and evening over Trinity, eastern Mendocino, and northern Lake. Instability has waned somewhat over recent model runs, but still a few lightning strikes are possible. High-res models show areas of moderate to locally heavy rain rates over the higher terrain in eastern Trinity, eastern Mendocino, and far northern Lake Counties. HREF is showing around 50% chance for over a half inch of rain in these areas. Showers will taper off in the evening and overnight. Additional showers are possible again for the interior areas Monday afternoon and evening. Instability currently looks meager, so thunderstorms are less likely. Drier and warmer weather is likely to return by mid next week as ridging redevelops. JB && .AVIATION...A very deep although weak marine layer has blanketed the coast (and even much of the interior) in MVFR ceilings around 2 kft overnight. The marine layer is particularly robust for the southern half of the area, covering nearly all of Mendocino County in 3kft ceilings. Ceilings over the interior will quickly lift to VFR in the morning, but will cling longer to the coast, with a 60% chance of MVFR ceilings all day in Crescent City and around Humboldt Bay. Regardless of clearing, stratus will again resurge along the coast Sunday night. /JHW && .MARINE...North winds in the outer water will continue to weaken Sunday, leaving gentle winds in all water sand short period seas falling below 6 feet by the afternoon. Meanwhile, a minor mid period westerly sell will continue to build in up to 4 feet by Sunday evening. Gentle winds will generally continue Monday with the swell rapidly decaying. Northerly winds will begin to return to southern waters Monday night and spread into the northern waters by Tuesday. steep short period seas will build in response at least in the outer waters. Though strongest in the outer waters, short period wave energy will begin to impact the inner waters mid week. Winds will continue to increase late weak with a 75% chance of near gale conditions by Thursday in the outer waters. /JHW && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 7 AM PDT this morning for PZZ470- 475. && $$ 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

457 FXUS66 KMTR 260534 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1034 PM PDT Sat Apr 25 2026 ...New SHORT TERM, LONG TERM... .KEY MESSAGES... Updated at 1031 PM PDT Sat Apr 25 2026 - Drizzle and light rain continue into early Monday Morning. - Warming and drying into the work week. - Possible light rain next weekend. && .SHORT TERM... Issued at 1031 PM PDT Sat Apr 25 2026 (Tonight through Monday) Most of the radar returns for rain have moved into the Central Valley, but some of the rain gauges are picking up a few hundredths of rain. This will likely be the theme for much of the night in the Bay Area and Central Coast: light rain and drizzle, barely showing up on radar. Shorter-term, high-res models agree on waves of light rain through the night with moments of drizzle possible in between. Rain chances reduce slightly into Sunday, but coastal drizzle and pockets of light rain will be possible with overcast skies. This added moisture and lack of sunshine will make Sunday the coolest day of the forecast, with most populated area just barely breaking into the 60s and some of the interior mountains staying in the 40s. Sunday night into Monday sees a slight increase in light rain and drizzle chances, but these chances look to erode and exit into late Monday morning. Overall accumulations from the weekend precipitation will stay on the light and non-impactful side. Cloud cover lingers through much of Monday, and along with good onshore flow, temperatures will stay on the cooler side. Highs on Monday look to be only a few degrees warmer than Sunday, and may arrive later in the day as cloud cover tries to thin before sunset. && .LONG TERM... Issued at 1031 PM PDT Sat Apr 25 2026 (Monday night through next Saturday) Skies look to clear in the early night on Monday, but some marine stratus looks to form into Tuesday morning, supported by a modest marine layer. From there, the overall pattern gets into an interesting mix. Ridging to the north, with a cutoff low to the south will lead to an active wind environment out to sea, but will greatly vary the weather overland. Coastal and slightly inland areas will see modest increases in temperature, but the reforming marine layer will provide cloud cover and more moisture in the air, preventing too much of a warm up. Areas outside of the marine layer will see more of the affects from the ridge, leading to much more notable warming. Highs look to climb into the 80s for the interior areas by the mid to late week, while the coast looks to peak in the 60s and the slightly inland areas build into the low 70s. Longer term models hint at another trough digging into California coast next weekend. The increased onshore flow and cloud cover will call for cool conditions once again, along with some light rain. These chances for rain could be on the fragile side since the model guidance looks ..odd.. in the Pacific jetstream pattern. However, as odd-looking as the pattern looks, models are in ..oddly.. good agreement in the 200+ hour forecast. This`ll be something to keep an eye on as the forecast develops, but maybe we`re not done with rain just yet! && .AVIATION... (06Z TAFS) Issued at 917 PM PDT Sat Apr 25 2026 500 mb low center exits to the east, while 500 mb troughing continues late tonight and Sunday. A weak surface cool front also moves in from the northwest late tonight and Sunday morning. VFR- MVFR remains in the forecast with a few areas of light drizzle and/or showers tonight and Sunday. Vicinity of SFO...VFR-MVFR. A few showers developing tonight and Sunday morning. Southwest wind 5 to 10 knots tonight through Sunday morning then gusting to 20 knots Sunday afternoon and early evening. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...VFR-MVFR. Light coastal drizzle and/or showers tonight and Sunday. Variable wind directions mainly less than 10 knots tonight and Sunday morning becoming westerly near 10 knots Sunday afternoon and early evening. && .MARINE... (Tonight through next Friday) Issued at 913 PM PDT Sat Apr 25 2026 Moderate west to northwest breezes will continue through the middle of next week before increasing to a fresh to strong northwest breeze. These stronger winds will build rough seas of 8-10 feet in exposed waters. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ SHORT TERM...Murdock LONG TERM....Murdock AVIATION...Canepa MARINE...Canepa 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

518 FXUS66 KOTX 260722 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 1222 AM PDT Sun Apr 26 2026 .KEY MESSAGES... - Chilly overnight temperatures with sensitive vegetation susceptible to frost and freeze damage through this weekend. - Afternoon showers over primarily the mountains through Tuesday. Small potential for thunderstorms over the Idaho Panhandle today and Monday. && .SYNOPSIS... Afternoon showers mainly over the mountains through Tuesday. Chilly overnight temperatures with morning frost through Monday. Temperatures then see a gradual warming trend through the rest of the week. && .DISCUSSION... Today through Wednesday night: The Inland Northwest will remain on the back edge of a broad longwave trough of lower pressure. This places the region in a north to northwest flow pattern aloft. Weak shortwave impulses will push across at times over the next few days, but will largely have a minor influence on our weather. Moisture will increase gradually starting today. This will increase the potential for diurnally forced showers. Best chances of between 30-50% will be over the mountains and more specifically over the higher terrain of northeast Washington and the Idaho Panhandle. The atmosphere will be marginally unstable for a one hit wonder of a thunderstorm or two over the Idaho Panhandle for this afternoon and again Monday afternoon. Minimal if any lightning activity is anticipated. A few showers may creep into the Spokane Area as they drift off of the higher terrain to the north. There will be a minor push of wind through the Cascades late Monday. This will reinforce an increase of Pacific moisture back to what we typically see for April. Northwest drainage winds will be noticeable across the Wenatchee area for Monday evening, as well as on Tuesday, but not of concern for impacts. Overnight temperatures continue to be on the chilly side Sunday night into Monday morning. Borderline for additional frost to be observed for the Wenatchee Area, Moses Lake Area, lower Asotin- Garfield County and Lewiston Area. Will have the next shift tomorrow take a closer look at the potential for frost to decide on another frost advisory for early Monday morning. Will then see temperatures warming up enough by Monday night into Tuesday morning that frost for these areas in their growing season won`t be as much of a concern. Thursday through Sunday: The longwave trough shifts east away from the region with a longwave ridge of higher pressure moving in to take its place over the Northwest. This will result in a general warming trend with temperatures warming above normal. Model ensembles are if fairly good agreement with a shortwave disturbance riding over the top of the ridge around Friday. The general consensus is that this disturbance will be too weak to give the region much of a shot of moisture, and there doesn`t appear to be much of a reflection of this energy down to the surface. Without much of a change in the air mass in the wave of cold air advection, I don`t see much wind accompanying this weather impulse either. Most likely we`ll just see some passing clouds and it won`t have much impact on the temperatures either. Model ensembles diverge further into next week. Most scenarios of about 60-80% show a upper level trough digging over the eastern Pacific and closing off an upper level low that then shifts onshore. This low may push onshore anywhere from northern California to Washington. This creates a greater degree of uncertainty for the potential of showers and temperatures depending on where this upper low tracks (if it even materializes). It wouldn`t bring anything more than minor impacts if it does happen to form and push into the Northwest in the way of potentially some afternoon thunderstorms. The warmer temperatures will result in high elevation snow melt in the Cascades and in the mountains of Canada that feeds some of our mainstem rivers. These rises will be fairly minor. The one exception is the Stehekin River which will continue to run high and impact the Stehekin community there. /SVH && .AVIATION... 06Z TAFS: Moisture will start to increase a bit more into the Inland Northwest over the next couple of days and this will result more in the way of convective shower activity with diurnal heating. Afternoon showers will largely remain over the higher terrain. There is a 10-15% chance for isolated thunderstorms over the Idaho Panhandle this afternoon. Winds will be light, but decaying showers may result in an outflow that impacts airports over northeast Washington and the Idaho Panhandle including Colville, Deer Park, Sandpoint, Spokane, and Coeur d`Alene (K63S/KDEW/KSZT/KGEG/KSFF/KCOE). FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence for VFR conditions. There is a small chance (less than 30%) for afternoon showers over the mountains of northeast Washington to drift into the Spokane Area around mid to late afternoon (after 21Z) and impact KGEG/KSFF airport terminals. /SVH ----------------------- 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 57 33 61 40 62 40 / 10 10 10 10 10 0 Coeur d`Alene 55 33 58 38 59 39 / 30 10 20 10 20 10 Pullman 55 32 57 38 59 39 / 10 10 20 10 20 0 Lewiston 60 37 62 41 64 43 / 10 10 20 10 10 0 Colville 60 28 63 36 66 38 / 20 10 10 10 20 10 Sandpoint 52 32 56 37 57 39 / 50 20 20 10 40 20 Kellogg 52 32 55 38 57 39 / 60 20 40 20 60 10 Moses Lake 65 36 69 41 69 41 / 0 10 0 0 0 0 Wenatchee 64 40 67 45 67 44 / 10 10 0 0 0 0 Omak 63 35 66 41 69 43 / 0 0 10 0 10 0 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...Frost Advisory until 8 AM PDT this morning for Lower Garfield and Asotin Counties-Moses Lake Area-Wenatchee Area. ID...Frost Advisory until 8 AM PDT this morning for Lewiston Area. && $$

494 FXUS66 KPDT 260510 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1010 PM PDT Sat Apr 25 2026 .KEY MESSAGES... - Near-freezing overnight/Sunday morning in the Columbia Basin and along the Blue Mountain foothills - Slight chance of showers each day through Tuesday, mainly over the mountains - Gradually warming to near or above normal through next week && .DISCUSSION... Water vapor imagery shows a couple upper-level lows over or near the CONUS this afternoon. The most impressive low is a deep closed low over the Canadian Prairies and northern Great Plains. Meanwhile, a weaker low is located just offshore of central California. A shortwave trough embedded within northerly flow aloft on the west side of the aforementioned deep closed low is sliding south over the Pacific Northwest. Under the shortwave, clear to partly skies are present across the lower elevations, while the mountains have seen scattered to numerous cumulus develop. A few isolated showers are evident within the cumulus field, but not anticipating any robust convection today given the lack of any deep CAPE profiles. Tonight into Sunday morning, there is a low-medium probability of observing freezing temperatures again across the Columbia Basin and along the Blue Mountain foothills. The best chances (30-60 percent) lie in the Pendleton area with lower (20-40 percent) chances extending outward across the rest of the aforementioned region including the Yakima and Kittitas valleys. Given that forecast cloud cover from CAMs is in the FEW-BKN range, confidence is a bit lower in a widespread freeze compared to this morning when mostly clear to clear skies were present, and have held off on issuing any freeze headlines. Have included a mention of frost in the forecast for areas with temperatures near or below freezing, though. Looking ahead, ensemble NWP guidance is in agreement that additional weak shortwaves will dive southward through Sunday, providing additional weak forcing for showers, mainly over the mountains with lower chances (10 percent or less) extending across the lowlands. Flow aloft looks to turn more northwesterly by Monday and Tuesday, with a couple shortwaves and weak diurnally driven instability (CAPE of 500 J/kg or less) providing impetus for isolated to scattered showers, mainly over the mountains. Wednesday through the remainder of the week, ensemble cluster analysis shows 500-hPa heights rising to near or above normal over the Pacific Northwest and vicinity, with roughly 80-90 percent of members placing dry conditions region-wide. Roughly half of members do show hints of a trough or closed low moving over southern Canada or the Northern Tier late Thursday or Friday, but confidence in it providing precipitation to the forecast area is low (10-20 percent). 86 && .AVIATION /06Z TAFS THROUGH 06Z MONDAY/... VFR conditions will persist through the forecast period. Winds will stay below 10 kts. CIGs of 25kft this through the evening, decreasing to 10-15kft for KDLS/KYKM/KRDM/KBDN after 16-18Z. 90 && .Preliminary Point Temps/PoPs... PDT 33 62 39 65 / 0 0 0 10 ALW 38 62 42 65 / 0 10 10 20 PSC 35 67 40 71 / 0 0 10 0 YKM 37 67 38 69 / 0 10 10 0 HRI 33 66 40 69 / 0 0 0 0 ELN 33 62 35 64 / 0 10 10 10 RDM 25 59 29 61 / 0 0 10 0 LGD 31 57 33 59 / 0 10 10 40 GCD 28 56 32 58 / 0 10 0 40 DLS 40 69 43 67 / 0 10 10 0 && .PDT WATCHES/WARNINGS/ADVISORIES... WA...None. OR...None. && $$ DISCUSSION...86 AVIATION...90

211 FXUS65 KREV 260847 AFDREV Area Forecast Discussion National Weather Service Reno NV 147 AM PDT Sun Apr 26 2026 .KEY MESSAGES... * Cool, showery and breezy conditions prevail today with isolated afternoon thunder and minor snow impacts for Sierra passes. * Shower and thunder chances slowly decrease Monday and Tuesday, with a gradual warming trend. * Expect drier and warmer weather for mid-late week, then shower chances may return by late next weekend. && .DISCUSSION... The upper low that brought areas of light mountain snow and valley rain to Mono-Mineral counties is departing eastward into south central NV. Meanwhile, a broader low pressure trough currently producing rain showers in northeast CA will drop southward across much of CA/NV this afternoon and persist through early this week. Cold air aloft associated with this trough will bring increased instability for scattered showers and isolated thunderstorms this afternoon, favoring areas from Susanville- Pyramid Lake-Fallon northward where chances for thunder increase to near 25%. With the cooler air mass keeping highs mainly in the 50s today for lower elevations, some of these storms will be capable of producing minor accumulations of pellets/very small hail. Along the Sierra, upslope flow will support shower bands mainly near and west of the crest with snow levels between 5500-6000 feet this morning edging up to 6000-6500 feet this afternoon. While snow accumulations will be sparse during the daytime hours, a well-placed band could bring light amounts up to 2" and slick travel for the main Sierra passes (Donner/Echo summits) especially for the morning or evening hours. Across the remainder of western NV, shower coverage will be more sparse this afternoon. Thunder chances for the eastern Sierra into western NV from Reno-Fallon southward are lower, generally 10-15%. Brisk west-northwest winds with afternoon gusts 25-35 mph will make today more fall-like, with isolated choppy conditions on area lakes. For Monday, a near-repeat of afternoon shower activity is anticipated, although instability decreases compared to today with best chances for thunder (15-20%) east of US-95 in west central NV, and generally around 10% elsewhere. Shower coverage and precip amounts decrease in comparison to today, while snow levels in the Sierra edge upward to near 7000 feet by Monday afternoon, limiting travel impacts over the main passes. This trough pattern is projected to hang on through Tuesday, and high resolution guidance shows another round of isolated afternoon showers mainly near the Sierra. As temperatures warm up by 5-10 degrees above Monday`s highs and Sierra snow levels rise to 7500-8000 feet, snow travel impacts are not expected for main passes. From Wednesday-Friday, a high pressure ridge builds into CA/NV and continues the warming trend, with highs climbing to near 80 degrees for lower elevations and near 70 for Sierra communities by the end of the week. Dry weather and lighter winds will also prevail, although cumulus buildups may yield a slim 5-10% chance of brief showers each afternoon near the Sierra crest. Next weekend looks to start out warm and mainly dry, but medium range guidance is hinting at another closed upper low dropping into the western US. Confidence is lower on this system`s track, with some scenarios tracking the low farther west/off the west coast. At this time, our forecast indicates a return of shower/isolated thunder chances and a few degrees of cooling by Sunday. MJD && .AVIATION... Rain and mountain snow showers continue to be the main weather concern for the region today and Monday, favoring the Sierra terminals where brief periods of MVFR/IFR in -SHRASN could begin as early as 17-18Z and continue until 03Z each day. For western NV terminals, VFR conditions likely prevail through Monday, although expect periods of terrain obscuration each afternoon with showers in the vicinity. Low-end risk for isolated thunder affecting the main terminals (10-15% chance) between 20-02Z this afternoon, then edging downward to around 10% for the similar time frame Monday afternoon. West breezes increase today with gusts 25-30 kt for western NV terminals and around 20 kt for Sierra terminals mainly between 18-04Z, followed by lighter winds (gusts 15-20 kt) Monday. FL100 wind gusts of 30-35 kt could produce isolated mountain wave turbulence this afternoon-evening. MJD && .REV Watches/Warnings/Advisories... NV...None. CA...None. && $$

517 FXUS66 KSTO 251822 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1122 AM PDT Sat Apr 25 2026 .KEY MESSAGES... - Light mountain showers and isolated thunderstorms this afternoon and evening into early next week, best chances over Shasta County and mountain areas. - Temperatures trend cool for weekend, a little above normal and dry mid to late next week. && .DISCUSSION... ...Today-Sunday... Isolated showers, thunderstorms, light snow, and breezy winds today from a trough passage through California, apart of a larger low pressure system over the West into Central Canada. Overall, precipitation has trended wetter today but still looking for only minor travel impacts. Hi- res modeling show showers and convection beginning early this afternoon and linger into the overnight hours. Showers will continue through Sunday morning with another round of thunderstorms on Sunday, mainly confined to Shasta County. Overall, impacts are limited by lack of organized convection and peak convection window occurring after daytime energy is on the downtrend and shear values on the weaker side of things. Current totals show 0.25-0.75" over the mountains and 0.50-1.50" over Shasta County, highest over Eastern Shasta County. Additionally, south winds gusts up to 15-25 MPH today and tomorrow (Sunday), strongest in the afternoon hours. With that being said, any developed thunderstorms carries the risk of lightning, small hail, and rain showers so exercise caution if commuting and find the latest road conditions at quickmap.ca.dot.gov. Lastly, minor snow accumulations expected as showers develop over the mountains. Current forecasts have 1-4 inches over the Sierra, up to 6-8 inches over Lassen and peaks south of Hwy. 50. Snow levels decrease late this afternoon to around 5500-6500, then persist through Monday before snow tapers off. Travel impacts should be limited, with slippery roads at times. ...Next Week... Lingering showers continue over the Sierra on Monday with dry conditions to follow through much of the work week. Highs will be in the 70s in the Valley and foothills, with cooler mid to upper 40s to 50s for the higher elevations. Temperatures trend higher and more seasonable mid to late week with low 80s across the Valley by Wednesday and afternoon breezy weather across the Delta. && .AVIATION... Areas of MVFR conditions possible in mountain showers or isolated thunderstorms this afternoon into early next week, extending into portions of the Valley and foothills this weekend. Elsewhere, VFR conditions expected next 24 hours except for possible MVFR ceilings at the Sacramento area sites after 10z-12z Sunday. Periods of breezy southerly to southwesterly gusts up to 15-20 kts in the Valley and up to 20-30 kts over the mountains until around 00z-03z Monday. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$

933 FXUS65 KMSO 260857 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 257 AM MDT Sun Apr 26 2026 .DISCUSSION... KEY MESSAGES: - Frost possible in the mornings through mid week - Slow warming trend with lingering showers, especially during the afternoon and evening Freezing temperatures across much of the region this morning may damage sensitive vegetation and exposed outdoor plumbing. Freeze Warnings and Frost Advisories remain in effect through mid- morning. Although overnight temperatures will moderate this week, frost or freezing conditions remain possible each morning. Light snow showers will develop this morning across northwest Montana, bringing some light snow primarily to the terrain near the Continental Divide, but also briefly into the valleys, such as the Flathead valley. A cool, northerly flow will persist through early next week, keeping temperatures below seasonal averages. While a gradual warming trend is expected, readings will likely not reach normal levels until Wednesday. This pattern will also support daily scattered showers, particularly across western Montana. These showers will be most widespread during the afternoon and early evening hours, diminishing after sunset. Minor disturbances within this flow will focus more persistent precipitation along the Continental Divide near Glacier National Park. Travelers should prepare for the potential of isolated snow- covered roads during the overnight and early morning hours. This is particularly relevant for southwest Montana this evening, where high mountain passes, including Homestake and MacDonald Passes, may see snow accumulation and slick travel conditions. A shift toward drier and significantly warmer weather is anticipated for the latter half of the week. High pressure building over the region will likely push temperatures approximately 10 degrees above normal. However, this period of warmth appears temporary, as long-range guidance suggests another weather disturbance may arrive by next weekend. && .AVIATION...VFR conditions will be prominent today, though localized MVFR/IFR impacts are expected as scattered rain and snow showers develop. Activity will begin across northwest Montana this morning, specifically impacting KGPI with reduced ceilings and visibility through 26/1700Z. This activity will then spread across western Montana and the higher terrain of North Central Idaho this afternoon. Diurnal heating will maximize shower coverage and intensity during the late afternoon and evening. Terrain obscuration and icing will be primary concerns, particularly along the Continental Divide and over southwest Montana passes (Homestake/MacDonald), where snow showers may lead to slushy accumulations on runways. Surface winds will remain out of the northeast to east today, with the strongest gusts focused across northwest Montana and the Flathead Valley. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...Freeze Warning until 8 AM MDT this morning for Bitterroot/Sapphire Mountains...Flathead/Mission Valleys... Kootenai/Cabinet Region...Lower Clark Fork Region... Missoula/Bitterroot Valleys. ID...Freeze Warning until 8 AM MDT /7 AM PDT/ this morning for Eastern Lemhi County...Northern Clearwater Mountains... Southern Clearwater Mountains. Frost Advisory until 8 AM MDT /7 AM PDT/ this morning for Orofino/Grangeville Region...Western Lemhi County. && $$

628 FXUS65 KBOI 260851 AFDBOI Area Forecast Discussion National Weather Service Boise ID 251 AM MDT Sun Apr 26 2026 .KEY MESSAGES... - Afternoon rain and snow showers over higher terrain through Tuesday - Gradually warming temperatures through the forecast && .SHORT TERM /Through Tuesday Night/... A very slow moving upper trough will keep weather cooler and unsettled as it moves eastward. Each afternoon today through Tuesday, marginal moisture and instability will support scattered showers in higher terrain of Eastern Oregon, Central Idaho, and the southern highlands. Enough afternoon instability will be present for stray lightning in showery areas. Most of the system`s moisture will be northeast and south of us, increasing precipitation chances just outside our forecast area. Heights and thickness values rise as the system moves east, bringing a gradual warming trend. Temperatures about 5 degrees below normal today rise to near normal by Tuesday, and continue to climb in the long term. && .LONG TERM /Wednesday through Sunday/... A final weak shortwave impulse will move across the area on Wednesday as the parent longwave trough over the Upper Midwest moves east. This feature will bring a 20-30% chance of showers to the mountains with dry conditions elsewhere. Temperatures will be near to slightly above normal. A broad upper level ridge will move over the region Thursday and Friday, continuing the warming trend. Highs by Friday will be nearly 10 degrees above normal, reaching the mid 70s in lower elevations. The ridge will also bring dry conditions and light winds. Forecast confidence decreases over the weekend as an upper level trough approaching the West Coast weakens the ridge. Ensembles vary considerably on the track and strength of the trough. For now, temperatures are favored to remain 10-15 degrees above normal, but could trend cooler if the trough is stronger and moves overhead. Precipitation chances tick up over the weekend, reaching 10-30% by Sunday with a 10% chance of thunderstorms. && .AVIATION /06Z Sunday through Monday/... Issued 1126 PM MDT SAT APR 25 2026 VFR under mid to high clouds. Scattered showers will continue over the Owyhee Mtns and near the NV border overnight through early morning. Snow levels 4-6kft MSL. Surface winds: mostly variable under 10 kt overnight through early morning. Breezy NW winds 10-15 kt with gusts 20-30 kt will return over most areas in the afternoon through sunset. Winds aloft at 10kft MSL: SW-W 5-15 kt. KBOI...VFR with scattered high clouds. Surface winds: variable under 7 kt overnight through Sunday morning, then becoming NW 10-15 kt with gusts up to 25 kt in the afternoon. && .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...JM LONG TERM....ST AVIATION.....JY

795 FXUS65 KLKN 260703 AAA AFDLKN Area Forecast Discussion...Updated National Weather Service Elko NV 1203 AM PDT Sun Apr 26 2026 .KEY MESSAGES... * Periods of valley rain and mountain snow today through Monday afternoon * A few strong thunderstorms possible both this afternoon and Monday afternoon * Cooling trend today and Monday && .UPDATE... Issued at 1203 AM PDT Sun Apr 26 2026 The current forecast is on track. No updates are planned. && .DISCUSSION... (Today through Saturday) WEATHER PATTERN OVERVIEW: A shortwave trough will move across Nevada today, with high temperatures in the 50s. Increasing chances for more showers, still mainly across Central Nevada, with Austin seeing a 40% chance of 0.1 or more inches of rain, while Ely, Eureka, and Tonopah are seeing a 50% chance of up to 0.25 or more inches of rain. Thunderstorm probabilities more widespread across Nevada with the highest chance of 25% of thunderstorms over the US-50 corridor, however, thunderstorm development may be hindered as CAPE values still remain low between 100-150 J/kg. Snow levels will be slightly lower, but remain high fluctuating between 6500-7500 feet. Overnight, the upper trough will still be over Nevada, keeping chances for additional light accumulations with lows in the 30s. Monday, upper trough will begin to move eastward out of Nevada, with some lingering showers overhead with 15-35% chance of showers over Central Nevada, while Northern Nevada sees an increase of up to 10- 20% for 0.1 inches of rain. By the afternoon, chances increase to its highest between 15-30% across eastern Nevada with Ely seeing up to 50% chance for additional 0.1 inches of rain. Precipitation chances begin to dissipate Monday evening and clear out overnight with lows in the 20s to 30s. Tuesday through the rest of the week, some lingering showers will hang around during the day but are not expected to accumulate much. Quieter weather conditions expected through the week as models show a potential rex block pattern forming over the western CONUS with high pressure near the Canadian border and the low pressure near the Mexican border. Due to locations of the weather systems, winds will be light with a warming temperature trend returning high temperatures into the 70s by mid-week. && FORECAST CONFIDENCE & DEVIATIONS: High confidence of shower activity across Central Nevada today through Monday. Moderate confidence of thunderstorms today. Moderate confidence of a rex block pattern forming over western CONUS mid-week, with low confidence on the pattern lasting long. High confidence of warming trend returning during the week. No changes were made to the NBM grids at this time. && .AVIATION... VFR conditions over the next 24 hour period for all northern terminals. Low pressure system will bring moisture over the state with greatest amounts in Central Nevada. VFR conditions to start at all central terminals, however VCSH and -RA conditions expected this afternoon and evening, which may bring MVFR or lower conditions. Overnight, VCSH near KEKO and KBAM, but is not expected to impact the terminals. CIG levels around FL100 is expected to drop between FL025 and FL060 as the system moves further into Nevada. Light southerly/southwesterly winds at or below 10 kts, with some occasional gusts up to 18 kts at central terminals and KEKO until until dissipating to light winds this afternoon. && .LKN Watches/Warnings/Advisories... None. && $$ DISCUSSION...97 AVIATION...97