447 FXUS66 KSEW 030942 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 242 AM PDT Thu Apr 3 2025 .SYNOPSIS...High pressure will build into the region through the remainder of the week, allowing conditions to dry out and warm up. Wet and cooler conditions are on track to return by the end of the weekend as troughing settles into the Pacific Northwest. && .SHORT TERM /TODAY THROUGH SATURDAY/...Latest radar imagery shows light shower activity east of the Puget Sound and along the Pacific Coast early this morning slowly tapering off as dry northerly flow develops aloft. Temperatures will continue to lower into the 30s this morning with areas of patchy frost possible mainly south of the Puget Sound through Lewis County. As drier air continues to move into the region throughout the day, sky cover will clear by the afternoon with highs peaking today in the mid to upper 50s. High pressure will continue to amplify and shift inland into the weekend, with high temperatures reaching the 60s across the lowlands by Friday with plenty of sunshine across the interior. Temperatures will follow a warming trend into Saturday, with areas along the Cascade Foothills reaching highs in the lower 70s. As the next storm system slowly approaches, cloud cover will increase throughout the day Saturday but with plenty of sun breaks. .LONG TERM /SUNDAY THROUGH WEDNESDAY/...The next chance for widespread precipitation increases throughout the day Sunday as high pressure moves eastward and a front moves inland across the Pacific Northwest. Southwest flow will maintain mild temperatures in the 60s across the lowlands with snow levels between 6000-7000 feet on Sunday. A cold front will push inland late Sunday into Monday, maintaining widespread showers as temperatures cool and snow levels lower. Moist westerly flow will continue through the first half of next week, with periods of breezy winds, persistent rainfall over the lowlands, and periods of accumulating mountain snow. 15 && .AVIATION...Variable to southeasterly flow early this morning, with largely MVFR to VFR cigs. The exception being PWT in IFR likely through 12Z. Conditions will be monitored at CLM, HQM and OLM as well as there is potential for reductions in cigs through the early morning hours as well. Expect a transition to north/northwest flow early this afternoon between 5 and 7 kts across most terminals, generally after 20Z. Cigs will remain VFR through the period as high pressure settles into the region. KSEA...MVFR and VFR conditions are present early this morning, with light southerly flow at 4 to 5 kts. This will persist through much of the morning hours before VFR cigs return for the rest of the TAF period. A transition to northwesterly flow is likely after 20Z today, with speeds in the 5 to 7 kt range through 23Z, increasing slightly to 7 to 8 kts after 00Z. Speeds look to drop back to around 5 kts after 03Z. 21 && .MARINE...Surface high pressure will continue to build offshore, easing marine winds and seas through the rest of the week. Benign conditions will continue through the weekend, before a frontal system approaches the waters Sunday evening. Here, we will likely see elevated winds and seas return to the coastal waters. Combined seas 3 to 5 feet through the rest of the week and into the weekend. Seas will start to gradually build upwards by Sunday ranging from 9 to 12 feet. 21 && .HYDROLOGY...No river flooding is expected over the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...None. && $$

392 FXUS66 KPQR 031037 AFDPQR Area Forecast Discussion National Weather Service Portland OR 337 AM PDT Thu Apr 3 2025 .SYNOPSIS...Mild and dry across the area today with temps near seasonal normals in the upper 50s. Clearing skies will pave the way for chilly temps and potential widespread frost formation tonight into Friday morning. Warm and dry conditions expected Friday and Saturday with highs in the 70s in the interior valleys. Cooler and more showery weather returns Sunday into early next week. && .SHORT TERM...Now through Saturday Night...Radar shows a few isolated showers lingering across parts of northwest Oregon and southwest Washington as a weak upper level disturbance departs the region. Broken mid level cloud cover has helped to keep fog development at bay as of 3 AM Thursday, with temperatures generally in the upper 30s to low 40s across the interior lowlands. Will continue to see remaining shower activity dissipate through this morning as drier northerly flow takes hold and makes for a seasonably mild and pleasant day across the area, with afternoon highs in the upper 50s to around 60 degrees. The primary short term forecast concern remains the potential for more widespread frost formation tonight as clearer skies and more efficient radiational cooling allow temperatures to drop into the mid or even low 30s across much of the interior lowlands. Opted to issue a Frost Advisory tonight into Friday for much of the Willamette Valley and the Upper Hood River Valley as confidence continues to increase for low temperatures in the 33-36 degree range, with the coldest spots expected to be in the southern Willamette Valley. Excluded most of the Portland/Vancouver metro area from the advisory as temperatures will likely remain in the upper 30s, but the advisory does cover the Tualatin Valley and outlying areas of Clark County in WA where temperatures are more likely to dip into the mid 30s. Friday and Saturday still look warm and dry with ample sunshine as high pressure builds over the Pacific Northwest. NBM probabilistic guidance continues to indicate about a 50/50 chance for temperatures to reach 70 degrees in the Portland area on Friday, but only around a 20% chance in the rest of the Willamette Valley. Saturday will be the warmest day of the week as NBM probs to reach 70 climb above 90% for most of the valley. Coastal areas will remain more mild as they retain a marine layer influence through Saturday. /CB .LONG TERM...Sunday through Wednesday...Medium range guidance has started to come into better agreement on the arrival of the next trough on Sunday as the upper level ridge shifts east of the Cascades. As a result, the forecast has trended cooler and wetter for Sunday with increasing precipitation chances and NBM 50th percentile temperature guidance residing in the low to mid 60s in the interior lowlands. Expect a benign pattern characterized by mild temperatures and showery weather to persist during the first half of next week as ensemble clusters depict upper level troughing over the NE Pacific and broad onshore flow across the Pacific Northwest. Models do not indicate any significant weather impacts across the region within the next seven days. /CB && .AVIATION...Radar, satellite, and surface observations as of early Thursday morning show predominately low-end VFR CIGs (3-5 kft) with isolated showers. Confidence is low for fog development this morning due to widespread broken/overcast CIGs. Saturating low levels could lead to MVFR CIGs (2-3 kft) between 12-18z Thu in the Willamette Valley (30-50% probability). However, if some areas end up clearing, fog/mist could develop as winds across the region are calm or light and variable. If fog/mist develop, this could lead to LIFR/IFR VIS and CIGs, especially in areas near bodies of water and within sheltered valleys. The probability of LIFR/IFR conditions due to fog development is 10-30% in the Willamette Valley between 12-16z Thu. Any fog that develops should clear out after 16-18z Thu. Otherwise, expect VFR thresholds through the TAF period. A high pressure ridge will build over the Pacific Northwest today, bringing dry conditions with clearing skies by this afternoon. Winds generally northerly to northwesterly today around 5-10 kt. PDX AND APPROACHES...Predominately VFR thresholds through the TAF period with a 30-50% chance for MVFR CIGs between 12-18z Thu. If skies clear out this morning, fog development is possible (10-30% probability for this scenario). Otherwise, VFR thresholds through the rest of the TAF period with northwest winds around 5 kt or less. -Alviz && .MARINE...High pressure over the northeast Pacific and lower pressure inland will maintain northerly to northwesterly winds under 15 kt through the end of the week. Seas will generally be 3 to 5 ft through Saturday. The next front arrives Saturday evening into Sunday, returning breezy southerly winds across all waters. As the front approaches, there is a 20-30% probability for Gale- force southerly wind gusts up to 35 kt on Sunday. As the front approaches the waters, seas will build towards 11 to 13 ft as a fresh westerly swell pushes into the waters. Another strong ebb is expected this (Thursday) morning for the Columbia River Bar; however, seas with this ebb are forecast around 4 to 5 ft so minimal impacts expected. -Alviz && .PQR WATCHES/WARNINGS/ADVISORIES... OR...Frost Advisory from midnight tonight to 9 AM PDT Friday for ORZ109-113>118-121. WA...Frost Advisory from midnight tonight to 9 AM PDT Friday for WAZ205. PZ...None. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

018 FXUS66 KMFR 031006 AFDMFR Area Forecast Discussion National Weather Service Medford OR 306 AM PDT Thu Apr 3 2025 .DISCUSSION...Dry northerly flow will set up over the area today. However some of the high res models and CAMS Convective allowing models) that shows radar reflectivity shows isolated showers popping up in portions of Lake and Modoc County during the day. We`ll have another day of seasonably cool afternoon temperatures and decreasing cloud cover west of the Cascades. It will breezy this afternoon east of the Cascades as stronger winds aloft mix down near the surface. It will be dry warmer Friday and Saturday as upper ridging builds into the area, with warmer afternoon temperatures. Mid-upper 70s are in the forecast for West Side Valleys with mid to upper 60s for East Side locations. An upper trough and front will approach the area late Saturday night. Precipitation will reach the coast late Saturday night, then gradually move inland west of the Cascades Sunday morning into Sunday afternoon. It`s possible some precipitation could make it east of the Cascades Sunday afternoon. The majority of the ECMWF ensemble members and operational ECMWF keep the bulk of the precipitation along and west of the Cascades. In contrast, the operational GFS and ensemble members brings the precipitation farther east Sunday afternoon. The clusters are in pretty good agreement with the upper pattern similar to the ECMWF solutions. Therefore the forecast for Saturday night into Sunday will lean towards keeping the eastside dry into Sunday afternoon. The front will move inland Sunday evening as a shortwave trough acts as a "kicker" pushing the front inland, followed by post frontal showers Sunday night into Monday. We could catch a brief break in the action Monday night, but the upper flow will be westerly, with another but weaker front pushing into the area Tuesday morning. The best chance for precipitation Tuesday should be along the coast, coastal mountains, Cascades, and north of the Umpqua Divide. 500mb heights will increase Tuesday evening and night, with precipitation diminishing and shifting north. All signs are pointing towards dry and mild weather Wednesday and Thursday, followed by a weak front Friday. -Petrucelli && .AVIATION...03/06Z TAFs...Light scattered showers continue but are decreasing across the area tonight. VFR levels are expected to prevail through most of the TAF period. Slight chances of development remain for Roseburg and Klamath Falls. Guidance has backed away from fog in the Umpqua Valley tonight, replacing that outcome with a period of MVFR ceilings. Timing for possible fog in Klamath Falls has also been included in the TAFs. Confidence in both of these possibilities is slight to moderate at best, but they are included in the absence of other activity. VFR levels are expected to continue across the area through the day Thursday. -TAD && .MARINE...Updated 300 AM Thursday, April 2, 2025...Seas are expected to be around 6 to 9 feet at 9 seconds today with north to northwest winds generally in the 10-25 kt range. As a result, a Small Craft Advisory is in effect today out to 20 NM from shore off Cape Blanco, and extending to 60 NM from shore off Pt. St. George. A period of improving conditions is expected Friday through Saturday. Thereafter, a building long period (17-20 seconds) west swell is anticipated on Sunday, and this will likely lead to steep seas and hazardous conditions over the waters. -Guerrero && .MFR WATCHES/WARNINGS/ADVISORIES... OR...CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory from 11 AM this morning to 3 AM PDT Friday for PZZ356-376. && $$

156 FXUS66 KEKA 022203 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 303 PM PDT Wed Apr 2 2025 .SYNOPSIS...Few isolated showers continue to diminish as a cold upper low progresses south. Clearing and drying will allow for some colder overnight lows. A sharp warmup with building high pressure can be expected for the end of the week, followed by some rain chances. && .DISCUSSION...A cold upper low continues to pass south of the forecast area and into the Four Corners Region this afternoon. Wrap- around moisture is generating some light showers over mainly Humboldt and Del Norte counties, and that activity will fade tonight. As with last night, lingering moisture, dissipating cloudcover, and some patchy fog formation will hold up overnight temperatures for some, particularly where additional light showers occurred today. Overall, the area has dried out more than the last 24 hours, and areas of frost and subfreezing temperatures are expected in portions of areas where the agricultural growing season has begun. Frost Advisories and Freeze Warnings are out in Southern Mendocino and Lake counties. Interior Humboldt will be watched closely, as the agricultural season has begun, but confidence is low on the coverage of frost potential at this time given the previously described conditions. On Thursday, a ridge of high pressure will begin amplifying over the NE Pacific and into the Western CONUS. The pressure gradient will increase against the departing upper low and northerly winds will increase to breezy levels, with gusts of 18 to 25 mph in the exposed ridges and coastal headlands in response. For Friday, the ridge progresses over W CONUS when abundant warmth will ensue. There are indications an inverted trough may form with favorable positioning for enhanced offshore winds and perhaps higher temperatures than forecast. Currently, daytime highs of around 5 degrees above climatological norms are forecast, with low 60s at the coast and low 70s for the interior valleys. Saturday may be the apex of warmth, with daytime highs nearing 10 degrees above average, with some mid 70s for interior valleys. Cloud cover arriving ahead of the short wave trough may inhibit the full potential of warmth for some. The shortwave will be the first of two systems that will deliver light rainfall to the region late Saturday through Monday, and maybe into Tuesday. Snow levels look to be high, at 4500 to 5000 ft, and snowfall does should not be an issue. The proximity of the low to the low will determine the strength of the southerly winds, and NBM is still struggling to resolve meaningful probabilities of wind gusts over 25 mph through that period. There are some ensemble solutions that portray a stronger 925mb low level jet and heavier rainfall, and there is high uncertainty in 24 rainfall amounts from ensemble spread (1-2 inches difference). Probabilities for 24 rainfall over 0.5 inch are currently moderate to high (46 to 75%). /JJW && .AVIATION...Improving weather, under drying northerly flow, rendered the TAF sites mostly VFR today. However, widely scattered, diminishing showers continued to lurk off the Humboldt Coast and interior areas through early afternoon. Infrequent MVFR Cigs have been associated with showers. Winds across the region shifted more to the WNW-N this afternoon. Due to a micro "bubble" high over CEC, the wind gradient was slower to develop until around 1300 LST (20Z). In the meantime, winds were already gusty at UKI and ACV airports. At the coast, winds will diminished somewhat tonight, but should stay relevant enough to prevent any marine layer development under a northerly gradient flow. Winds will be light overnight at UKI. Therefore light fog is possible for a short period of time Thursday morning, but seems unlikely at this time (Wed Afternoon). /TA && .MARINE...Fresh to moderate northerlies will persist tonight through Thu evening. Strongest north winds are initially forecast to occur over the outer waters and in the lee of Cape Mendocino inside 10NM tonight. Generally, 15-25 kt is forecast with gusts up to 30 kt. The largest steep waves of 6-8 ft are also expected across the southern waters. Diurnal wind max is forecast to expand northward on Thu with HREF probabilities of 30-60% for gale force gusts to 35 kt around and offshore of Pt St George Thursday afternoon and evening. Coverage of these gale gusts based on the HREF does not appear sufficient at this time to warrant a gale watch. Later runs of the CAMS could expand. Northern inner waters will be much more marginal for gusts to 21 to 24kt this afternoon and evening. Winds will likely lay down overnight and Thu morning before increasing again Thu afternoon in response to land mass heating. North winds should be stronger Thu afternoon and evening for the northern waters and a small craft advisory will be necessary as steep waves increase. Northerly conditions should begin to relax and ease up on Friday as a thermal trough shifts over the coastal waters. Steep wind waves around 5-7 feet will probably persist in the outer waters, however. Southerly winds are forecast to develop over the weekend in advance of a frontal system. NBM guidance continues with probabilities not more than 20% for gusts over 25 kt, so right now winds do not look to be very strong and impactful. A long period westerly swell group will build on Sunday and peak to 9 to 11 ft near 18 seconds by mid to late morning according to GFS-waves. GFS wind fields could be wrong and the swell overdone. Stay tuned as this swell may pose a risk for sneaker waves on Sunday. DB && .EKA WATCHES/WARNINGS/ADVISORIES... CA... Freeze Warning from 2 AM to 9 AM PDT Thursday for CAZ110- 111-114. Frost Advisory from 2 AM to 9 AM PDT Thursday for CAZ112- 113-115. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 9 PM PDT this evening for PZZ450. Small Craft Advisory until 9 AM PDT Thursday for PZZ455. Small Craft Advisory until 3 AM PDT Friday for PZZ470-475. && $$ 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

994 FXUS66 KMTR 030826 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 126 AM PDT Thu Apr 3 2025 ...New SYNOPSIS, SHORT TERM, LONG TERM... .SYNOPSIS... Issued at 123 AM PDT Thu Apr 3 2025 Gradual warming and drying trend through Saturday with a slight chance for rain Sunday. Warming and drying trend resumes Monday. && .SHORT TERM... (Today and tonight) Issued at 123 AM PDT Thu Apr 3 2025 A Frost Advisory is in effect through 9 AM for the North Bay Interior Valleys and the Interior Central Coast. This cold airmass will also be responsible for putting three climate sites daily minimum temperatures in jeopardy this morning: San Rafael (SARC1) forecast is 42 degrees with a previous record of 39 degrees in 2010, San Francisco Downtown (SFOC1) forecast is 44 degrees with a previous record of 41 degrees in 2001, and Oakland Museum (OAMC1) forecast is 44 degrees with a previous record of 43 degrees in 2003. Light winds and remnant moisture will allow for fog development through the morning hours, so ensure to use your low-beam headlights, drive slowly, and keep your distance from other vehicles. The warming and drying trend continues today, but temperatures will still remain several degrees below average. Cold conditions will return overnight largely remaining confined to the higher terrain; nonetheless, ensure the protection of people, pets, plants, and pipes. && .LONG TERM... (Friday through Wednesday) Issued at 123 AM PDT Thu Apr 3 2025 A high-amplitude longwave ridge of high pressure will build into the West from the Eastern Pacific Ocean through Saturday. At the surface, this will translate to the return of above seasonal normal temperatures and minor HeatRisk. As a reminder, this level of heat affects primarily those individuals extremely sensitive to heat, especially when outdoors without effective cooling and/or adequate hydration. An upper-level low will shift the ridge eastward (effectively flattening the pattern to zonal flow) Sunday into Monday with a cold front slated to bring precipitation of up to 0.25" to the North Bay. The ridge rebuilds and begins to retrograde Tuesday with temperatures climbing to as much as 15 degrees above average by Wednesday. && .AVIATION... (06Z TAFS) Issued at 1039 PM PDT Wed Apr 2 2025 Patchy MVFR CIGs along the coastline and Monterey Bay region with highest confidence in MVFR CIGs continuing to impact HAF and MRY. NBM is best representing the current satellite setup which shows cloud cover across the South Bay and interior Monterey County diminishing, decreasing confidence that CIGs will reach SJC or SNS. Some potential for fog during the early morning hours at STS and APC but confidence is low with local WRF guidance suggesting conditions will be on the drier end. Gusty onshore flow continues at OAK, SFO, and HAF but has diminished from earlier this afternoon. Winds continue to diminish overnight before widespread moderate onshore flow returns during the day tomorrow. Vicinity of SFO...VFR. Patchy MVFR CIGs are possible overnight but confidence is low. HREF and NBM guidance keep CIGs more directly along the coastline which should keep CIGs away from SFO. Gusty onshore flow will continue to diminish overnight before moderate west to northwest winds return during the day tomorrow. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Borderline VFR/MVFR conditions at MRY overnight, VFR at SNS. Low clouds continue in the vicinity of MRY with BKN CIGs hovering on the BKN030-035 border. Current thinking is CIGs will hover closer to BKN030 with temporary decreases to between BKN025-030 possible. CIGs look to remain slightly higher at SNS where VFR conditions persist through the TAF period. Onshore flow will continue to diminish overnight with moderate west to northwest winds expected during the day tomorrow. && .MARINE... (Tonight through next Tuesday) Issued at 1039 PM PDT Wed Apr 2 2025 A strong north to northwest breeze and rough seas continue over the coastal waters through early Friday morning. Winds will diminish heading into the weekend with a moderate to fresh breeze persisting into next week. Wave heights will continue to abate tonight into the weekend but are expected to build again Sunday into next week as the next round of moderate long period swell reaches the coastal waters. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Frost Advisory until 9 AM PDT this morning for CAZ506-516>518. PZ...Small Craft Advisory until 3 AM PDT early this morning for Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm- Pt Reyes to Pigeon Pt 0-10 nm. Small Craft Advisory until 3 AM PDT Friday for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm. && $$ SHORT TERM...Sarment LONG TERM....Sarment AVIATION...Kennedy MARINE...Kennedy Visit us at www.weather.gov/sanfrancisco Follow us on Facebook, X, and YouTube at: www.facebook.com/nwsbayarea x.com/nwsbayarea www.youtube.com/nwsbayarea

734 FXUS66 KOTX 030910 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 210 AM PDT Thu Apr 3 2025 .SYNOPSIS... A cool and unsettled weather pattern will persist through today with a warming and drying trend by the weekend. Early next week looks wet and cool again. && .DISCUSSION... Today: One more day of scattered showers and a 15% chance of afternoon thunderstorms. The final weather disturbances will move through on the backside of a very elongated trough stretching from Manitoba Canada to the desert southwest. The area of concern is extreme eastern WA and the Idaho Panhandle. Any showers could have brief heavy rain, breezy winds, small graupel and an isolated lightning strike. With the ridge building just off the west coast, we will see an increase in northerly winds across central WA through the day. There is a 60-75% chance of sustained winds of 15 mph down the Okanogan Valley and onto portions of the Waterville Plateau and Upper Columbia Basin. There is a 35-50% chance of sustained winds to 20 mph around Omak south to around Highway 2. There is a 40-50% chance of seeing gusts to 30 mph, and that is mainly for the Okanogan Valley. Temperatures will be in the upper 40s to mid 50s, with around 60 for the Moses Lake area. This is at or just a few degree below average. Thursday night through Friday night: Showers will wane through the evening hours across the central and southern ID Panhandle. Skies will clear and Friday morning will be chilly, with low temps in the mid 20s to around freezing. The clear to mostly clear skies will continue through the period. We will begin to feel the influence of the ridge and temperatures will warm several degrees over Thursday. Low temps for Fri night/Sat morning will still remain a couple degrees below average given the good radiational cooling. /Nisbet Saturday through Wednesday: The weekend will be gorgeous thanks to a high pressure ridge centered over the INW. Temperatures will be in the 60sw and 70s Saturday and Sunday. Changes are on the horizon Sunday night as the high pressure ridge shifts east into western Montana and weakens. Moist southwest flow returns and with that come rain changes for the entire region. Snow levels initially Monday morning around around 4500-6000` but lower to 3500-4500` by Tuesday morning. This will bring light snow to Stevens Pass overnight Monday into Tuesday with a 20% chance of 4+" by noon Tuesday. From Monday morning to Tuesday night, central WA has a 5-30% chance of 0.25"+ of rain, 30-50% chance for eastern WA, and 50-70% chance for north ID. Temperatures Monday and Tuesday will be in the 50s and 60s. Wednesday and Thursday next week look showery but warmer as clusters are in good agreement of another high pressure ridge building. /db && .AVIATION... 06Z TAFS: Light showers will drift southeast through the night clearing the Spokane and Coeur d`Alene area by 09z with little measurable rain anticipated. The light mid-level northwest flow accompanying the shortwave spawning these showers will have the potential to produce a 1000-2500ft stratus deck between Spokane and Pullman by Friday morning. GFS MOS guidance has advertised this potential off an on the last several hour. HREF probabilistic data gives Pullman a 50 percent chance of ceilings below 2000 feet between 14-17z and Coeur d`Alene a 40 percent chance. The most concentrated shower activity will occur over the Idaho Panhandle behind tonight`s shortwave with PROB30 chances for showers at Coeur d`Alene and Pullman from mid afternoon into early evening. /GKoch FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: Mid-level northwest flow is less favorable for low stratus development around Spokane than recent nights, but it still can`t be ruled out with a 30 percent chance on the HREF of ceilings below 2000ft. /GKoch ----------------------- Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance && .PRELIMINARY POINT TEMPS/POPS... Spokane 53 30 56 32 61 36 / 20 10 0 0 0 0 Coeur d`Alene 50 28 56 29 61 34 / 60 20 0 0 0 0 Pullman 49 30 54 31 59 37 / 50 10 0 0 0 0 Lewiston 55 34 59 34 65 40 / 30 10 0 0 0 0 Colville 53 27 57 30 61 34 / 30 10 0 0 0 0 Sandpoint 47 28 54 29 58 33 / 60 10 0 0 0 0 Kellogg 45 28 51 30 58 36 / 80 20 0 0 0 0 Moses Lake 60 31 62 34 66 39 / 0 0 0 0 0 0 Wenatchee 57 36 59 37 63 43 / 0 0 0 0 0 0 Omak 58 31 61 34 65 38 / 10 0 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. && $$

914 FXUS66 KPDT 031025 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 325 AM PDT Thu Apr 3 2025 .SHORT TERM...Today through Saturday...Based on the current satellite and radar imagery, the Blues and Lower Basin have few clouds passing through along with the crest of the WA/OR Cascades. With light winds and cold dry air, the cloud coverage will gradually decrease over the Blues and Lower Basin with mainly clear skies at the Cascades and central OR thus lowering temperatures. Precip activity gradually starts ceasing today as a ridge moves inland of the PacNW. Northern Blues and eastern mountains may have lingering mountain snow this morning but chances are low (<30%). With some troughing over the eastern mountains, isolated thunder could develop at the Wallowas this afternoon into early evening as well (<20% chance). Weak instability will inhibit thunderstorm development. Snow showers may continue lingering for the Wallowas through the rest of this evening, though with slight chances (<30%). Tonight onwards, the forecast area will be dry. Breezy winds (15-25 mph) will persist through this late evening from the increased northwesterly flow for the Kittitas Valley and the foothills of the Southern Blues. But, they might return tomorrow afternoon across the Cascades and Foothills of the Southern Blues (40-50% confidence). Winds will then become lighter Friday into Saturday before a frontal system arrives Sunday. Feaster/97 .LONG TERM...Sunday through Thursday...The period starts off wet before ridging tries to build in starting around the middle of next week. Guidance has shifted, however, towards making the potential ridge next week dirty in nature, which would inhibit warming and produce more lingering precip chances, primarily for the mountains. Consensus across models as of now is to lean toward a drier forecast Wednesday onward, but more PoPs have been introduced to the high mountains throughout the period compared to 24 hours ago. The main precip concern for the long term falls on Sunday night into Monday, where an upper-level trough is forecast to sweep through the PacNW. Snow levels will be elevated at above 6000 ft across the duration of most of the precip, so no real snow concerns are expected. Precip may linger into Tuesday as models hint at a SW orientation of the flow aloft, enough to trigger at least low-end PoPs (30-40%) across our lowlands, but the wettest period does look to be Sunday night into Monday. Ridging then sets up late Tuesday onward, but ensemble clustering does depict more SW flow across the forecast area than previous runs had shown. Will have to see where exactly models shift the ridge axis over subsequent runs, as we could potentially see more prolonged precip chances should the ridge shift any more south than it already has. For now, still broadly forecasting a wet Sunday into Monday, with lingering precip Tuesday, before drier, warmer conditions prevail Wednesday into Thursday, with temps inching up into the upper 60s across the lowlands. Expect breezy conditions to occur as well as we transition from Sunday night`s trough into midweek ridging. Evans/74 && .AVIATION...12z TAFs...VFR conditions expected. Winds will generally be NW during the day at most sites at around 8-15 kts, with sct mid- level cigs, before clearing is expected to take place in the evening. Winds will become light and terrain-driven Thursday night as well. Evans/74 && .PRELIMINARY POINT TEMPS/POPS... PDT 56 33 61 34 / 10 10 0 0 ALW 55 35 60 36 / 20 0 0 0 PSC 62 32 64 33 / 0 0 0 0 YKM 60 33 62 35 / 0 0 0 0 HRI 60 32 64 33 / 0 0 0 0 ELN 57 32 61 34 / 10 0 0 0 RDM 52 26 60 28 / 10 0 0 0 LGD 49 28 56 29 / 20 0 0 0 GCD 48 26 57 30 / 20 10 0 0 DLS 61 36 66 38 / 0 10 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...97 LONG TERM....74 AVIATION...74

586 FXUS65 KREV 030900 AFDREV Area Forecast Discussion National Weather Service Reno NV 200 AM PDT Thu Apr 3 2025 .KEY MESSAGES... * Light snow showers possible this afternoon, mainly in the mountains. * Cold temperatures with hard freezes widespread through Friday morning. * Warming trend starting this weekend, with well above normal temperatures much of next week. A few showers possible Monday, primarily north of I-80. && .DISCUSSION... * A cold upper level trough will continue to slowly move east today. With cold air in place and remnant moisture, we`ll maintain a slight 15-20% chance for snow showers in the Sierra. Any accumulations will be light, generally 1" or less. Today`s temperatures will feel more like mid-February instead of early April. High temperatures will be in the low 50s in western NV and mid 30s to low 40s for the eastern Sierra communities. * By Friday into Sunday, a positively tilted ridge will move into the region. High temperatures for Friday will increase around 3-6 degrees across the area, with an additional warming in store for Saturday and Sunday. By Saturday, temperatures will rebound to around normal readings for April 5th, which is low to mid 60s in western NV and the low to mid 50s for the eastern Sierra communities. Further warming is expected for Sunday, with above average temperatures to end the weekend. * By late Sunday into Monday, models and their respective ensemble solutions show a weak trough swinging through northern CA into the northern Rockies. This will lead to a 20-40% for showers from the Tahoe Basin northward into Lassen County. Accumulations will be light, with a 20-40% chance for at least 0.10" of liquid. There is also a 35-50% chance for light showers in the Surprise Valley and far northern Washoe County, with a 20-40% chance for at least 0.10" of liquid. * Heading into next week, there is still good confidence in a more pronounced warmup with a long-wave ridge over much of the western US. By Wednesday, the NBM still has 50-80% chance for highs of at least 80 degrees for western Nevada cities, with decent odds of 70s on Sunday and also on Tuesday. -McKellar && .AVIATION... * A few isolated rain/snow showers with MVFR/IFR conditions are possible this afternoon across the eastern Sierra, generally 10% coverage or less. * Otherwise VFR-MVFR clouds across W Nevada including RNO with light winds. * With recent moisture and clearing skies, fog could be an issue Friday morning after 9z. Especially for KTRK (20%) -McKellar && .REV Watches/Warnings/Advisories... NV...None. CA...None. && $$

357 FXUS66 KSTO 030811 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 111 AM PDT Thu Apr 3 2025 .Discussion... .Synopsis... Warm and mild weather expected through weekend`s end with light north winds at times. Early next week will see a weak system bring light precipitation to Northern California, mainly over the mountains and adjacent foothills. .Key Messages... * Drier and warmer weather returns through the weekend. * Chances for Valley Highs > 75 Degrees Saturday/Sunday: 50-90% * A weak system will bring clouds and light precipitation mainly to areas in northern Sacramento Valley Sunday night and Monday. * 24-Hour Mountains/Foothills Precip. Amounts > 0.25" (Sunday- Monday): 30-60% * Mild and dry conditions after Monday into middle of the week. .Changes from previous forecast... * No changes from previous forecast. && .AVIATION... Mainly VFR conditions across interior NorCal next 24 hours. Winds from the north less than 12 knots. Slight chance (~20%) of BR development in the central/southern Sac Valley through 18z today, with visibilities reaching 1/2SM but confidence low on MVFR conditions developing. Scattered, light mountain showers through 02z Friday. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$

904 FXUS65 KMSO 030957 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 357 AM MDT Thu Apr 3 2025 .DISCUSSION... KEY MESSAGES: - A Canadian cold front will bring snow to northwest Montana, including the Flathead valley late into Thursday - Warmer and drier conditions Friday into the weekend - Cold front and active weather Monday through Wednesday The Canadian cold front is currently pushed up against the Continental Divide around Glacier National Park. Temperatures on the west side of the Divide around in the low to upper 30 degree temperature range while the readings on the east side are in the low to mid 20 degrees. This air mass is still expected to push across the Divide today causing an enhance in the snow production across northwest Montana. Several winter weather advisories are currently out for the potential impacts of snow on roadways this morning causing difficult driving conditions. Another area of concern is Lookout pass and Evaro hill this morning as some scattered showers are producing light snow in the higher elevations. These aforementioned passes could experience a period of snow covered roadways if a heavy enough shower passes through this morning. A ridge of high pressure begins to build over the Northern Rockies Friday into the weekend. Temperatures should be in the 60s for most valley locations by Saturday which is around 10 degrees above seasonal averages. Sunday should experience an addition 5 degrees warming compared to Saturday. A cold front is still on track to push through the Northern Rockies on Monday causing gusty westerly winds along with widespread precipitation. Snow levels will be dropping to across 5000 feet Monday night into Tuesday morning which could cause another round of snow accumulations on mountain passes. A cool and active weather pattern persists through Wednesday. All the models are indicating that a ridge rebuilding for the latter part of the work week bring another round of warm and dry conditions. && .AVIATION...Scattered snow showers will continue to impact northwest Montana during the early morning hours mainly affecting KGPI and KMSO. A Canadian cold front will push westward over the Continental Divide today causing an enhancement of snow over Northwest Montana. This cold front will continue to slide to the south and west during the afternoon and evening, potentially impacting KMSO and KBTM. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...Winter Weather Advisory until 3 PM MDT this afternoon for Flathead/Mission Valleys...Kootenai/Cabinet Region...West Glacier Region. ID...None. && $$

356 FXUS65 KBOI 030919 AFDBOI Area Forecast Discussion National Weather Service Boise ID 319 AM MDT Thu Apr 3 2025 .SHORT TERM...Today through Saturday night...Main upper trough is still over the interior western US this morning but gradually filling. After patchy morning valley fog, one last weak short wave trough, over southern BC at 2 AM MDT, will enter the main trough later today and produce scattered afternoon snow showers in the Idaho mountains. This trough will also provide enough cooling aloft for isolated thunderstorms this afternoon in mountains on the Idaho side. Then clearing and cold tonight under northerly flow aloft. A warming trend will begin Friday as the main trough shifts eastward to the Rocky Mountains and our area comes under the influence of a high amplitude upper ridge off the west coast. The ridge will come inland Saturday and Sunday bringing even warmer days along with mostly clear skies, although nights will stay relatively cold. Northwest winds today and Friday, generally 5 to 15 mph during the nights and mornings, then 10 to 20 mph with afternoon gusts to 30 mph in the central Snake Basin southward to the Nevada border. .LONG TERM...Sunday through Thursday...An amplified ridge will continue Sunday, supporting relatively warm temperatures and dry conditions for one more day. A shortwave trough will approach eastern Oregon and southwest Idaho late Sunday, consequently generating shower activity by Monday. Showers are more likely to occur across northeast Oregon and west-central Idaho (50-70% chance), with lower chances (25-40%) farther south near the NV border. As the precip and cold front move through the area Monday, snow levels will lower to 6000-7000 feet MSL. Snow amounts should remain relatively minor due to the quick progression of this trough, but surface winds could become breezy. A much weaker shortwave will follow on Tuesday with current model guidance keeping the moisture limited to the northern areas. Tuesday snow levels are expected to lower further to around 5000-6000 feet. Beyond Tuesday, dry, high pressure will rebound across the western U.S. and warm temperatures to approximately 10-15 degrees above normal by Thursday. && .AVIATION...Mainly VFR conditions. Scattered showers will create periods of MVFR/IFR conditions after 03/18z, mainly over the mountains. Stronger showers may produce lightning, graupel, and outflow winds of around 30 kt. Snow levels 3500-4500 ft MSL. Brief low stratus and patchy valley fog expected through 12z-16z over KMYL, KTWF, and KJER. Mountains obscured at times. Surface winds: W-NW 5-15 kt with gusts 20-25 kt. Winds aloft at 10kft: N-NW 10-20 kt. KBOI...Mainly VFR. Scattered showers expected this afternoon along Boise foothills, obscuring mountains at times. Surface winds: NW 5-15 kt with gusts around 20 kt by afternoon. Weekend Outlook...Lingering MVFR/IFR snow showers and low clouds over s-central Idaho Friday. Otherwise, generally VFR Friday through Sunday with building high pressure. Surface winds: NW to N 5-15 kt Friday, becoming SW-NW 5-15 kt Saturday/Sunday. && .HYDROLOGY...A Flood Warning continues for the Silvies River near Burns, OR, until further notice. The river itself has receded below flood stage but flooding continues nearby. Snowmelt has decreased due to colder weather the last few days but will increase again Sunday and Monday, possibly bringing the Silvies above flood stage again on Monday. Minor cooling is expected later Monday through Tuesday, but warmer weather is forecast for several days beginning Wednesday, and increased snowmelt will raise concern for more serious flooding on all rivers at that time. && .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...LC LONG TERM....JY AVIATION.....SH HYDROLOGY....LC

534 FXUS65 KLKN 030808 AFDLKN Area Forecast Discussion National Weather Service Elko NV 108 AM PDT Thu Apr 3 2025 .SYNOPSIS... A trough of low pressure near the Utah/Nevada border will be responsible for widely separated snow showers throughout Northern and Central Nevada today into tonight. A warming trend is expected Friday through at least next Thursday. By next Thursday afternoon, high temperatures will be around fifteen degrees above normal for this time of year. && .SHORT TERM...Today through Friday night A trough of low pressure will be located near the Utah/Nevada border today. An upper-level area of low pressure will develop in the base of this trough over the Desert Southwest tonight. This atmospheric disturbance will be responsible for widely separated snow showers across Northern and Central Nevada today into tonight. Snow amounts should be one inch or less over passes and summits along Highway 50 from Austin to Ely, as well as along Interstate 80 from Winnemucca to Elko today and tonight. Snow accumulations of one to two inches are anticipated along Highway 50 east of Ely and along Interstate 80 east of Elko today and tonight. Here are probabilities of a trace of snow or more for select locations in Northern and Central Nevada from 5 AM PDT Thursday, April 3rd, 2025 until 5 AM PDT Friday, April 4th, 2025: Lamoille - 70% Wells - 68% Austin - 58% Spring Creek - 57% Jackpot - 56% Owyhee - 53% Eureka - 49% Elko - 48% Ely - 44% Carlin - 37% The aforementioned cyclone aloft over the Desert Southwest will progress eastward Friday and Friday night. There may be enough lingering instablity and atmospheric moisture for a few snow showers near the Nevada/Utah border Friday afternoon. High temperatures throughout Northern and Central Nevada Friday afternoon will be six to eight degrees below normal for this time of year. .LONG TERM...Saturday through next Thursday Look for dry and warmer weather conditions throughout the weekend and much of the week as upper level ridging builds across the southwest. Upper level trough expected to move across northwestern U.S. with a slight chance of bringing some moisture over northern Nevada along the state border with Idaho, however precipitation at this time expected to be very light. Shortly after, upper ridging build back up. Temperatures will see gradual warming each day with highs in the 50s to 60s Saturday, warming into the 60s with some 70s in central Nevada Monday through Tuesday, with Wednesday seeing 70s with a few 80s in central Nevada. Overnight lows see a gradual warming trend as well, but start later with lows over the weekend in the 20s, then in the 30s to 40s starting Monday. The increase in temperatures will enhance snowmelt over the mountains which may lead to some rivers reaching flood levels. Southerly winds over the weekend expected to stay towards central Nevada at 10-15, then become light. Rest of the week, elevated westerly winds expected from the near zonal flow by the upper trough, increasing winds to 10-20 mph each afternoon Monday through Wednesday. && .AVIATION... VFR conditions dominant at all terminals over the next 24 hour period, however MVFR or lower conditions possible due to some lingering showers. Chances for isolated rain/snow showers remain today with chances for -SHSN over KEKO, KELY, and KBAM. Winds expected to be light until the afternoon with some breezy northerly winds across the central terminals around 10 kts, gusts 20 kts. && .LKN Watches/Warnings/Advisories... None. && $$ 87/90/97