372 FXUS66 KSEW 310311 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 811 PM PDT Sun Mar 30 2025 .SYNOPSIS...A weak disturbance will bring scattered showers and cooler conditions throughout the middle of the week. Ridging looks to develop later on in the week and into the weekend for drier and warmer conditions across the area. && .SHORT TERM /TODAY THROUGH WEDNESDAY/...Latest satellite and radar shows the system moving into western Washington this evening, with the low pressure center well offshore to the west. Showers have had to overcome a relatively dry layer with the dry easterly winds, but rain has begun to reach the ground around Seattle and southward. These showers generally will be scattered in nature and lacking in QPF heading into Monday. On and off shower activity will continue into Monday with low pressure spinning offshore. Additionally, breezy east to southeast winds will decrease a bit tonight, becoming more due-southerly tomorrow but still some gusts up to 25 to 30 mph may be possible. The upper low will move southward into Oregon on Tuesday and into Wednesday, bringing most of the shower activity with it. Drier conditions can be expected throughout the middle of the week, with a stray shower or two possible. Afternoon highs in the mid 50s. .LONG TERM /THURSDAY THROUGH SUNDAY/...Ensembles are starting to converge in a pattern change, from broad troughing on Thursday to a upper level ridge building on Friday and throughout the weekend. Clusters are also highlighting a high amplitude ridge building over the Pacific Northwest - which would bring drier and warmer conditions throughout the weekend. There is still some uncertainty of the strength and size of this ridge, but it is becoming increasingly likely that we will see warmer temperatures and some nice spring time weather next weekend! Mazurkiewicz/62 && .AVIATION...Southerly flow will continue aloft throughout the period as an upper level low approaches the region. At the surface, most terminals have seen the shift to more south to southeasterly winds ranging 10-15 kts with gusts up to 25 kts. PAE seems to be the only straggler, still seeing easterly winds but should see winds here shift to join the majority by 06Z tonight. These speeds and gusts will remain in place for much of tonight before easing slightly to 5- 10 kts by 12Z Monday morning. Southerlies will ramp up again slightly Monday afternoon with speeds generally 8-12 kts. Even with the front starting to lift into W WA this evening and the associated rainfall with it, cigs remain VFR for most locations at the time of this writing. Some of that due largely to the persistent easterlies over the region for much of the day, allowing lower levels of the atmosphere to dry out. Cigs will lower with precip, but by and large all terminals expected to remain VFR...although occasional dips into high-end MVFR cannot be ruled out for terminals more prone to lower cigs. However, confidence for this occurring is not high enough to warrant TAF inclusion. KSEA...VFR conditions expected to persist through much of the TAF period. Precip taking its time getting to the terminal, largely delayed by aforementioned dry easterly flow throughout the daytime hours. Best chance for showers to start will be in the 03-06Z time frame, however radar trends show some difficulty in any persistent rain threat for the terminal. VCSH probably the best way to play this threat now, with on the fly amendments needed should precip become more convincing. Above surface wind discussion applies with SeaTac seeing speeds close to the middle of the ranges provided. 18 && .MARINE...A frontal system associated with an offshore low will lift across the area waters tonight into Monday, allowing for winds to transition back to southerly. This system will bring another round of small craft advisory strength winds to the coastal waters and to the interior waters of Admiralty Inlet, the Eastern Strait, and the Northern Inland Waters. As such, inherited headlines will remain in place. Winds will then ease into Monday afternoon. The surface low then looks to push inland over Oregon on Tuesday. Increasing onshore flow through the Strait Tuesday evening into Wednesday may yield another round of headlines. Otherwise, additional weak systems may drop down into the area waters from the north around midweek, but do not look to have as much of an impact at this time. High pressure then looks to build into the area waters Thursday and Friday. Seas increasing to 7 to 9 ft by Monday. They may briefly approach 10 ft by late Monday night before subsiding and hovering around 6-8 ft through midweek. Additional easing is expected after that, reaching 3-5 ft Thursday as high pressure builds. 14/18 && .HYDROLOGY...The Skokomish River will remain in action stage into midweek, but overall QPF through the week ahead does not look sufficient to produce any flood concerns there or along any other rivers across the region through the upcoming week. 27 && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 11 AM PDT Monday for Admiralty Inlet- East Entrance U.S. Waters Strait Of Juan De Fuca-Northern Inland Waters Including The San Juan Islands. Small Craft Advisory until 2 PM PDT Monday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. && $$

822 FXUS66 KPQR 310501 AFDPQR Area Forecast Discussion National Weather Service Portland OR 1001 PM PDT Sun Mar 30 2025 .SYNOPSIS... Ridging builds into the area bringing a brief break in precipitation as well as a slight warming trend today. This will be short lived as a broad area of low pressure will bring cool and wet conditions back to the region through the latter part of the upcoming week. Another shortwave ridge looks to develop Wednesday evening/Thursday which will bring warm and dry conditions once again. && .DISCUSSION...Today through Saturday...A pattern change is currently occurring as troughing begins to build back into the region, and rain is currently pushing into the region from the south. This marks the beginning of a few cool and showery days as an offshore low spins a few rounds of moisture between now and Thursday. The initial wave of moisture is currently pushing into the area, though QPF looks fairly low and rainfall will likely be non- impactful. Between 5pm Sun to 5pm Monday, only around a 40-50% chance of lowland rainfall in the Willamette Valley and SW Washington lowlands to exceed 0.25 inches. At the coast and Coast Range, slightly higher accumulations closer to 0.5-1.0 inches is expected during this period. Snow levels are currently around 5000 feet, but will be falling to around 2500-3000 ft by the end of Sunday night. As such, Cascades snow accumulation can be expected with this initial wave of moisture. That said, accumulations are expected to remain below advisory level, though snow accumulations will continue in the mountains throughout the week. Initial snow between now and 5pm Monday looks to be only around 3-4 inches at the central Oregon Cascades passes, even less at the northern Oregon Cascades. Easterly gusts through the Columbia Gorge are currently around 30-35 kts, including the Portland metro area. These will continue to decrease through this evening and tonight, shifting southerly with gusts up to 10 kts by around midnight tonight. Afterwards winds remain onshore and fairly weak through Thursday. Additionally, some weak instability is expected at the coast beginning this evening, enhanced in part due to orographic lift. This will produce a 10-15% chance of some weak isolated thunderstorms tonight at the coast. Monday sees showers continuing, with thunderstorms at the coast remaining possible (10-15% chance) through evening hours. Heading into Monday night, the main low passes south of the area (near the OR/CA border). Tuesday and Wednesday see generally unsettled conditions remaining, with weak showers at times. Accumulations will be generally negligible. Daytime high temperatures generally around the mid 50s for most inland locations, closer to the low 50s at the coast. Thursday through Saturday look to be very similar to each other as a shortwave ridge builds across the region. Daytime highs will starting the 50s on Thursday and warming around 5-7 degrees each day with daytime highs in the upper 60s to low 70s expected by Saturday. /JLiu/42 && .AVIATION...Light rain continues as a frontal boundary lifts northward across the region. Flying conditions remain largely VFR at area terminals, with MVFR cigs/vis along the coast and within heavier rain showers. Radar trends suggest continued decreasing coverage of shower activity from south to north behind the front, although this should have little impact as cigs remain at 2-4 kft given abundant surface moisture. Following a brief break, renewed shower activity should arrive from the south after 09-12Z Mon, continuing through the remainder of the period with increased likelihood of MVFR cigs/vis across the region. Winds have turned out of the southeast to south at inland terminals, and south to southwest along the coast. Speeds of 8-15 kt this evening will diminish to 10 kt or less, although gusts to 20 kt are possible at AST/ONP. Renewed rain showers after 09-12Z Mon may bring additional gusts of 15-20 kt inland. PDX AND APPROACHES...Mixed low-VFR/MVFR cigs with largely unrestricted vis are expected through tonight, although periods of MVFR vis within heavier rain showers cannot be ruled out, most likely after 12Z Mon when additional rain showers arrive from the south. South to southeast winds at 8-12 kt are expected through Monday morning, with gusts to 20 kt diminishing later this evening. By Monday afternoon, winds will begin to turn out of the south to southwest. -Picard && .MARINE...A frontal system exiting the coastal waters this evening has yielded winds turning southerly to southwesterly. Buoy observations have shown gusts of only 25-30 kt, and have therefore cancelled the Gale Warning early, however Small Craft Advisories remain in effect through Monday evening as another low pressure system approaches the waters. The Small Craft Advisory may need to be drawn out further for at least the inner and outer waters south of Cape Falcon where higher seas and winds may persist. Seas around 10 ft tonight will begin to diminish following modestly weakening winds before a fresh southwesterly swell arrives, building seas up into the 10-14 ft range. Seas then decrease late Tuesday into Wednesday, leveling out around 5 to 7 ft at 9 seconds by Wednesday afternoon, remaining there for the middle to end of the week as north to northwesterly flow resides aloft, keeping winds fairly low, and the prevailing swell low as well. -Schuldt/Picard && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...Small Craft Advisory until 11 PM PDT Monday for PZZ210-251>253- 271>273. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

704 FXUS66 KMFR 310543 AFDMFR Area Forecast Discussion National Weather Service Medford OR 1043 PM PDT Sun Mar 30 2025 Updated AVIATION discussion .DISCUSSION.../Issued 220 PM PDT Sun Mar 30 2025/ A compact surface low is evident on satellite imagery this afternoon, located directly west of Brookings as of the time of this writing. This low is tracking just as the high- resolution models depicted earlier today, and is on track to pass just offshore of southern Oregon and move onshore around Cape Blanco or perhaps a bit to the north. This low is responsible for significant wind concerns today, and we have been watching coastal and marine wind gusts spread north from Cape Mendocino throughout the day so far. Winds at the marine buoys and points along the coast have seen dramatic increases in very short periods of time. Meanwhile, inland winds have responded to a strong MSLP gradient, and enhanced with momentum transfer due to showers and mountain wave effects, mid level winds have translated to the surface as gusts. It has been a challenge to nail down the details of where winds will occur, as changes in the low track by just a few miles can and have been making significant effects on various areas. For instance, the low tracking just slightly closer to the coast has enhanced the inland winds, while simultaneously reducing the expected winds along the coast north of Cape Blanco. The strongest winds should weaken once the low passes, while overall, winds will taper off through the evening. Numerous wind headlines remain in effect for much of the area, and details on these can be found at PDXNPWMFR. A High Wind Warning for coastal areas and Wind Advisories for inland areas are in place into this evening to highlight possible hazardous conditions. Additionally, this front will bring slight thunderstorm chances (10-15%) along the Oregon coast this evening and tonight with lesser chances for inland areas west of the Cascades. And of course, any thunderstorms are likely to produce additional periods of locally gusty winds. Impactful conditions turn from wind to winter on Monday and Tuesday. With the front off to the north, a low pressure system will draw closer to then move over the area. A cold air mass moving with this system will bring cooler temperatures and lower snow levels across the area. Southwesterly flow aloft will continue to bring precipitation across the area. Snow levels are forecast to drop to 2500-3500 feet through Monday and Tuesday, with hazardous winter weather possible in certain areas. A Winter Storm Watch has been upgraded to a Winter Storm Warning for areas in Siskiyou County above 4500 feet, and will be in place from early Monday morning through Tuesday evening. Peaks and ridgelines in Siskiyou County could get 1 to 3 feet of snow through this timeframe. Sawyers Bar Road west of Etna could see over 2 feet of snow in places. A Winter Weather Advisory covers the Cascades and Mount Ashland in the same timeframe, with 12 to 24 inches of snowfall possible in these areas. A shorter Winter Weather Advisory is in place for areas along I-5 south of Weed and Highway 89 from Tuesday morning through Tuesday evening. Snow levels are forecast to reach their lowest in this period, possibly bringing impactful snowfall to these highways and cities in this area. Additionally, snow amounts to the east of the Cascades will just reach advisory criteria, although spread out over Monday and Tuesday. Another Winter Weather Advisory has been issued there, with mention of more gusty winds that could result from the expected showers. For other areas, generally light to moderate precipitation continues on Monday and Tuesday. Increased thunderstorm chances (15-25%) are forecast for areas west of the west of the Cascades on Monday afternoon. Curry and Josephine counties may see a period of increased precipitation on Tuesday morning. Gusty southwest winds are forecast to continue over elevated terrain, but that change of direction will prevent further funneling into the Shasta and Rogue valleys. Active but less impactful weather continues on Wednesday, as an upper trough moves over the area. Northwest flow along the back edge of the trough could bring continuing showers and cool temperatures on Wednesday and Thursday. As the upper pattern continues to move eastward, a high pressure system could settle over the area while low pressure remains over the southwest United States. This rex block pattern (high pressure poleward/north of a low pressure system) could bring a period of warmer temperatures and drier conditions. Meteogram guidance supports this, with both ECMWF and GFS outcomes showing an absence of precipitation for the first weekend of April and only weak signals for the week beyond. -BPN/TAD && .AVIATION...31/06Z TAFs...Winds have calmed down in the valleys through the evening and that is anticipated to continue tonight. There will be plenty of rain showers through tonight as cold moist air surges into the forecast area. Showers, and perhaps a stray thunderstorm, will remain a persistent feature into the overnight hours west of the Cascades. VFR ceilings remain most likely through the TAF period with pockets of MVFR ceilings developing under pockets of heavier showers or perhaps weak thunderstorms on Monday. Snow is anticipated east of the Cascades Monday evening as temperatures cool off into the evening hours. Accumulation should be no more than 2 inches within KLMT. -Smith && .MARINE...Updated 1000 PM Sunday, March 30, 2025... Seas still remain high and steep as of this Sunday evening and they will likely push higher into Monday. Seas will be hazardous to smaller crafts and perhaps some larger crafts as wave heights begin to push higher towards 16 feet at 11 or 10 seconds around Monday evening. Expect showers to continue, along with a slight chance of thunderstorms. A tapering to steep seas follows late Tuesday morning through Tuesday evening. Gradual improvement is expected to continue Tuesday night into the end of the week with light to moderate northerly winds. -Spilde/Smith && .MFR WATCHES/WARNINGS/ADVISORIES... OR...Winter Weather Advisory from 11 PM Monday to 5 PM PDT Tuesday for ORZ027>031. CA...Winter Storm Warning until 5 PM PDT Tuesday for CAZ080-082-083. Winter Weather Advisory from 11 PM Monday to 5 PM PDT Tuesday for CAZ082-085. PACIFIC COASTAL WATERS...Hazardous Seas Warning until 8 AM PDT Tuesday for PZZ350-356-370-376. && $$

150 FXUS66 KEKA 302249 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 349 PM PDT Sun Mar 30 2025 .SYNOPSIS...Scattered to widpread showers this evening through Tuesday afternoon. Heavy mountain snow for elevations above 3000 feet. Isolated thunderstorms, small hail and moderate-to-heavy downpours possible Monday through Tuesday. Lingering showers through Wednesday, followed by dry weather for the remainder of the week. && .DISCUSSION...A surface low brought strong south-southeast along the coast and and exposed ridges today. Surface observations reported 45 to 60 mph in Del Norte and Humboldt counties as the low moves northeastward near the North Coast. A warm air advection along the low- level jet promote high temperatures in the upper 50`s to mid 60`s. Showers activity will gradually increase as downsloping wind weakens this afternoon. A cold front will push onshore late this afternoon while the main upper level trough located over the NEPAC slowly digging southward along the coast. Expect periods of moderate to locally heavy showers and isolated thunderstorms possible this evening. The aforementioned trough will bring periods of widespread showers across the area through Tuesday. Rain will be focused in the northern half of the area Monday and Tuesday. Over 48 hours, 2 to 4 inches is most likely in Humboldt County and northern Mendocino, with up to 5.5 inches in Del Norte and generally less than 1.5 inches further south. Lesser amounts up to 0.75 inch are expected for southern Lake County. A colder deep-layer airmass will subsequently spread south across the West Coast tonight and persisting through Tuesday. The cold airmass will aid in steep lapse rates and increasing instability environment. Isolated thunderstorms, small hail and brief heavy downpours will be possible with the strongest showers. In addition, gusty southwest winds from 25 to 40 mph are expected across the area late Monday afternoon through Tuesday afternoon. Mountain snow impact will likely over Trinity County and northern interior Humboldt Monday through Tuesday afternoon. Snow levels will likely drop to 3000 feet on Monday. Heavy snow, with storm total accumulations at 7 to 12 inches for elevations above 3000 feet, with locally up to 1.5 feet across the higher ridges, will be probable from Monday morning through Tuesday afternoon. Snow levels will be generally above 3000 feet. However, uncertainty exist with snow levels due to it could be lower during convective showers. 2 to 3 inches of snow are expected for elevations as low as 2600 feet. Travel impacts are expected across much of highway 3 north of Weaverville and Hayfork Summit, Hwy junction 36 and 3 at South Fork Mountain, Hwy 299 at Berry Summit, Buckhorn Summit and Oregon Mountain. Lingering showers are expected through Wednesday, followed by dry weather for the remainder of the week as a large scale upper level ridge gradualy builds across the region in the wake of the trough. && .AVIATION...Active day of winds today with a potent shortwave trough wave passing by. Ample mountain wave activity continues to be observed through much of Southern Humboldt and Mendocino counties, and low level turbulence will remain a threat. .Surface winds will ease some going in to this evening, but farther north in to CEC, wind gusts of 30 kts from the south can be expected to continue through Monday. Low level wind shear has been reported at ACV. Winds aloft to 2000 ft AGL will still occasionally see 30 to 35 kts winds going into Monday morning, and some threat for low level winds shear will remain. The shower activity will also continue, evolving into a greater thunderstorm threat this late afternoon and evening. MVFR to VFR conditions will carry on outside of the heavier shower and anticipated thunderstorm activity where IFR CIGS and VIS will exist. The probability for thunderstorms increases for the coastal terminals after 0Z to 20-30%. The chances further increase into Monday morning to 30% (up to 40% locally for coastal Del Norte per HREF). These storms are expected to contain small hail. /JJW && .MARINE...A potent shortwave trough passed through the waters today, and gusts of 45 to up to 50 kts were recorded on some of the coastal buoys. Some lingering hazardous seas will be likely this evening in the wake of the strong gale. A separate and larger trough of low pressure will then begin working its way SE towards the North Coast. This will keep with southerly winds up through Tuesday morning when the low pushes ashore, likely into southern OR. Near gale to gale strength gusts will persist as a result, and a separate Gale Warning may be required for Monday night into Tuesday, particularly in the northern out zone. This trough will generate broad and strong fetch of westerly winds as it nears. Large, very steep and likely hazardous seas up to 18 ft are forecast to be sent our way form this fetch Monday evening through Tuesday. A Hazardous Seas Watch may be forthcoming as the gales expire. /JJW && .EKA WATCHES/WARNINGS/ADVISORIES... CA... Wind Advisory until 4 PM PDT this afternoon for CAZ101-102. Winter Weather Advisory from 5 PM Monday to 5 PM PDT Tuesday for CAZ105. Winter Storm Warning from 11 PM this evening to 5 PM PDT Tuesday for CAZ107-108. NORTHWEST CALIFORNIA COASTAL WATERS... Gale Warning until 7 PM PDT this evening for PZZ450-470. Small Craft Advisory until 11 PM PDT Monday for PZZ455-475. && $$ 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

113 FXUS66 KMTR 310324 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 824 PM PDT Sun Mar 30 2025 ...New UPDATE... .SYNOPSIS... Issued at 158 PM PDT Sun Mar 30 2025 Off and on rain chances through Tuesday with Wednesday kicking off a warming and drying trend through the weekend. && .UPDATE... Issued at 824 PM PDT Sun Mar 30 2025 Showers are approaching northwestern Sonoma county, the showers are associated with a cool front that`ll move across the forecast area late tonight and Monday. Light to moderate showers will increase in coverage overnight and Monday. Showers will continue Monday night and Tuesday. && .SHORT TERM... (This evening through Monday) Issued at 158 PM PDT Sun Mar 30 2025 Zonal flow resides over the Bay Area and Central Coast tonight while an upper level trough advances towards the PacNW before pushing into the PacNW on Monday. The associated low will bring beneficial rain to the our neck of the woods through Tuesday along with some gustier bouts of wind. In addition to rain and wind, there is a small chance for thunderstorms on Monday, primarily for the North Bay, San Francisco and East Bay areas. Though there is some CAPE, generally around 100-200 J/kg, modest shear (unidirectional per NAM and GFS soundings, and moisture there are other factors that might hinder such as positive LIs, poor total totals, and midlevel lapse rates being mid. Figure given the morning model data a few rumbles of thunder be able to occur but not widespread. The same can be said for Tuesday, though the SPC has general thunder dipping towards the South Bay as the low tracks over east towards the interior. && .LONG TERM... (Monday night through next Saturday) Issued at 158 PM PDT Sun Mar 30 2025 Upper level low holds over much of the West on Wednesday and Thursday while upper level ridging builds over the Pacific. Dryer weather is on tap for us during this period, with temperatures gradually warming. As the upper level ridge moves inland towards the weekend temperatures will continue to warm. Valley and interior locations look to make to the 70s by the weekend, while the 60s to near 70 are realized elsewhere. && .AVIATION... (00Z TAFS) Issued at 531 PM PDT Sun Mar 30 2025 MVFR CIGs begin to lift into the evening passing mid-level clouds persist. Breezy southerly winds reduce into the night as well. Expect additional waves of showers overnight, starting in the North Bay and becoming widespread into the early morning. MVFR CIGS and reductions in visibility follow these rain chances, but will not be widespread. Shower chances pause in the mid morning, but another round of light rain moves through in the late morning and afternoon along with breezier southwest to west winds. Vicinity of SFO...Scattered low clouds and broken mid-level clouds continue to move through the area. Winds reduced into the evening but remain moderate through the night. Showers move through the are in the late night and last into the mid morning, offering slight reductions in visibilities. These showers exit in the mid morning. Breezy to gusty westerly winds arrive into Monday afternoon with another batch of showers. Winds weaken and shower chances exit into the early night. However, additional rains arrive shortly beyond the TAF period. SFO Bridge Approach...Similar to SFO Monterey Bay Terminals...VFR lasts into the late night. Shower activity arrives with MVFR CIGs in the late night. CIGs remain in the early morning, but rain chances reduce. Additional showers arrive in the mid to late morning while CIGs lift back to VFR levels. && .MARINE... (Tonight through next Saturday) Issued at 531 PM PDT Sun Mar 30 2025 Winds are reducing but will stay breezy enough to remain hazardous for smaller craft in the outer waters into the night. Expect occasional showers through the day. Winds will shift back to westerly by Tuesday. Moderate seas will prevail through Monday before the combined seas from a southerly swell and NW wind wave become very rough Tuesday morning. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory from 9 AM Monday to 3 AM PDT Tuesday for Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory until 9 AM PDT Tuesday for Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory from 9 PM Monday to 9 AM PDT Tuesday for Pigeon Pt to Pt Pinos 10-60 NM. && $$ SHORT TERM...KR LONG TERM....KR AVIATION...Murdock MARINE...Murdock 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

992 FXUS66 KOTX 310457 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 957 PM PDT Sun Mar 30 2025 .SYNOPSIS... Showers will spread into the region tonight into Monday. Isolated thunderstorms are possible Monday afternoon. Cool and unsettled weather pattern will persist through much of the week with a warming and drying trend by the weekend. && .DISCUSSION... Tonight - Tuesday: A broad area of low pressure spinning off the coast will wobble inland delivering several rounds of showers and continued cool conditions. As of 2PM, the center of the low was between 130-140W off the Coast of Oregon; several embedded waves extending from the mother low are evident on water vapor with the first beginning to lift through Oregon. This will deliver the first round of showers to the Inland NW late this evening and overnight. Clouds will trap the afternoon warmth keeping snow levels between 4500-5500 feet. Consequently, light snow will be possible on the mountain passes and anywhere from 0.02-0.15" rainfall in the lowlands. As the low drifts inland Monday, 500mb temps will cool around 4-5C, steepening lapse rates, and increasing the threat for additional showers with any breaks in the clouds in the morning. More organized bands of showers will develop along another embedded wave swinging inland ahead of the main low. There are subtle differences in the models in timing of this feature but little argument of its existence. Isolated thunderstorms will be possible across the region on Monday afternoon. Highest probabilities via the HREF/SREF calibrated thunder are focused over southeastern WA and the lower Idaho Panhandle and portions of the north-central Cascades. The European Ensemble highlights Central WA and the SW Basin. The depth of the clouds and lightning potential will be extremely dependent on where we see the best breaks in the clouds and few hours of sunshine. Due to weak shear, the main threats from any cells will be lightning and brief downpours of rain, small hail, and graupel. The second, aforementioned wave Monday PM will stall over southern WA, weaken, then begin to drift southward as the mother offshore low swings into southern Oregon and begins to pull the wave back south. Models are struggling with the details of the precipitation placement with this wrap around band of moisture as it loses its northward progression and starts to weaken. The slow nature of these features does bring low probabilities for a 0.10" - 0.25" of liquid under them. If this setups up on the mountain pass, 2-3 inches of snow is possible overnight. In the lowlands, it will largely fall as rain initially but snow levels will be falling as low as 2000 feet overnight with potential for slushy accumulations. Additional breaks in the clouds Tuesday afternoon will result in widely scattered hit or miss showers. This will be unorganized convection with the highest PoPs over the mountains and slight chance in the E Basin. A slight uptick in west to northwest winds will limit shower chances in the lee of the Cascades but would not rule it out completely given 500mb temps of -27C still present aloft. It will become breezy Tuesday afternoon with wind speeds of 5-15 mph and gusts up to 25 mph. The most persistent winds will come through the Cascade gaps and into the Western Columbia Basin. Temperatures over the period will be on par with late March averages with highs in the 50s and lows in the 30s. /sb Wednesday through Sunday: As we move into the second half of the week, ensembles are coming into better consensus that we will see warmer temperatures and dried conditions to end the first week of April. Wednesday we will see a shortwave pass over the region, with some showers mainly over the mountainous terrain, with similar conditions expected Thursday as well. Precipitation totals will be light with any shower. With some available CAPE in the atmosphere, a slight chance of thunderstorms was added to the forecast for Wednesday afternoon in the northern WA mountains and ID Panhandle. Late Thursday is when the ridge starts to slide into the region and will continue to strengthen through the weekend. High temperatures this time of year range from the low to upper 50s which is what the region will see Wednesday. Temperatures begin to warm starting Thursday, warming roughly 5 degrees each day through at least Sunday. By Sunday, upper 60s to low 70s will blanket the region. /KK && .AVIATION... 06Z TAFS: A band of light rain showers will move south to north through the forecast area reaching the Canadian border around 11z. More chances for showers come with a second band forming in SE WA around 11z and move north towards Pullman and Spokane and bring MVFR and perhaps IFR cigs in the late morning tomorrow. There is a 40-80% chance of MVFR cigs for KPUW-KGEG-KSFF-KCOE from 12z to 0z. Timing of these bands will be challenging. The atmosphere also becomes increasingly unstable on Monday with cooling aloft. Look for showers to deepen in depth with potential for isold lightning strikes. The degree of breaks in the clouds will play a large role in whether any site receives lightning or not. Brief downpours and local MVFR conditions possible under heavier cells. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: Moderate uncertainty after 12z for CIGS in eastern WA and north ID. ----------------------- 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 41 52 34 52 35 51 / 70 50 20 20 10 30 Coeur d`Alene 40 51 34 50 34 49 / 80 60 40 40 20 60 Pullman 41 50 33 49 35 47 / 80 70 30 30 20 50 Lewiston 45 56 37 55 39 55 / 50 70 30 20 20 30 Colville 38 51 33 52 32 52 / 70 80 30 30 10 50 Sandpoint 38 49 35 48 35 47 / 70 90 50 60 30 80 Kellogg 39 48 33 46 37 44 / 80 80 50 60 30 80 Moses Lake 42 57 36 58 35 58 / 60 20 10 10 0 0 Wenatchee 41 54 35 57 37 55 / 80 30 10 10 0 10 Omak 42 56 35 57 34 57 / 70 70 30 10 0 10 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. && $$

844 FXUS66 KPDT 310531 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 1031 PM PDT Sun Mar 30 2025 Updated Aviation Discussion .AVIATION...06Z TAFs...VFR conditions to prevail through the period. Only exception will be a low potential (<30%) for MVFR or lower conditions in moderate rain showers that impact sites throughout the period. Rain showers continue to impact sites across the area this evening, with impacts expected to continue overnight at sites PDT/ALW/RDM/BDN/PSC, and return to site DLS after 15Z. Another round of showers will be possible after 18Z at sites DLS/PDT/ALW with vicinity showers at site PSC. All other sites are expected to remain dry through the period. Winds will mostly be light, less than 12kts, through the tomorrow morning. However, passing showers this evening may produce breezy conditions to 12-17kts with gusts to around 30kts possible through 8Z. Winds will increase to 12-17kts with gusts to around 25kts around and after 18Z at all sites. Lawhorn/82 && .PREV DISCUSSION... /issued 640 PM PDT Sun Mar 30 2025/ .EVENING UPDATE...Updated the forecast to better match the current situation. Radar shows a few cells moving across Deschutes and Crook Counties with some embedded thunderstorms that have produced a few strokes of lightning. As the system continues to push northeastward, these cells may continue to produce some isolated thunder and lightning. Otherwise, rain is expected to steadily make its way slowly across the region. 90 PREV DISCUSSION... /issued 503 PM PDT Sun Mar 30 2025/ .SHORT TERM...Tonight through Tuesday...Precipitation is expected to increase tonight in advance of an area of low pressure off the coast. The precipitation chances will continue through the day Monday before decreasing Monday afternoon/evening with most areas becoming dry. The low off the coast will then come onshore in southwestern Oregon late Monday night or early Tuesday morning and bring another round of precipitation Tuesday afternoon, especially for the mountains. QPF tonight will generally be 0.50 to 1.0 inches along the highest portions of the Oregon Cascades and much less less elsewhere. Along the crest of the Blues and the rest of the higher terrain, perhaps around 0.25 inches and in the lower elevations, generally less than 0.10 inches, though some could get between 0.10 and 0.20 inches. Snow levels will initially start out quite high...over 5000 feet, but will fall to between 2500 and 3000 feet by Monday morning. Snow amounts tonight should be no more than a couple of inches at along the crests of the Cascades and less elsewhere. QPF Monday into Tuesday (mainly beginning later Monday) will be between 0.50 and 1 inch is possible along the crest of the Oregon Cascades, around 0.50 inches along the crest of the Blue Mountains. Most lower elevation locations will get less than 0.10 inches. Snow levels will rise from 2500 feet to 3500 feet by Tuesday afternoon. Snow amounts Monday into Tuesday will be higher along the Oregon Cascades and Blue Mountains with several inches possible along the crests. Will have to monitor for any needed headlines at a later time but confidence is low due to time of year, warm ground and will have to see the potential for snow accumulation at night. There will be some diurnal breezes on Tuesday in the 20 to 25 mph range. NBM probabilities of wind gusts >=25 mph are 70 to 90 percent. NBM probabilities of wind gusts >= 39 mph are generally less than 50 percent. .LONG TERM...Tuesday Night through Sunday... Key Messages: 1) Light mountain snow and low elevation rain. 2) Late week ridging with drier and warmer conditions. Models are in great alliance that the ridge will be settling just off the coast with the trough axis over the Rocky`s across Idaho, Utah, and Nevada. Wrap around from the surface low pressure will keep precip lingering for the next couple of days. QPF amounts are not impressive looking at either snow or rain thanks to the northward surface wind preventing an abundance of moisture entering the region. NBM is displaying up to an additional three inches of mountain snow through the long term period (50-70% confidence), with a trace to up to a half inch in Central OR (60-80% confidence). QPFs for the Basin and other parts of low elevations don`t leave a lot to discuss as they remain tapered up to 0.05 inches. Ridging begins to take place of the shortwave, introducing a dry, warmer pattern for the PacNW. Clusters are in good agreement that most precip will move out of the region by Thursday night, but 39% would like to extend the precip until Friday morning. This will hardly make a difference in the total QPF amounts we will receive through Friday and will solely be a disagreement in the timing when things dry out. Models for the remainder of the term have timing disagreements when the ridge axis will take place over the region, but the overall picture of a dry/warm weekend remain intact overall. Temperatures will begin a warmer trend as we head into the weekend thanks to the overhead ridging, with most areas receiving high temperatures 5 to 15 degrees above normal. The high temperatures for this weekend will climb into the following ranges: Friday: Mid to High 50s Foothills of the Blues and Central OR; Low to Mid 60s Upper Columbia Basin; Mid to High 40s in Higher Elevations. Saturday: Low to Mid 60s Foothills of the Blues and Central OR; Mid to High 60s Upper Columbia Basin; Low to Mid 50s in Higher Elevations. && .PRELIMINARY POINT TEMPS/POPS... PDT 40 55 35 56 / 90 50 20 20 ALW 42 55 37 55 / 70 60 30 30 PSC 41 60 35 61 / 50 40 10 10 YKM 37 58 33 59 / 90 20 10 10 HRI 40 60 34 60 / 90 50 10 20 ELN 36 54 35 56 / 90 40 10 10 RDM 32 50 29 51 / 60 40 20 30 LGD 37 49 29 49 / 90 90 40 40 GCD 35 49 28 48 / 90 80 40 60 DLS 40 57 36 59 / 100 40 10 20 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...77 LONG TERM....95 AVIATION...82

927 FXUS65 KREV 302132 AFDREV Area Forecast Discussion National Weather Service Reno NV 232 PM PDT Sun Mar 30 2025 .KEY MESSAGES... * Periods of moderate to heavy mountain snow will result in difficult travel in the Sierra through Tuesday. * Gusty winds continue through the early evening with another afternoon of increased winds on Monday. * Daily chances of showers expected during the latter half of the week with a drier pattern favored next weekend and beyond. && .DISCUSSION... Today begins our multi-day period of stormy, windy weather that will result in travel and recreation impacts across the region. 17Z radar and satellite data reveal that the warm side of our ongoing storm has arrived, leading to gloomy and showery conditions this morning. Snow levels have risen to near 7000 feet in response to the arrival of the warmer air, confining snow to the higher Sierra terrain with rain elsewhere. Spotty rain and high elevation snow showers will continue through much of the day before shower intensity/coverage increases overnight along and ahead of a cold front. Snow levels also fall below 6000 feet Monday morning for NE California and the Tahoe Basin, then in Mono County Monday afternoon. Rain will switch to snow for lower elevation Sierra communities during these respective periods, likely making for a messy Monday AM and PM commute. Heaviest snowfall rates of 1-2"/hr on Monday are expected from mid to late morning with another burst of heavier snow in the late afternoon. Shower activity tapers off Monday night, leaving 1-3 feet of snow along the Sierra crest and 5-12" at lower Sierra communities (e.g., Truckee, South Lake, Mammoth Lakes) when all is said and done. Periods of spillover showers into western Nevada begin Monday morning and continue through the afternoon. Falling snow levels approach valley floors Monday morning, allowing for snow across foothills/Virginia City, where up to a couple inches are possible. A few snowflakes may be able to reach valley floors, but snowfall rates won`t be nearly sufficient to overcome a higher sun angle. Yet, roads will likely be wet and slick during the Monday commutes. In true spring fashion, there is also a 10-20% chance of thunderstorms this afternoon and again Monday afternoon in the Sierra and far western Nevada. The potential for stronger downslope winds has increased this afternoon for the Surprise Valley and far western Nevada where W/SW gusts of 45-50 mph are conceivable. Locally higher gusts up to 55 mph are possible for wind prone areas. Another windy day is in store Monday, especially across western Nevada south of US-50 and lower elevations of Mono County where afternoon gusts of 45-55 mph will be common. Elsewhere, winds will be dampened by shower activity but may see occasional gusts near 40 mph. Potential wind impacts include bumpy flights into and out of regional airports, choppy lake waters and hazardous boating conditions, difficult driving conditions for high-profile vehicles, and blowing dust near playas and desert sinks. After a brief lull late Monday night, another band of rain and snow will sweep across the region on Tuesday. This wave will be weaker than the previous, but may provide another 8-12" to Sierra ridges and 2- 6" of snowfall to Sierra communities by Wednesday morning. Snow levels will fall below valley floors as the storm`s cold core moves overhead, but snow will struggle to accumulate. Tuesday afternoon also looks favorable for pellet showers and thunderstorms. The remainder of the week will feature chances of showers each day, but we look to dry out heading into the weekend. -Salas && .AVIATION... Periods of rain and snow showers will lower CIGS/VIS to MVFR/IFR conditions at Sierra terminals through Monday with heaviest snowfall Monday morning and afternoon. Expect runway accumulation of 6-10" at KTRK and KTVL through Monday with 1-4" at KMMH. A few light showers may reach Sierra Front terminals through the rest of today, but there`s better potential for spillover showers Monday morning when MVFR or occasional IFR conditions are most likely for KRNO/KCXP/KMEV. There is also a 10-20% chance of thunderstorms within 10 miles of all regional terminals today and Monday afternoon. LLWS and mountain wave turbulence will also remain a concern through Monday as FL100 winds strengthen to 45-55 kts by Monday morning. Surface gusts up to 40 kts are expected this afternoon and again Monday afternoon for Sierra Front terminals. -Salas && .AVALANCHE... Aside from a few minor tweaks, the forecast remains largely on track. Refer to the previous discussion below for more details: * SWE and SLRs: Up to 1.25" of SWE along the highest peaks in the Tahoe Basin today, otherwise 0.25-0.5". Locally lower in Mono County, with SWE up to 0.5" along the highest peaks. The second wave Monday brings 1.5-2.5" SWE for the Tahoe Basin and 1-2" for Mono County (highest in northern Mono County). SLRs for both waves will range from 9-12:1 with the lowest SLRs late this afternoon. * Snow levels, totals, and rates: Snow totals today have up to 12 inches for the Tahoe Basin, and locally lower for Mono with less than 8 inches. Monday will bring up to 3 feet of snow for the Tahoe Basin, with 12-24" for northern Mono County and up to 18 inches near Mammoth Lakes. The heaviest snowfall rates will take place Monday between 5am and 5pm with 1-2"/hr expected. * Ridgetop winds: Winds will remain elevated through this storm system, with westerly wind gusts up to 100 mph along ridgetops. * Lightning: There is a 10-15% chance for lightning today (primarily for the Tahoe Basin) with a 10-20% chance Monday and Tuesday. -Giralte/Salas && .REV Watches/Warnings/Advisories... NV...Wind Advisory until 8 PM PDT this evening NVZ003-005. Winter Storm Warning from 5 PM this afternoon to 11 PM PDT Monday NVZ002. Winter Weather Advisory from 5 AM to 11 PM PDT Tuesday NVZ002. Lake Wind Advisory until 5 PM PDT this afternoon NVZ002. Lake Wind Advisory until 11 PM PDT this evening NVZ004. CA...Wind Advisory until 8 PM PDT this evening CAZ070. Winter Storm Warning from 5 PM this afternoon to 11 PM PDT Monday CAZ071-072. Winter Weather Advisory from 5 AM to 11 PM PDT Tuesday CAZ071- 072. Lake Wind Advisory until 5 PM PDT this afternoon CAZ072. Winter Weather Advisory from 11 PM this evening to 11 PM PDT Monday CAZ073. && $$

111 FXUS66 KSTO 302052 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 152 PM PDT Sun Mar 30 2025 .Discussion... .Synopsis... A strong system will continue to impact the region through Tuesday evening, bringing widespread rain, heavy mountain snow, gusty southerly winds, and isolated thunderstorms. Another system late Tuesday night into Thursday has trended significantly weaker with only light showers currently expected over the foothills and Sierra. .Key Messages... * Today-Tuesday evening: Winter Storm Warning for the northern Sierra and southern Cascades above 3500 feet 5 PM this evening to 11 PM Tuesday. Snow levels fall 5000-6500 feet, lowering to around 3000-4000 feet by Monday evening, then falling to around 3000 feet by early Tuesday. 48-hour Probability of snowfall > 12 inches: 85-100% above 5000 feet along Sierra/southern Cascades. Probability of snowfall > 24 inches: 50-95% above 5000 feet along Sierra/southern Cascades. * Wind Advisory for the Valley until 8 AM Monday. Wind gusts up to 40-50 mph; strongest winds expected through tonight. * Slight 10-35% chance of thunderstorms in the Valley/Foothills today through Tuesday in the afternoon/evening. Best chances on Monday. * Wednesday-Thursday: A much weaker system enters the region, with some light showers over the foothills and Sierra. Little to no impacts are expected. * Drier and warmer weather returns late week into next weekend. .Changes from previous forecast... * Winter Storm Warning for the Coastal Range and Shasta County mountains 8 PM tonight to 5 PM Tuesday. * Gusty winds have trended stronger over a larger area today into Monday AM. Wind Advisory has been expanded to include the southern Sacramento and northern San Joaquin Valleys. && .AVIATION... VFR conditions across interior NorCal until around 17z this morning, then MVFR/IFR conditions as a weather system moves through the area. Periods of Valley rain, isolated thunderstorms, and lower ceilings will introduce MVFR/IFR conditions for the next 24 hours. Surface winds below 12 knots, until around 17z today then southerly wind gusts up to 35 knots; strongest in the northern Sacramento Valley, and mountain wind gusts up to 45 knots. Moderate to heavy mountain snow forecast to begin around 12z today and continue beyond 12z Monday. && .STO WATCHES/WARNINGS/ADVISORIES... Winter Storm Warning from 8 PM this evening to 5 PM PDT Tuesday for Mountains Southwestern Shasta County to Western Colusa County-Shasta Lake Area / Northern Shasta County-West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park. Wind Advisory until 8 AM PDT Monday for Central Sacramento Valley-Northern Sacramento Valley-Northern San Joaquin Valley- Southern Sacramento Valley. && $$

353 FXUS65 KMSO 301843 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 1243 PM MDT Sun Mar 30 2025 .DISCUSSION... KEY MESSAGES: - Mountain snow Monday night into Tuesday morning may again cause winter driving conditions in southwest MT above 3500 feet. - Active pattern with cool and showery weather most of this coming week. Pass level snow impact potential during overnight/morning periods. - Ridging returns around April 6th, warmer and drier for several days. Shower activity begins again this evening from our next system. Snow levels during this system will remain 4500 to 5000 feet, with area mountain passes receiving a couple inches. Monday will remain convective with isolated thunderstorms possible. Monday evening models are spinning up another mid-level low over southwest MT. Additionally, the models have continued their trend of increasing precipitation amounts and lowering snow levels. A mix of rain and snow may be possible Tuesday morning in the valleys, while overnight Monday a few inches of snow is expected to accumulate at Lost Trail, Homestake, and MacDonald Passes creating periods of winter driving conditions. If traveling during this period please check future forecasts for updates. Active spring weather continues through April 6th, with periods of sun, clouds, showers, graupel, and an isolated thunderstorm. The short term forecast will be better for predicting short waves that may increase precipitation chances. High pressure returns, potentially just briefly, on the 6th with warming temperatures and drier conditions. && .AVIATION...Broken clouds today will become showers this evening, with showers beginning at KSMN, KHRF, and KMSO between 31/0000 and 31/0600z. KGPI and KBTM showers will hold off until after 31/1100z. Monday instability increases and an isolated thunderstorm is possible. Snow levels lower overnight and KSMN, KHRF, and KMSO may receive a mix and rain and snow which will cause short term visibility reductions. A period of light snow is expected at KBTM after 01/0000z causing reduced visibility and lowering ceilings, along with minor accumulations. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. && $$

007 FXUS65 KBOI 310318 AFDBOI Area Forecast Discussion National Weather Service Boise ID 918 PM MDT Sun Mar 30 2025 .DISCUSSION...Cooler air aloft is moving over the area this evening, with scattered showers across eastern OR and southwest Idaho. A strong upper level trough remains off the Oregon coast. This upper level trough will continue to slowly move inland by Tuesday, bringing colder air aloft to the area. The cold air aloft will help create unstable conditions with scattered showers and isolated thunderstorms through Tuesday. Gusty winds up to 40 mph possible with showers and storms on Monday afternoon as strong W-SW winds aloft are mixed down to the surface. Some of the showers may also produce graupel on Monday afternoon and Tuesday afternoon with the heating of the day. Current forecast on track with no updates. && .AVIATION...Mainly VFR. Scattered showers and isolated thunderstorms will move across the area tonight. Shower and thunderstorm coverage will increase on Monday as a cold front moves through. Snow levels 5- 6kft overnight, falling to 4-5kft on Monday. Periods of MVFR conditions in rain with MVFR/IFR in snow. Mountains obscured at times. Surface winds: SE-SW 5-15 kt, becoming SW-NW 10-20 kt with gusts 25-35 kt by Monday afternoon behind the front. Winds aloft at 10kft: SW 25-45 kt. KBOI...Mainly VFR. Scattered showers overnight resulting in low VFR ceilings. A 10% chance of a thunderstorm until 31/06Z. Showers increasing after 31/15Z with a 20% chance of thunderstorms through Monday afternoon. Surface winds: SE 5-15 kt, becoming NW 5-15 kt with gusts to 25 kt after 31/18Z. && .PREV DISCUSSION... SHORT TERM...Tonight through Tuesday night...Cool and occasional showery/breezy conditions will continue through Tuesday night. Light precipitation along a warm front has reached SE Oregon and will progress eastward and into SW Idaho this evening. Most areas will only receive sprinkles or flurries along the front. Instability behind the front will bring showers and isolated thunderstorms in SE Oregon this evening and SW Idaho tonight. The bulk of the showers are expected across the north, generally north of a Burns-Boise-Jerome line. Brief moderate-heavy rain (snow in higher elevations) will accompany the thunderstorms and stronger showers, along with gusty winds and small hail/graupel with the thunderstorms. Showers expand in coverage on Monday due to short wave embedded in a moist/unstable southwest flow aloft. In addition to the showers, there is a slight chance of thunderstorms...capable of producing gusty winds, small hail/graupel, and brief heavy precip. Snow levels lower to 4000-5000 feet with additional snow accumulations in the higher elevations, especially in areas of more persistent/heavier showers. The showers decrease Monday night as the short wave exits to the east. An upper low off the coast moves inland on Tuesday, crossing into SE Oregon in the afternoon. The system will provide more showers to the area, along with a slight chance of afternoon thunderstorms once again. Snow levels near valley floors rise to around 4000 feet later in the afternoon. Light snow accumulations are possible in portions of SE Oregon, which could make for slick roads in the morning. Winds will be breezy to locally windy at times each day through Tuesday while temperatures run 5 to 10 degrees below normal. LONG TERM...Wednesday through Sunday...Our region will be within the "backside" of an upper level trough Wednesday, bringing a continuation of showers, mainly to the mountains. Snow level will be around 4000 ft MSL and the chance of precipitation varies from 40-80% in the mountains to 10-30% in lower elevations. One final weak shortwave trough is expected Thursday, with snow levels down around 3000 ft MSL in the morning, rising to around 4000 ft MSL in the afternoon. The chance of precipitation is very close to that on Wed. This pattern will result in below normal temperatures both days. North to NE flow aloft will build into the region Friday through Sunday as a ridge axis moves onto the coast and then closes off to our north. This should bring dry weather and warming temperatures, with highs rising to near normal Friday, and 5 to 10 degrees above normal Sat and Sun. Models are in well-above- average agreement on the developing pattern and therefore this is relatively high-confidence forecast. && .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 DISCUSSION...KA AVIATION.....ST SHORT TERM...BW LONG TERM....SP

972 FXUS65 KLKN 301950 AFDLKN Area Forecast Discussion National Weather Service Elko NV 1250 PM PDT Sun Mar 30 2025 .SYNOPSIS...Active weather returns over the silver state tomorrow with strong gusty winds and precipitation. Active potential for rain and snow showers each day this week, lasting through the weekend and into next week as well. && .SHORT TERM...Tonight through Monday Calm night with winds becoming light and temperatures in the 30s before the next active weather moves in over the state early Monday morning. The active weather begins over northern Nevada early Monday morning with chances of up to 50-80% in northern Nevada and 25-50% in central Nevada along the US-50 (southern part of N. Nye County including Tonopah expected to remain dry, below 20% chance). Potential for slight instability might lead to hearing some thunder. Much of the precipitation is expected to fall as rain from high temperatures reaching into the 40s for northern Nevada, 50s in central Nevada. Amounts expected to be good with this system with I-80 corridor seeing up to 0.1-0.15 inches of rain as well as in Eureka, and mountains seeing up to 0.2-0.4 inches of rain (Ruby Mountains up to 0.3-0.75 inches of rain). Central Nevada along US-50 corridor will see up to 0.04-0.1 inches of rain. Snow expected to return for much of the higher elevations and mountains with snow levels around 6000 feet, seeing up to 2-5 inches of snow (Ruby Mountains, up to 3-9 inches). Some higher elevations along route 225 in northern Nevada could see up to 1 inch of snow from the cooler air and proximity to Jarbidge Wilderness Area, for rest of valleys and higher elevations, snow is not expected to accumulate until the overnight ours as much cooler air behind the front expected to drop snow levels below 5000 in the evening, then below 4000 feet overnight. Much of the snow is not expected to accumulate with higher elevations seeing up to 1 inch of snow, valleys could see a trace to 0.2 inches. Strong breezy westerly winds associated with the front expected to increase in the afternoon at 20-25 mph for northern Nevada, gusts 30-35 mph, while stronger winds in central Nevada at 30-35 mph, gusts 40-50 mph. Winds are expected to be elevated until the evening hours. && .LONG TERM...Tuesday through next Sunday. Broad upper trough will be draped over the western United States on Tuesday with a shortwave expected to the northwest of the state. A weak shortwave ridge will quickly move through the flow during the late morning and afternoon with a short break in the active weather during the day. However, daytime heating will act to destabilize the atmosphere as cold air remains aloft. Have added isolated thunderstorms for mainly locales north of I-80. Highs will remain on the chilly side with readings in the 40s, to perhaps reaching 50 degrees in central Nevada. Winds will be out of the west and breezy with gusts to 35 to 40 mph. Isolated to scattered showers will continue during the overnight with light accumulations expected. Overall amounts Tuesday into Wednesday remain roughly up to an inch possible in the valleys up north, with possibly one to two inches in central Nevada and northern Elko county. Lows will be in the 20s. Models continue to depict the longwave trough over the western United States on Wednesday and Thursday. This will keep the threat for light showers over the area, though there will be intermittent breaks from time to time. Winds each afternoon will be breezy but not expected to reach wind advisory thresholds. Highs will generally be in the 40s to low 50s for both afternoons while overnight lows dip into the 20s. Model simulations remain on a highly amplified ridge developing off the west coast Friday through Sunday, with a rex-type block setting up over the Pacific Northwest. Details still need to be worked out but have kept shower activity going on Friday with a slow drying out period during the weekend. Highs will gradually warm but this remains low confidence at this time due to the placement of various features. Highs will be in the 50s and 60s with lows in the 20s and 30s. && .AVIATION...VCSH will continue into the early evening hours across all TAF sites except KPTH, which will remain dry. VFR conditions can be expected through the overnight period. A weather system approaching the Pacific Northwest will bring strong to very strong winds to all locations late Monday morning and afternoon. SW20-30G35-45KT will develop. These winds could produce BLDU with reductions to VSBY and CIGs, but timing and occurrence too low to place in forecast. Increasing chances for showers are expected after 12Z/Monday in the north, which will lead to worsening flight conditions. && .LKN Watches/Warnings/Advisories... Wind Advisory from 8 AM Monday to 1 AM PDT Tuesday Humboldt... Northeastern Nye...Northern Elko...Northern Lander and Northern Eureka...Northwestern Nye...Ruby Mountains and East Humboldt Range in Elko...South Central Elko...Southeastern Elko... Southern Lander and Southern Eureka...Southwest Elko...White Pine. && $$ 97/86/86