130 FXUS66 KSEW 260231 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 725 PM PDT Fri Apr 25 2025 .SYNOPSIS...Broad surface high pressure will remain in place through the weekend with gradually cooling temperatures A frontal system will move through Monday night into Tuesday brining a chance for light precipitation. Temperatures look to warm once again late-week as an upper level ridge establishes itself over the region. && .SHORT TERM /TONIGHT THROUGH MONDAY/...An increase in high clouds this evening but overall, not much change from 24 hours ago as upper level ridging remains in control of the weather over W WA. Widespread temps in the 60s, with some water adjacent locations in the mid to upper 50s as of 7 PM PDT. As expected on a quiet evening, inherited forecast remains on track and as such no evening update will be needed. For additional forecast details, please refer to the Previous Discussion section below. 18 From Previous Discussion...Mostly clear skies this afternoon with quite a bit of cirrus blanketing western Washington. Highs on track to reach the low 70s across most of the region, with upper 60s along the coast. Mostly clear skies continue through the weekend with gradually cooling temperatures each day: highs in the mid to upper 60s, lows in the 40s. Onshore flow may be noticeably breezy at times Saturday and Sunday afternoon with gusts up to 25 to 30 mph, particularly west of Olympia and through the Strait of Juan de Fuca. Split flow aloft this weekend with an upper level low to the south will give way to more zonal flow by Monday, allowing an upper level shortwave trough to skirt by to the north over British Columbia. This will bring an weak surface cold front across the area Monday night into early Tuesday, bringing for chances for light rain. Snow levels above 5500 to 6000 ft will mean rain for all mountain passes. Monday will also be the coolest day, with highs in the upper 50s to near 60. .LONG TERM /TUESDAY THROUGH FRIDAY/...Showers will gradually taper off through the day on Tuesday, with the best chances for rain continuing across the mountains. An upper level ridge will build in the system`s wake Wednesday and continuing into Thursday, allowing for a return to warmer temperatures. Highs Thursday look to build to the low to mid 70s. Another upper level trough looks to approach the area Friday into next weekend, but there are differences in the timing as well as how far south the trough is expected to dig. In the forecast, slight chances for precipitation return Thursday night into Friday. && .AVIATION...Dry weather across western WA tonight and Saturday as an upper level low spins to our south (over CA). The flow aloft is light and variable. Onshore flow will increase overnight with low level stratus clouds covering the coast (with IFR conditions likely). Low clouds will burn back offshore by mid to late morning. A stronger onshore push will bring stratus clouds farther inland Saturday night and Sunday. 33 KSEA...Northerly winds still in the 10-15 kt range this evening before starting to ease to 4-8 kts after 04Z. Winds easing further and becoming variable 09-12Z, then becoming W to SW by 18-21Z 5-10 kt. 33/18 && .MARINE...NW to W flow over the coastal waters and Strait of Juan de Fuca where Small Craft Advisories are in effect. Expect another strong push through the strait Saturday evening. A weak front will cross the waters later Monday and into Tuesday. 33 && .HYDROLOGY...No river flooding is expected over the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 5 AM PDT Saturday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from 6 PM Saturday to 6 AM PDT Sunday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory until 6 PM PDT Saturday for Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. Small Craft Advisory until 6 AM PDT Sunday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm. && $$

163 FXUS66 KPQR 260440 AFDPQR Area Forecast Discussion National Weather Service Portland OR 940 PM PDT Fri Apr 25 2025 .UPDATED AVIATION DISCUSSION... .SYNOPSIS...Upper level low over northern California will shift east through the evening into Saturday. The position is increasing southeasterly flow ushering in moisture aloft. General onshore flow will continue through mid week despite a ridge of high pressure forming Monday. Another short wave moves in on Tuesday with another chance for precipitation. && .SHORT TERM...Now through Monday Night...Clouds are beginning to dissipate in the northern portions of the forecast area while the southern potions remain under dense cloud cover. These clouds have been an inhibiting factor to significant daytime heating like we saw yesterday. However, where skies have cleared, seeing about a degree an hour of warming. To the south, a low aloft is spinning over Northern California. This low continues to be the main weather maker today as it encourages southeasterly flow and wrap around moisture. While radar has showed showers throughout the area, accumulation has been minimal. This is mainly due to the significant amount of dry air right at the surface and above 5000 ft. The precipitation has had the opportunity to evaporate before reaching the ground (this is called virga). Overnight the low will shift east slowly which will enhance the precipitation potential more. Based on high resolution models, there is good consensus in precipitation falling along eastern Lane and Linn counties through Saturday morning. Accumulation expected to be highest along the lee side of the Cascades. Because conditions will be showery, exact accumulation is difficult to narrow down. Under stronger showers where the atmosphere is moist enough, precipitation will be higher. In contrast, there are many areas that will see little to no accumulation. In addition to the precipitation, the east-west pressure gradient will reach around 10 mb. Expect gusty westerly winds through the Gorge, especially in the Upper Hood River Valley. Onshore flow persists through the week which will keep temperatures moderated.-Muessle .LONG TERM...Tuesday through Friday...The weak ridge will break down on Tuesday as a eroding shortwave trough advects inland from the Northeast Pacific. This shortwave will produce more widespread showers over southwest Washington and northwest Oregon. This is a fairly fast moving system. Humidity between 850-250 mb will dry significantly which can be observed in soundings from the area. This will lead to lower humidity along the mountains and clear skies. On Wednesday, the ridge will intensify and a thermal trough will form along the coast. Winds aloft (above 850 mb) will transition to the northeast bringing in warmer air from east of the Cascades. In the afternoon the trough will shift east of the Cascades, then back to the west side in the evening. The Willamette Valley temperature forecast has fairly good agreement in the long term. The warmest of the next week will be Thursday (when the ridge is at it`s peak). The NBM shows a high temperature range in Eugene of 76-80 degrees F. Along the coast, that range is in the upper 60s. Will mention though that the potential downsloping effects off of the coast range could cause temperatures to be higher around Tillamook. In fact, in Hood River, the forecast is showing the 25th-75th percentile of temperatures at 80-82 degrees F which is incredibly narrow. -Muessle && .AVIATION...VFR flying conditions continue across much of the region as coverage of high clouds has increased from the east. A large upper-level low continues to spin over inland California, although rain showers will likely remain south of the region. The highest chances, 20-40%, for rain will be over the central Oregon Cascades, with less than a 15% chance of rain reaching EUG, and less than 10% elsewhere. Therefore, no impacts from light rain showers are expected at area terminals. Low-level cloud cover will otherwise increase across the region, with MVFR cigs favored at all terminals overnight. At inland sites, confidence in MVFR cigs is highest to the south, with a 60-80% chance for continued MVFR cigs at EUG through 18-20Z Sat. Both the duration and likelihood of MVFR cigs lessen to the north, with the shortest duration in the Portland area between 11-18Z Sat. Winds of 3-8 kt out of the south to southwest this evening will turn out of the northwest after 16-20Z Sat at all Willamette Valley terminals. Along the coast, persistent MVFR cigs are likely for much of the period, and as inland, there is higher confidence to the south. At ONP, MVFR cigs are very likely throughout the period, and there is 40-60% confidence in continued IFR cigs through 18-20Z Sat. To the north at AST, IFR cigs are expected overnight, most likely from 09-14Z Sat, with MVFR cigs otherwise favored through 20-22Z Sat. A brief improvement in flying conditions after 18-22Z Sat will give way to renewed MVFR/IFR conditions after 02-03Z Sun. Northwest winds at 5-10 kt will continue through tonight, before increasing to 10-15 kt with gusts to 20 kt after 18-22Z Sat. PDX AND APPROACHES...VFR conditions expected to continue into tonight beneath increasingly cloudy skies. There remains a 40-60% chance of MVFR cigs at 2-3 kft after 11-12Z Sat, continuing through mid-morning. VFR conditions will again be favored after 18Z Sat as low clouds dissipate. No vis restrictions are anticipated throughout the period. Winds around 5 kt out of the southwest overnight will turn out of the west to northwest, increasing to 5-10 kt after 16-18Z Sat. -Picard && .MARINE...Winds gradually shifting northwest through this afternoon, with wind speeds increasing by tonight. Gusts may approach 25 kt by late this afternoon, particularly in the outer zones. This uptick in winds is coinciding with a building westerly swell, pushing combined seas toward 10 to 11 feet by Saturday. As a result, Small Craft Advisories will be in effect for all waters by this afternoon, with conditions likely persisting through at least Saturday. By late Saturday night and into Sunday, both winds and seasons will begin to ease as high pressure weakens slightly and moves inland. The start of next week looks to be rather quiet, with seas around 5 to 7 feet and wind gusts under 20 kt. -Hall/JLiu && .PQR WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. PZ...Small Craft Advisory from 2 AM Saturday to 2 AM PDT Sunday for PZZ251>253. Small Craft Advisory until 2 AM PDT Sunday for PZZ271>273. && $$ www.weather.gov/portland Interact with us via social media: www.facebook.com/NWSPortland x.com/NWSPortland

688 FXUS66 KMFR 260445 AFDMFR Area Forecast Discussion National Weather Service Medford OR 945 PM PDT Fri Apr 25 2025 .DISCUSSION...The current forecast remains on track. A few isolated thunderstorms popped up this afternoon, but most lightning activity stayed east of the CWA. Widespread showers continue tonight around a low pressure system passing over central California, with Coos and Curry counties seeing less activity given the easterly flow pattern. Showers look to continue into Saturday morning. Activity west of the Cascades will start to ease on Saturday afternoon. East of the Cascades, thunderstorm chances have been adjusted slightly to include Modoc and eastern Siskiyou counties for late Saturday afternoon into Saturday evening. Chances are still slight (~15%) at the highest, with updated guidance showing an expanded area for possible thunderstorms. Rain showers east of the Cascades are forecast to continue into early Sunday morning. Please see the previous discussion for more details on the long- term forecast. -TAD && .AVIATION...26/00Z TAFs...Widespread showers mainly east of the I-5 corridor with isolated thunderstorms will gradually move from east to west this afternoon, gradually pivoting and moving from northeast to southwest this evening and overnight. This is resulting in some low end VFR conditions mixed with MVFR and widespread terrain obscurations. MVFR conditions are likely to become more widespread this evening and overnight as shower activity continues. The thunderstorm potential should wane after sunset, and in the meantime an isolated thunderstorm could impact the Medford and Klamath Falls terminals. Will monitor and update as needed. For areas west of the I-5 corridor and along the coast, a mix of MVFR/IFR conditions prevail. Showers and isolated thunderstorms should remain east of these areas, but some light rain will be possible in the Umpqua Basin and Illinois Valley. IFR/LIFR conditions are expected along the coast and into the Umpqua Basin overnight. Conditions should improve to at least MVFR Saturday morning. /BR-y && .MARINE...Updated 235 PM Friday, April 25, 2025... Northerly winds will increase tonight and steep short period waves will develop Saturday causing conditions hazardous to small craft. Steep seas persist Saturday night despite winds easing a bit. A thermal trough maintains northerly winds and steep seas, highest south of Cape Blanco Sunday into much of next week, with peak winds and waves in the afternoons and evenings. -Spilde && .PREV DISCUSSION... /Issued 239 PM PDT Fri Apr 25 2025/ DISCUSSION...Showers are spreading across Klamath and Lake counties. there are also a few cells developing near the California/Oregon border with a small thunderstorm at the Klamath/Jackson County border. Temperatures are facing a 5-10 degree cooldown compared to yesterday in valleys this afternoon with temperatures only reaching the low/mid-60s at the warmest. The upper low is starting to move into the west coast to the south into California. The shower activity will continue moving in from the south today with more of it reaching areas east of the Cascades. These will become more widespread tonight as it continues through portions of Southern Oregon and into areas west of the Cascades. Later this afternoon there is a 20-30% probability to see some thunder for parts of Jackson and Klamath counties. The best chance for thunder will be in eastern Lake County with the HREF proposing a 30-40% probability this evening. Saturday afternoon convection will also be focused on portions of Lake County, so there is a 15-25% probability added for that area with forecast CAPEs 100-250 J/kg. Snow levels will be falling to around 6,000-6,500 feet Saturday afternoon, meaning that higher elevations including Crater Lake and the Warner Mountains in Modoc County will have some snow. Otherwise, later Saturday afternoon will have rain showers that focus on areas in Siskiyou County and up through Klamath and Lake counties. Ensembles are favoring ridging to set into the PNW early next week, and dry conditions are favored through the first half of the work week. A warm up will be felt with highs back to normal/slightly above normal by Monday. The warming will continue through the week with current probabilities for 80 degrees in west side valleys reaching 70-90% next Thursday. -Hermansen && .MFR WATCHES/WARNINGS/ADVISORIES... OR...CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory from 5 AM Saturday to 5 AM PDT Sunday for PZZ350-356-370-376. && $$

969 FXUS66 KEKA 252215 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 310 PM PDT Fri Apr 25 2025 .SYNOPSIS...Showers activity will increase this evening. Scattered to numerous showers across the area through Saturday, with lingering showers through Sunday morning. Breezy northwest winds will developed along the coast and exposed ridges Saturday through Sunday. Dry and warming trend Sunday through mid next week. && .DISCUSSION...A closed low center located just near 39N and 127W continue to track southeast toward central California through Saturday. This is promoting above normal moisture values across across Northwest California, especially along the North Coast this afternoon. Diurnal heating are promoting isolated showers are already around the Yolla Bolly. There is some shallow instability this afternoon with a cold air aloft over Trinity capable of produce moderate showers bands. For the rest of the day, showers activity are expected to increase in coverage this evening with increasing low to mid level moisture as the aforementioned low moves closer. Expect scattered to numerous showers across the area through Saturday, with periods of moderate rain rates. Precipitation will tapper off from north to south Saturday evening as the trough eject the area, with lingering showers through Sunday morning. Saturday`s high temperatures are forecasted to be 5 to 15 degrees below normal. ECMWF Extreme Forecast Index (EFI) highlight highs in the 60th-80th percentile below normal temperatures on Saturday, especially for the interior areas in southern Humboldt, interior Mendocino and Lake County. Overnight temperatures are expected to remain in the 40s across the valleys due to lingering low level moisture. Breezy northwest winds will developed along the coast Saturday afternoon through Sunday as a surface high pressure begin to builds in and tighten the pressure gradient. Gusts from 25 to 35 mph are forecast for the coastal headlands and exposed ridges, with strongest winds over the more prominent exposed terrain. HREF probabilities indicates there is a 50 to 75% chance of wind gusts greater than 30 mph for the North Coast Saturday evening, then increasing chance up to 50% across the Mendocino Coast late Saturday night. Sunday, clearing skies are expected and temperatures will start to warm back up again as a high pressure begin to builds in downstream in the wake of the trough. Inland areas are expected to see highs in the 60s. Areas of valley fog are expected to develop Sunday night into Monday. High pressure continues to build in through the week with highs around 80 for the inland areas by Wednesday. Ensemble clusters and deterministic models shows the high pressure shifting eastward on Thursday. Most of the cluster members (78%) suggest an upper level trough approaching the area next Friday. However, there is uncertainties with the position of the low and if there will be any impacts to our area. ZVS && .AVIATION...Upper level low spinning around near 39N 127W will continue to track southeastward toward central California tonight through Saturday. Multi-layered cloud cover and moist air will continue to wrap around the low center into the area tonight through Saturday, resulting in mostly MVFR conditions. Periods of IFR conditions are also expected for mostly coastal areas with a steady low level NW flow and a shallow humid layer. The occurrence of wrap around precipitation will increase the chance for IFR and MVFR conditions outside the terminal aerodrome airspace. Surface pressure gradients will begin to tighten on Saturday as the low tracks southeastward while high pressure builds toward the NW California coast. Gusty north-northwesterly winds and low level turbulence are anticipated for coastal aerodromes, especially at KCEC, in the afternoon. DB && .MARINE...Wave spectrum remained heavily skewed toward shorter period bands (less than 10 seconds) today. Multiple long and mid swell groups from the SW and W were also present and contributing much less to the total sea state which has been 4 feet or less. A lighter NW wind regime (5 to 15 kt) is forecast to continue for tonight and Friday with steep seas continuing on a downward trend. Marine conditions are forecast to deteriorate this weekend and remain hazardous into at least early next week. On Synoptic scale, a weak and diffuse surface low over NRN California outer offshore waters (150-250NM) SW of Cape Mendo is forecast to move southeastward tonight through Saturday into central California offshore waters. Surface high pressure is forecast to build toward the Pac NW Saturday afternoon resulting in a tighter pressure gradient over NW CA coastal waters. Model derived 10 meter winds continue to show variability with the rate of increase and location of the speed max. Leaned toward the ARW and FV3 and the HREF mean with strongest wind max over the northern waters around Pt St George during the afternoon and early evening hours. Coverage and duration of gale gusts over 34kt appears limited for a gale warning at this time. Steep northerly wind waves will build during the late afternoon and peak around 10 ft around 9 seconds. This will be borderline for a low end hazardous seas warning for primarily the outer waters or 10 to 60NM from shore into Sunday morning. Our spring time northerly wind regime featuring locally strong northerly winds around Pt St George and in the lee of Cape Mendo as well as steep northerly waves near 10 ft will most likely stick around on Sunday into early next week. DB && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 3 PM Saturday to 9 AM PDT Sunday for PZZ450-455-470-475. && $$ 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

154 FXUS66 KMTR 260416 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 916 PM PDT Fri Apr 25 2025 ...New UPDATE, MARINE... .SYNOPSIS... Issued at 1247 PM PDT Fri Apr 25 2025 Cool, cloudy, and for some, rainy conditions are forecast over the next 24 hours. Significant impacts due to rain or isolated storms are not anticipated. Some mountain top snow is also forecast across the Santa Lucia Range. Sunday and into next week appear rain-free with a slight warming trend. Thereafter, the upper air pattern may support opportunities for light rain next weekend. && .UPDATE... Issued at 912 PM PDT Fri Apr 25 2025 The surface low pressure centered about 220 miles to our west continues to meander to the SE tonight. Light showers are mostly diminishing aside from some lingering showers over terrain. A line of heavier showers currently seen on radar will continue towards the Central Coast overnight. Much of the Central Coast south of the Monterey Bay should see some measureable rainfall through sunrise Saturday. The current forecast remains on track with no updates needed this evening. Behringer && .SHORT TERM... (This afternoon through Saturday Night) Issued at 1247 PM PDT Fri Apr 25 -Short Term Key Messages *Cool and cloudy conditions *Showers and isolated thunderstorm chances *Mountain top light snow Showers will continue this afternoon and evening across southern portions of the Bay Area as well as the Central Coast. The primary culprit appears to be a couple of PV anomalies along the 2PVU surface rotating around the main upper low/trough. Rain will still remain on the "lighter" end and 12 hour rainfall amounts have largely tallied around a few hundredths of an inch across the region. As the main upper trough digs southward, we`ll see a re-invigoration of marine showers that will slide eastward. Guidance has been rather insistent on the Big Sur Coastline being the favored region for convection and given the range in the forecast, I`ll nudge PoPs upward. As the upper low continues to pinwheel down the Central Coast, some modest 850-700mb WAA or trough of warm air aloft may result in some precipitation across the North Bay early Saturday morning. Currently, the greatest PoPs reside down across the Central Coast with rain chances ranging from 60-70% with PoPs around 30-50% across the North Bay. This leaves the heart of the Bay Area in a minimum PoP wise, but even here, a few sprinkles or light showers will remain possible (albeit around 20%). As far as the potential for isolated thunderstorms, this remains a possibility, though the probability is diminishing. Forecast soundings indicate lapse rates may not be quite as steep (likely do to some slight shifts in the location of the coldest air aloft), but still supportive of more vigorous showers with a few isolated lightning strikes. For now, have confined the risk for a few storms to southern Monterey and San Benito counties. At this time, widespread severe weather is not anticipated, but brief bouts of accumulating hail may result in slick driving conditions. There still remains an opportunity for some snow across the higher terrain of the Santa Lucia Range and potentially portions of the Diablo Range. Overall, not anticipating much in the way of significant impacts due to snow. && .LONG TERM... (Sunday through next Thursday) Issued at 1247 PM PDT Fri Apr 25 2025 -Long Term Key Messages *Lingering rain chances on Sunday Morning *Modest warming trend, `Minor` HeatRisk next week A slight change to the long term forecast and there now remains a potential (20-30% chance ) for lingering precipitation after sunrise Sunday. As the upper low departs, large scale ascent should ramp down. However, low level moisture remains plentiful and there`s still an opportunity for largely light drizzle with some breezy conditions (10-20 mph wind gusts) as the surface pressure gradient remains a little tight. Longer term model projections support a handful of days that will be dominated by shortwave ridging. This will mean a gradual warming trend, with "minor" HeatRisk returning. This type of heat isn`t overly impactful, except to those that are exceptionally sensitive to heat (very young and elderly). As we progress into the first weekend of May, there are some signs that the pattern evolve such that a couple of upper troughs slide through the area. This may mean additional rain chances in the day 8-10 time frame according to a couple of the ensemble clusters. For now, we`ll hold serve with a largely rain-free forecast given the time of year and the consensus of a dry period among a majority of the NWP. Of course, early May rains will be beneficial as it pertains to delaying the start of our dry/spring fire season. && .AVIATION... (00Z TAFS) Issued at 700 PM PDT Fri Apr 25 2025 Scattered light rain continues this evening as an upper level low tracks south along the California coastline this evening. VFR is expected to prevail, with some cigs lowering to MVFR if a shower passes overt the terminal. Vicinity of SFO...VFR conditions are expected to prevail through the overnight with occasional drops to MVFR if/when a shower passes over the terminal, especially early Saturday morning when an increase in rain coverage around the Bay Area is possible. VFR is expected for the remainder of the TAF period from Saturday afternoon onward. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Rain coverage is expected to gradually increase across the Monterey Bay area overnight into early Saturday morning but still be scattered in nature. There is slight chance for an isolated thunderstorm, but confidence is too low for mention in the TAF. Expect VFR conditions to prevail through the forecast period with occasional cig drops into MVFR if a rain shower moves over any of the terminals. .MARINE... (Today through Wednesday) Issued at 842 AM PDT Fri Apr 25 2025 A chilly upper level low arriving from the northwest will result in scattered showers across the coastal waters and bays today through Sunday morning. Gusty northwest winds and rough seas return across the northern outer coastal waters late Saturday. Dry weather returns early next week due to an eastward moving high pressure system over the Pacific. && .MARINE... (Tonight through next Thursday) Issued at 912 PM PDT Fri Apr 25 2025 Shower activity over coastal waters is easing this evening after sunset and the center of the upper level system continues its track southward. Rough seas are expected to develop Saturday afternoon and evening with breezy north winds across the northern waters. High pressure begins to build in by the end of the weekend into next week. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory from 3 PM to 9 PM PDT Saturday for Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...Bain LONG TERM....Bain AVIATION...JM MARINE...JM 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

408 FXUS66 KOTX 260457 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 957 PM PDT Fri Apr 25 2025 .KEY MESSAGES... -North ID and the eastern WA will have chances for showers Sunday through Tuesday while central Washington will remain largely under the influence of a rain shadow. -Isolated lightning with showers Sunday and Tuesday. -Sunday through Tuesday will feature seasonably breezy west winds. && .SYNOPSIS... Warm and mainly dry weather is expected through Saturday with high temperatures in the upper 60s and 70s. A breezy weather regime is expected Sunday through Tuesday with showers concentrated mainly over north Idaho. Warmer and drier weather will return late next week. && .DISCUSSION... Tonight through Sunday: A weak-low pressure system will move through the region this weekend, bringing a chance of showers and thunderstorms to parts of southeast WA and the ID Panhandle on Saturday. Some storms could produce brief heavy rain, lightning and small hail. Sunday will see scattered showers and a 30% chance of storms mainly in northeastern WA and the north ID Panhandle. Rainfall will be hit or miss, but breezy winds up to 35 mph will be more widespread across the region, especially across the Columbia Basin, Palouse, and near the Cascade gaps. Monday through Tuesday: Early next week will start mostly dry Monday, with increasing clouds and rain developing overnight into Tuesday. Tuesday will have widespread showers and isolated thunderstorms, especially in eastern WA and north ID. Some gap areas mainly near the Cascades and southeast WA could see the most rain. Winds will be breezy both Monday and Tuesday, with gusts up to 30 mph in open areas. Wednesday through Thursday: By midweek, conditions will improve with decreasing rain chances and more sunshine expected Wednesday and Thursday. Winds will calm down, though some breezy winds will continue near the Okanogan Valley and the Cascades. Temperatures will stay above normal through most of the week, with highs in the 60s and 70s, with a few 80s possible in the LC Valley by Thursday. Overnight lows will dip into the 40s, with cooler valley spots brielfy dropping into the upper 30s Tuesday night./KK && .AVIATION... 06Z TAFS: VFR conditions are anticipated at every TAF site through the forecast period. Winds will shift to the west or southwest and become breezy Saturday afternoon. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence in VFR conditions at TAF sites through the period. ----------------------- Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance For additional probabilistic information for NWS Spokane airports, please refer to the Aviation Dashboard on our webpage: https:/www.weather.gov/otx/avndashboard && .Preliminary Point Temps/PoPs... Spokane 45 74 44 73 43 68 / 0 0 0 10 0 0 Coeur d`Alene 43 73 42 70 41 64 / 0 10 0 10 10 0 Pullman 44 70 44 65 41 63 / 0 10 10 0 0 0 Lewiston 50 76 49 71 46 70 / 0 20 10 10 0 0 Colville 40 77 41 73 40 70 / 0 10 0 10 0 0 Sandpoint 43 73 43 68 41 64 / 0 10 0 30 30 10 Kellogg 45 69 46 65 43 62 / 0 10 10 20 20 10 Moses Lake 45 81 47 76 44 74 / 0 0 0 0 0 0 Wenatchee 50 79 48 73 48 71 / 0 0 0 0 0 0 Omak 45 80 46 76 43 72 / 0 0 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... WA...None. ID...None. && $$

055 FXUS66 KPDT 252351 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 451 PM PDT Fri Apr 25 2025 .Updated for Aviation... SHORT TERM...Today through Sunday night...An upper-level low that is currently just offshore of northern California will drive shower and thunderstorm chances this afternoon and Saturday afternoon as it slowly pushes inland over the Great Basin region through the forecast period. Tangible weather transitions to breezy to windy westerly winds through the Cascade gaps, especially the eastern Columbia River Gorge and Kittitas Valley late Saturday through Sunday as cross-Cascades pressure gradients tighten in response to an incoming shortwave and cross-Cascade temperature gradient (warm east side, cool west side). This afternoon and evening, shower and thunderstorm chances will ramp up across the southern portion of our CWA, primarily in central OR, the Ochoco-John Day Highlands, and portions of the southern Blue Mountains. Convection is ongoing in southeast OR, and isolated activity has developed in Klamath County. Through this afternoon, additional development is likely (75% chance) across central and southeast OR. Storm motion will generally be northwest to west. Farther north across the southern Blue Mountains and portions of the northern Blue Mountains and Wallowas, more isolated showers and thunderstorms will be possible, but unlikely to be more than isolated to scattered (10-30% chance of showers, 5-14% chance of thunder). Saturday, CAMs are advertising an earlier start to convection (12-1PM PDT), for most of the Blue Mountain region. The highest chance of thunderstorms will be along the eastern edge of our CWA in Grant, Union, and Wallowa counties. This afternoon and Saturday, weak effective shear (generally 10-20 kts) should keep the threat of severe storms low (<2% for all hazard types from SPC`s daily outlooks). Late Saturday through Sunday night, winds will increase in magnitude from the west. NBM probabilities currently suggest a good chance (widespread 50-70%, locally higher) of advisory-level wind gusts through the eastern Columbia River Gorge and Kittitas Valley, and portions of the lower Columbia Basin of Oregon, north- central Oregon, the Simcoe Highlands, and the foothills of the southern Blue Mountains. Lastly, the warm temperatures will lead to some river rises, with the Naches River at Cliffdell currently forecast to reach action stage Saturday through the remainder of the forecast period. Plunkett/86 LONG TERM...Monday through Friday... Key Messages: 1. Widespread showers Monday evening through Tuesday morning. 2. Breezy winds Monday and Tuesday afternoon/evening. 3. Elevated river levels through the week. *Hydrologic Statement Issued* The extended period is characterized by an upper level shortwave trough Tuesday that will be followed by an upper level ridge that will continue through the remainder of the week. This will lead to widespread rainfall beginning along the Washington Cascades Monday evening before including the Oregon Cascades overnight and extending across the Basin through the early morning hours on Tuesday. Rain is expected to linger across the Washington Cascades and the eastern Mountains through the afternoon. Rain amounts of 0.10-0.20" are likely over the northern Blue Mountains, 0.05-0.10" across the Blue Mountain foothills and the John Day Basin, and 0.01-0.05" through the Lower Columbia Basin and Central Oregon. Confidence in these rain amounts is currently moderate 50-60% as 59% of ensemble members advertise slightly less rain amounts Monday evening through Tuesday afternoon as associated with a weaker incoming upper level shortwave trough, which is more favored by the ECMWF solution. The variance between ensembles is currently rather low, +/-0.03", hinting at the overall difference in shortwave trough strength being minor between ensembles and deterministic guidance. The approaching system will also lead to elevated winds across the east slopes of the Washington Cascades, Gorge, Southern Blue Mountain Foothills, Simcoe Highlands, and Kittitas Valley associated with a pressure gradient developing along the Cascades on Monday and the passing shortwave on Tuesday. West- northwest sustained winds of 15 to 25 mph with gusts up to 40 mph will be possible both days across the aforementioned areas. Confidence in these wind values is moderate to high (60-70%) as the NBM suggests a 50-70% chance of gusts reaching 40 mph or higher both days and a 20-40% chance of reaching advisory-level criteria (45 mph gusts or greater). The best chance (40% chance) for winds reaching advisory-level resides across the Kittitas Valley Monday, with chances dropping slightly (33%) Tuesday. The more moderate to high confidence with winds is associated with the lack of large variance between ensemble members and deterministic guidance. Even though there is slight differences between shortwave strength, this only results in 55% of ensemble members hinting at a 1-4 mph increase in winds - which is primarily focused over the Kittitas Valley. Warm and above normal temperatures coupled with incoming precipitation this weekend and into the early part of the workweek has attributed to elevated river levels, with the Naches River near Cliffdell forecast to reach action stage Saturday at 11 AM and continuing to stay in action stage through the remainder of the week. As a result, a Hydrologic Statement has been issued as there is a greater than 95% chance of reaching action stage and less than a 5% chance of reaching Minor Flood Stage. Temperatures will stay above normal through the week, cooling 3 to 5 degrees Monday to Tuesday behind the passing upper level shortwave. A warming trend then unfolds through the remainder of the workweek as upper level ridging moves into the Pacific Northwest and southwest flow develops into Thursday. These synoptic features will allow high temperatures to break into the low 80s across lower elevations of the Columbia Basin starting Thursday. 75 AVIATION...00Z TAFS... VFR conditions are expected through the TAF period. Latest radar showed some SHRA mainly south and east of BDN and RDM. These SHRA could impact both locations through the evening hours. There is also a low (<20%) chance of a TSRA at either location through the evening. The other TAF sites are expecting nothing more than a passing shower, if that. Winds will be mainly 10 kts or less except for DLS, which will have gusty winds 20 to 25 kts through the period. && .PRELIMINARY POINT TEMPS/POPS... PDT 49 74 45 69 / 10 10 0 0 ALW 50 72 48 69 / 10 10 0 0 PSC 47 80 46 76 / 0 0 0 0 YKM 49 80 46 75 / 0 0 0 0 HRI 48 79 46 73 / 10 10 0 0 ELN 48 75 47 68 / 0 0 0 0 RDM 43 69 35 63 / 50 20 0 0 LGD 48 69 44 65 / 20 30 10 10 GCD 46 66 42 65 / 70 60 20 10 DLS 51 72 44 65 / 10 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...86 LONG TERM....75 AVIATION...77

323 FXUS65 KREV 252013 AFDREV Area Forecast Discussion National Weather Service Reno NV 113 PM PDT Fri Apr 25 2025 .KEY MESSAGES... * A late season storm is bringing mountain snow, valley rain, thunderstorms, gusty winds, and much cooler weather today and lasts through the weekend. * Prepare for occasional travel disruptions in and across the Sierra, as well as mountain passes in Mineral and Southern Lyon counties. * Warmer and drier weather prevails early next week with chances of showers and storms returning by midweek. && .DISCUSSION... A low-pressure center is making it`s way toward the California coast, where it is expected to drop a bit south before it crosses the Sierra. The colder air, light showers and grey skies this morning were a preview of this storm, which will be around the area through Sunday evening. Let`s take a look at some storm specifics... * PRECIPITATION: Snow levels will trend lower through the day, as this cool damp airmass settles in. Look for snow levels to drop to 5,000 to 6,000 feet this evening, and remain there until around Sunday afternoon, when they finally climb above 6,000 feet. As such, a reinforcing shot of Sierra snow is developing, with the bulk of the snow arriving for Saturday. Below the snow lines, any snow or mix that accumulates on the ground will melt/dry off rather quickly due to recent warmth and high sun angle. Above the snow lines, today`s accumulations will be limited. Area passes may see up to 1 inch, while peaks such as Mt. Rose could grab an additional 2-3 inches. For Saturday, a 10 to 20% chance for an embedded lightning strike accompanies a 15 to 30% chance for showers. Snow levels will determine the precipitation type, so below 5000 feet, rain. Above 5000 feet, we could see snow amounts of up to a foot on the highest peaks, while Sierra passes could gather another 4 to 6 inches. Then Sunday, we could see an additional 2 to 3 inches on passes. Mountain tops such as Mt.Rose could add 2 to 4 inches on Sunday, since the bulk of the energy will be working eastward throughout Sunday afternoon and evening. * WINDS: Mostly westerly with a nudge toward northwesterly winds Saturday and Sunday, with ridge gusts only around 20-25 mph for afternoons. Sunday looks a bit breezier, with ridge gusts approaching 30 mph across northwestern Nevada. Areas seeing precipitation this weekend will likely stay under light winds, with the exception being in the vicinity of any storm that develops, where gusty outflows may create a brief gusty period. Beyond the weekend, we start a steady warming trend with the new week. Temperatures across the area will climb to 70s and 80s for western Nevada valleys, while Sierra locations will see 60s. A showery pattern emerges at the end of April/ beginning of May. HRICH && .AVIATION... * A late season winter storm will spread lower elevation rain and higher elevation snow across the region this weekend, with peak rates tonight into Saturday morning. Most terminals will see periods of rain/snow throughout the weekend, with a 10-20% chance for afternoon thunderstorms. Widespread terrain obscuration due to lowering ceilings should be anticipated. * While KRNO/KCXP/KMEV will remain rain, snow levels will fall tonight with snow anticipated at KTRK/KTVL/KMMH. However, the chances for accumulation will depend on time of day and rate, with tonight being the most likely chance (60%) for slushy accumulation of up to a couple inches. * Generally, winds won`t be a major concern with peak gusts from the W/SW of 20-25 kts each afternoon and lighter terrain driven winds overnight. If thunderstorms do develop, gusty and erratic winds up to 35 kts are possible. -Dawn && .REV Watches/Warnings/Advisories... NV...Winter Weather Advisory from 5 PM this afternoon to 11 AM PDT Sunday NVZ001-002. CA...Winter Weather Advisory from 5 PM this afternoon to 11 AM PDT Sunday CAZ072-073. && $$

119 FXUS66 KSTO 252006 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 106 PM PDT Fri Apr 25 2025 For additional details on weather and expected impacts over the next 7 days, please visit weather.gov/sto/briefing. .Discussion... .Synopsis... A cool, cloudy, breezy and sometimes wet weekend setting up over the area. Biggest impact from the system will be snowfall above 6000 feet in the Sierra later tonight into early Sunday. Conditions dry out starting later on Sunday through early next week before a weak system moves across the area Wednesday with light precipitation and another weaker system next weekend. && .Key Messages... * Saturday and Sunday: -Cool with breezy to gusty onshore winds -Widespread showers (most precipitatoin below 0.15" and thunderstorms (10-20%) this evening and continuing through Sunday. -Snow expected above 6000 feet late Friday through early Sunday -60-75% probability of 4 inches or more of snowfall above 6000 feet along Sierra/southern Cascades, 30-50% of 6 inches or more. * Monday-Wednesday: -Warming trend begins along with drier weather -Slight chance of light showers mountains Wednesday .Changes from previous forecast... * No changes && .AVIATION... Mostly VFR conditions across interior NorCal next 24 hours, with some periods of MVFR/IFR in rain showers and isolated thunderstorms after 21z Saturday. South to west winds up to 12 to 14 kt, with gusts up to around 20 kts for TAF sites through 06z Saturday, then south to west winds generally below 12 kts. && .STO WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory from 5 PM this afternoon to 11 AM PDT Sunday for West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park. && $$

429 FXUS65 KMSO 252020 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 220 PM MDT Fri Apr 25 2025 .DISCUSSION... KEY MESSAGES: - East winds to continue into this evening, but should end by Saturday morning - Saturday will be the warmest day this week, but chance of showers and thunderstorms increase in the afternoon and evening - Cooler and wetter pattern anticipated by Sunday into Monday. Snow accumulations possible above 5000 feet Sunday night into Monday morning across southwest Montana East winds remain in place today and will likely strengthen this evening into the overnight hours for locations exposed to an easterly wind direction, such as Missoula valley. Winds are anticipated to decrease by Saturday morning and trend more south to southwesterly. High pressure will begin to break down on Saturday as a low pressure system moves into the Great Basin and begin to eject northeastwards. This will set up southwest flow across western Montana and north central Idaho. Warm temperatures are anticipated, however increasing moisture will also allow for cloud cover and showers/thunderstorms by afternoon and evening. Due to the dry low levels of the atmosphere, showers and thunderstorms that develop will be capable of winds gusting 30 to 40 mph. Sunday into Monday will see a marked drop in temperatures as the upper level low moves into southern Idaho and Wyoming. Forecast models continue to show the best dynamics and precipitation favoring the Continental Divide into southwest Montana and Lemhi County (south of Interstate 90 and east of Highway 93). Middle of the road forecasts for these areas (25th to 75th percentile) show 48 precipitation amounts ranging from 0.25" to 0.75" by Monday morning. Further north and west, precipitation will be more showery in nature which will lead to a large variation in precipitation amounts. One concern for this system will be for snowfall to occur into lower elevations than the forecast currently represents Monday morning. Climatologically, patterns like this have been know to produce snow into the valley locations of southwest Montana. While confidence in this scenario playing out is relatively low (10-20 percent) locations such as Butte, Anaconda and Philipsburg could potentially receive light snow accumulations by Monday morning, particularly if the system slows down and moisture phases better with incoming colder air. Mountain passes (MacDonald, Georgetown Lake, Homestake, Bannock, etc) have a 60 percent chance of accumulating snow during this timeframe. If you have travel or outdoor plans, consider monitoring the forecast this weekend. Cool, breezy and overall active weather will continue into the early part of next week. Confidence remains high for ridging to develop by Thursday-Friday however. This will allow for another period of warm and dry weather. && .AVIATION... The upper level flow pattern will be transitioning to southern today as a weak low pressure moves off to the east and a stronger low pressure moves into to central California. Some moisture and energy will move northward causing a few showers across portions of central Idaho into southwest Montana. KSMN has the best chance of experiencing showers within the vicinity of the terminal. While the remainder of the terminals should have fair flying conditions. Easterly winds will remain over western Montana and north central Idaho, and will likely strengthen some this evening between 26/0000z and 26/0600z. KMSO and KBTM will likely feel the brunt of these winds with gusts up to 25 kts. Saturday will see increasing clouds and showers/thunderstorms migrating further north by afternoon. Wind gusts to 30 kts will be possible with convection. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. && $$

739 FXUS65 KBOI 260246 AFDBOI Area Forecast Discussion National Weather Service Boise ID 846 PM MDT Fri Apr 25 2025 .DISCUSSION...Weak convection is still occurring around the area, with a few heavier showers over the Boise Mountains and near the Owyhee Mountains. Earlier this evening, we had several strong rain showers/weak thunderstorms and a gust front over southern Malheur County, Southwest Highlands, and the Magic Valley. Winds as high as 58 mph were recorded with the stronger storms, and small hail was observed, mainly near the NV border. Rain showers will continue through the evening mainly over the northern portions of our CWA. A few thunderstorms will linger tonight, mainly near the NV border. The strong upper level low will swing south of us tomorrow and then up into our region by Sunday, continuing to advect moisture over our region through the weekend. Precipitation chances will continue through Monday morning, with cooler temperatures anticipated Sunday. No updates to the forecast. && .AVIATION...Mostly VFR. Scattered to isolated showers tonight in a line northwest of KBNO-KBOI and near NV border, redeveloping tomorrow afternoon mainly near KREO-KBNO. Brief MVFR conditions possible in showers/thunderstorms. Low confidence in morning valley fog, with low ceilings and mountain obscuration in Eastern Oregon. Surface winds: variable less than 10 kt through overnight, becoming NW-NE 10-15 kt tomorrow afternoon. Winds aloft at 10kft: S-SW 15-30 kt. .KBOI... VFR. Low patchy stratus near the foothills tomorrow morning, becoming dry with mid level clouds through the day. Surface winds variable less than 8 kt overnight, becoming N-NW 5-10 kt by Sun/00Z. .SUNDAY OUTLOOK... Mainly VFR. Active weather through the weekend, with isolated afternoon showers and thunderstorms throughout the area. Showers/thunderstorms may result in areas of MVFR, mountain obscuration, and gusty outflows. Winds mostly NW-NE 10-20 kt with gusts to 30 kt by Sunday afternoon. && .PREV DISCUSSION... SHORT TERM...Tonight through Sunday night...Thunderstorms began shortly after noon MDT in southern Owyhee County. Hi-res models show them increasing and moving north through the evening, then collecting in eastern Oregon overnight. NamNest, in particular, shows a line of storms around 6 PM MDT extending through Rome/OR-Mountain Home-Glenns Ferry-Fairfield, shifting north. This line is forecast to pass through the Boise metro around 7 PM MDT. Expect wind gusts to 50 mph and brief heavy rain. In the NamNest model the line is narrow and should pass through any location in less than one hour. Pcpn should continue through the night in eastern Oregon. QPF has increased tonight compared to previous model runs, and nearly all of them have at least .10 inch tonight. After a break Saturday, showers and thunderstorms should increase Sunday as the main Pacific upper low tracks inland and across northern Nevada. At the same time, an upper through will be tracking eastward along the Canadian border, with the Nevada low and the northern trough roughly in phase with each other. Showers and thunderstorms should become more numerous Sunday in our Idaho zones as the upper low and trough pass by. Total QPF tonight through Sunday has increased to .50 to 1.00 inch near the Nevada border, around 50 inch in the Boise Mountains and Camas Prairie, .20 to .30 inch in Harney and Malheur Counties, around .25 inch in the Snake Basin, and less than.20 inch in our northern-most zones, farthest from the Nevada low. Daytime high temps this weekend will be slightly cooler than today`s highs, while nights will be mild due to extensive cloud cover. Northwest winds will increase to 15 to 25 mph Sunday in eastern Oregon, gradually working into western Idaho late Sunday. LONG TERM...Monday through Friday...The back end of the closed low is expected to continue pushing east through the early hours of Monday as a ridge builds in from the northwest, bringing warmer and drier conditions Monday. A weak shortwave trough will dig across the area Tuesday, steering a northwest flow that will cool valley daytime temperatures into the lower 60s. Precipitation chances sit at 20-60% on Tuesday, with most expected over higher elevations. A strong ridge will build in across the region from Wednesday to Friday, returning drier and warmer than normal conditions. Valley daytime temperatures are expected to climb into the lower to mid 70s Wednesday to Friday, with snow levels generally in the 6000-7000 ft range before rising to around 9000 ft on Friday. && .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...SA AVIATION.....SA SHORT TERM...LC LONG TERM....JY

991 FXUS65 KLKN 260300 AFDLKN Area Forecast Discussion National Weather Service Elko NV 800 PM PDT Fri Apr 25 2025 .SYNOPSIS...A large, slow-moving low pressure system will bring active weather for this afternoon through Monday. A shortwave trough will bring light precipitation to northern Nevada next Wednesday, and a third low is set to bring precipitation next weekend, marking an active end of April and beginning of May for the Silver State. && .UPDATE...Winds have decreased below advisory criteria, though breezy conditions may persist at times overnight. Therefore, the Wind Advisory for White Pine, Northeastern Nye, and Northwestern Nye Counties has been allowed to expire as scheduled. && .PREV DISCUSSION... /issued 1253 PM PDT Fri Apr 25 2025/ SHORT TERM...Today through Saturday A large upper-level low is currently positioned off the California coast, bringing precipitation to Nevada. The low will move ashore tomorrow and begin to shift northeast towards the Silver State. Instability, lift, and increased moisture from the low will increase our chances of thunderstorms this weekend. The main thunderstorm hazards will be lightning strikes and gusty winds from thunderstorms. Southwest winds reaching 15-20 kts with 30-35 kt gusts are expected this afternoon and tomorrow afternoon in central NV. Little accumulation is expected today and tomorrow, but more precipitation is forecast Sunday and Monday as the system moves closer to the state. && LONG TERM...Sunday through next Friday An upper-level area of low pressure will progress northeastward across Eastern Nevada Sunday. This cyclone aloft will move eastward into the Great Basin Sunday night, before opening up into a trough of low pressure over the Rockies Monday. A few strong thunderstorms are possible throughout Northern and Central Nevada Sunday afternoon into Sunday evening. The primary thunderstorm hazards will be dangerous cloud to ground lightning strikes and wind gusts near 45 mph. Periods of valley rain and mountain snow are expected Sunday into Monday morning. One to three inches of snow are anticipated over passes and summits along Highway 50 Sunday morning and Sunday afternoon. Here are probabilities of one quarter of an inch of rain or more for select locations in Northern and Central Nevada from 5 AM PDT Sunday, April 27th, 2025 until 5 AM PDT Monday, April 28th, 2025: Owyhee - 88% Spring Creek - 81% Winnemucca - 81% Carlin - 81% Elko - 76% Battle Mountain - 76% Wells - 71% Orovada - 71% McDermitt - 70% Jackpot - 64% A ridge of high pressure will move eastward across the Silver State Monday night. A trough of low pressure will progress eastward over the Pacific Northwest Tuesday and Tuesday night. The southern extent of this trough of low pressure may brush Northern Nevada Tuesday afternoon and Tuesday evening, resulting in a chance of precipitation. Any precipitation that does fall Tuesday afternoon and Tuesday evening will remain north of the Interstate 80 corridor. Forecast uncertainty increases Wednesday through next Friday as many divergent pressure patterns are depicted by various numerical models. && AVIATION...A few showers may be in the vicinity of KWMC this afternoon into this evening. South wind gusts near 35 knots at KELY will decrease to near 25 knots this evening. South wind gusts near 30 knots at KTPH will abate by 04z this evening. Southeast to south wind gusts near 25 knots at KEKO will abate by 01z this evening. VFR conditions will prevail at all terminals. && .LKN Watches/Warnings/Advisories... None. && $$ 89/87/87