####018004475#### FXUS63 KLBF 032141 AFDLBF Area Forecast Discussion National Weather Service North Platte NE 341 PM CST Wed Dec 3 2025 .KEY MESSAGES... - Light snow ends across southwest Nebraska by this evening, with dry conditions persisting through the end of the workweek. - Temperatures moderate into tomorrow and Friday, with highs in the 40s returning for much of western and southwest Nebraska. - A system crosses the area this weekend, and could bring light snow to portions of northern Nebraska. Any accumulations look to remain light at this time. && .SHORT TERM /THROUGH THURSDAY/... Issued at 340 PM CST Wed Dec 3 2025 Currently, light snow is gradually waning near and just north of I- 80, with the threat for even light accumulations quickly ending. An arctic front has moved into far southwest Nebraska this afternoon, with temperatures falling into the upper teens to 20s in its wake. As strong surface high pressure continues to spill southwards into western Iowa by tonight, skies will clear from north to south tonight. This, combined with weakening winds with the approach of the surface high will lead to efficient radiation cooling across much of the area. Lows tonight look to fall into the single digits for all, with areas across north central Nebraska approaching 0 by daybreak. Light southerly flow returns tonight across the area, on the western periphery of the surface high. This likely saves the area from widespread lows near/just below zero, with the weak warm advection boosting lows slightly. Still, the combination of cold temperatures and light south winds will lead to wind chills as low as 5 to 10 below zero east of HWY 83 tomorrow morning. By tomorrow, an upper level shortwave will eject across Saskatchewan/Manitoba, with an associated surface low approaching International Falls by tomorrow evening. A trailing surface trough will eject east into the Sandhills tomorrow afternoon, with westerly downslope flow developing in its wake. This will shunt the shallow, cold arctic airmass into eastern Nebraska, with highs returning to the low to middle 40s across western Nebraska. Any light snow accumulations north of I-80 from today should melt amid the increasing warm advection tomorrow afternoon. && .LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/... Issued at 340 PM CST Wed Dec 3 2025 Similar conditions prevail Friday, as dry northwest flow establishes aloft across the Plains. Persistent west-nortwest winds again promotes highs climbing into the middle to upper 40s for much of the area. By Saturday, upper troughing crosses the northern Rockies and into the Plains. Associated surface low pressure will eject southeast out of eastern WY/CO and into the southern Plains with time. As this low ejects southeast, this could lead to a threat for light snow, mainly across portions of northern Nebraska. Guidance remains at odds with respect to the track of surface features, and where snow would be favored. Still, ensemble means point towards at least light snow (~0.5-1.0") for areas north of HWY 2 Saturday into Sunday. This will need to be monitored, though confidence in accumulating snow remains low for now. Broad and persistent northwest flow then establishes across much of the central CONUS into early next week, suggesting a return of drier conditions to the area. Signals also exist for much warmer low level air to be in place, and bring a return of above average temperatures to western and north central Nebraska. && .AVIATION /18Z TAFS THROUGH 18Z THURSDAY/... Issued at 1120 AM CST Wed Dec 3 2025 Widespread low stratus persists into this evening, with widespread MVFR/IFR CIGs expected across western and north central Nebraska. In addition, snow showers will move south through the Sandhills and southwest Nebraska this afternoon, with brief MVFR/IFR visibilities. By this evening, snow and low stratus begins to exit the area, and VFR is expected to return tonight. VFR conditions then prevail into tomorrow afternoon. Winds remain northerly into tonight at 10 to 15kts. Winds then become southerly overnight, at 5 to 10kts. && .LBF WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...Brown LONG TERM...Brown AVIATION...Brown ####018003731#### FXUS66 KSGX 032142 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 142 PM PST Wed Dec 3 2025 .SYNOPSIS... Weak to moderate Santa Ana winds are expected through Friday, with the strongest winds expected tonight into Thursday. Conditions will gradually warm Thursday through the middle of next week. High clouds will occur intermittently through the next week with low clouds unlikely. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... A 1030 mb surface low will develop over the Great Basin today, switching the pressure gradient offshore and bringing periods of Santa Ana winds to the foothills and coastal mountain slopes. Gusty winds out of the northeast to east will become more widespread tonight into Thursday morning. Along and below the coastal slopes of the mountains and through passes peak gusts of 40 to 50 mph, locally up to 55 mph are expected. Northeast to east winds will continue into Friday morning, but with decreasing coverage and strength. Gusts on Friday are expected to peak at 35 mph. Lowest daytime humidity on Thursday and Friday for the valleys and inland coastal areas will fall to 15 to 25 percent. Overnight temperatures tonight will fall into the 30s in wind sheltered valley locations and in the High Desert. Daytime high temperatures will gradually warm Thursday through the middle of next week. Highs Tuesday and Wednesday will be 10 to 18 degrees above average for inland areas. Persistent weak offshore flow into next week will keep low clouds mostly absent from the coast. Periods of high clouds will occur at times. && .AVIATION... 032100Z....Coasts/Valleys/Foothills...SCT to BKN Low clouds have been hanging out along the San Diego coast and Valleys with bases around 2400-5000 FT MSL. North to northeast winds have been gusting 20-30 kts in the foothills and have spread into valleys below the Cajon Pass (including KONT). These winds will strengthen to as high as 45 kts in the foothills after 04Z this evening. Areas of LLWS and MOD up/downdrafts are expected in lee side of the mountains. Strong winds out of the north to northeast will continue through the TAF period, beginning to ease late Thursday into early Friday morning. Higher Mountains/Deserts...VFR conditions today and tonight with a FEW to SCT high clouds around 20000-25000 ft MSL. North to northeast winds gusting 25-40 kts through mountain passes and along east- facing slopes in the San Bernardo and Riverside mountains will slowly weaken temporarily after 00Z Thursday before they increase again after 04Z to 20-30 kts through the end of the TAF period. && .MARINE... No hazardous marine conditions are expected today through Sunday. && .BEACHES... Very high tides will occur each morning today through Friday, threatening coastal flooding, minor tidal overflow and beach erosion. Chances of these impacts are higher this morning and Thursday morning as elevated surf up to 5-6 feet combines with the high tides, mostly in San Diego County. Check the Coastal Hazard Message for details. && .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...Beach Hazards Statement through Friday morning for Orange County Coastal Areas-San Diego County Coastal Areas. PZ...None. && $$ PUBLIC...CO AVIATION/MARINE/BEACHES...Villafane ####018003288#### FXUS65 KBOI 032143 AFDBOI Area Forecast Discussion National Weather Service Boise ID 243 PM MST Wed Dec 3 2025 .SHORT TERM...Tonight through Friday night...The atmosphere is expected to direct a system up and over the ridge of high pressure to our west beginning mid day Thursday through the remainder of the short term period. Current satellite depicts a broad swath of moisture ahead of this Pacific system, and model data is in good agreement that widespread precipitation is expected. Guidance hints that precipitation will arrive in eastern Oregon by mid day Thursday then into southwest Idaho by mid/late afternoon. Snow levels will initially be near valley floors early in the day, rising to above 5500 feet overnight into early Friday. There exists uncertainty with how long the low level cold pool will remain in place across the Treasure Valley and Weiser Basin. This could push back the changeover from snow to rain in these areas. Guidance suggests a 10% chance of 0.1 inches of snow for the Lower Treasure Valley and a 30% chance of at least 0.5 inches of snow for the Weiser Basin. Current guidance does not include accumulating snow in other lower valley locations, such as the Upper Treasure Valley of Idaho, but the chance of snow falling is above 60%. By early Friday morning all areas below 5500 feet will have transitioned to rain. For the mountain valleys, including the Long Valley of Idaho, guidance suggests a 30% chance of greater than 4 inches of snow late Thursday through the afternoon Friday. Travelers along Highway 55 and Highway 21 in southwest Idaho should be prepared for winter conditions. We will be monitoring for the need to issue a winter weather related advisory for portions of the central mountains of Idaho. .LONG TERM...Saturday through Wednesday...Unsettled conditions will continue through the weekend and into early next week as moisture continues to stream over the top of the Pacific ridge of high pressure. There is strong agreement amongst ensemble model data that two periods of mountain snowfall are possible, one Saturday through Sunday Night, and the second Tuesday into mid week. Snow levels are expected to linger between 4500 and 6000 feet this weekend, before rising to around 7000 feet by Tuesday. Travelers and recreators should anticipate winter-like conditions in the mountains and along mountain roadways during this period. && .AVIATION...Areas of IFR/LIFR fog/low stratus tonight into early Thursday morning, mainly near KBNO, mountain valleys, and north of the Western Magic Valley. Otherwise, VFR conditions. Surface winds: W-NW 5-10 kt, becoming light and variable overnight. Winds aloft at 10kft MSL: N/NW 10-20 kt. KBOI...VFR. A 15% chance of MVFR/IFR fog/low stratus Thursday morning, with a higher chance along the foothills. Surface winds: NW around 5 kt, becoming light and variable overnight. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise SHORT TERM...MC LONG TERM....MC AVIATION.....CH