Area Forecast Discussion
Issued by NWS Boise, ID
Issued by NWS Boise, ID
097 FXUS65 KBOI 301640 AFDBOI Area Forecast Discussion National Weather Service Boise ID 940 AM MST Sun Nov 30 2025 .DISCUSSION...A cold front has moved through the area with snow showers confined to the NV border, tapering off by noon. North- northwest flow will bring drier air into the area later today with clearing expected. Breezy northwest winds this afternoon with 10 to 20 mph tapering off after sunset. Good radiational cooling tonight with patchy fog and temperatures in the 10s and 20s. Next weak system arrives on Tuesday with scattered light showers in the afternoon and snow levels around 3000-4000`. No updates. && .AVIATION...Snow showers ending area wide. MVFR/LIFR conditions in low ceilngs, mtns obscured. Ceilings lifting and clouds decreasing from W-E through the morning, improving to VFR early this afternoon except lingering MVFR/IFR in low stratus in the Magic Valley and near the Nevada border. Surface Winds: W-NW 5-15 kt with gusts to 20- 25 kt this afternoon in the Snake Plain. Winds aloft at 10kft MSL: N- NW 10-20 kt. KBOI...MVFR/LIFR this morning in low stratus with foothills obscured. Conditions improving to VFR by around 18z with decreasing cloud cover. Surface winds: NW 10-15 kt with gusts to 20 kt this afternoon. && .PREV DISCUSSION... SHORT TERM...Today through Tuesday night...Light snow has come into our CWA about as forecast. Beginning late Saturday evening the main snow band extended from Baker County through eastern Malheur County into the Lower Treasure Valley and Owyhee Mountains. Those areas should receive 1 to 3 inches total snowfall overnight, ending before sunrise. Elsewhere less than one inch is expected. At 2 AM MST radar imagery suggested shadowing in the Upper Treasure Valley, with webcams showing snow and wet roads in Nampa but little or none in Ada County. Latest hi-res models and hourly NBM MOS indicate 3 to 5 AM as the main time frame for snow in the Boise metro. Air temps in the Lower Treasure Valley have been 32 to 35 degrees with roads appearing only wet, so little if any impact on travel is expected. By sunrise the main snow will be in Owyhee and Twin Falls Counties with an inch accumulation likely in the valleys and 2 to 4 inches on the higher terrain along the ID/NV border, generally ending by noon. Skies will be clearing elsewhere from the northwest, and this afternoon should be sunny and melt all the snow at low elevations. Clear skies and lingering low-level moisture due to the melted snow will favor fog formation in the valleys overnight and Monday morning. Otherwise, skies should be mostly clear through Monday. Clouds will increase from the north Monday night ahead of the next upper trough from western Canada. That trough is forecast to bring more snow and low-valley rain Tuesday and Tuesday night mainly on the Idaho side. LONG TERM...Wednesday through Sunday...An upper level ridge centered off the coast will keep northerly flow aloft across our area Wednesday and Thursday. As a result, temperatures will remain near normal with dry conditions. A pattern change is possible as early as Thursday night/Friday, but more likely over the weekend as the ridge weakens. This would allow Pacific moisture to move into the area under nearly zonal flow aloft. Precipitation chances on Friday are around 10-20% in the valleys and 30-60% in the mountains, and increase 10-20% over the weekend. The air mass under westerly flow will be fairly mild with snow levels around 4000-6500 feet, fluctuating with the passage of embedded shortwave troughs. Temperatures are expected to average several degrees above normal. Lower valleys will see precipitation fall as rain, with rain and snow in the mountains. There is potential for significant snow accumulations on the higher peaks. Uncertainty is still high on timing/strength of individual systems as deterministic and ensemble models depict significant variability. However, recent model trends are promising for a wetter pattern to develop by next weekend. && .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.....NF SHORT TERM...LC LONG TERM....ST