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Forecast Discussion for Boise, ID
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142 FXUS65 KBOI 202133 AFDBOI Area Forecast Discussion National Weather Service Boise ID 233 PM MST Fri Feb 20 2026 .SHORT TERM...Tonight through Sunday night...One more cold night as the main upper trough exits east, then 5-10 degrees warmer Saturday and another 5 to 10 degrees Sunday as a broad Pacific upper ridge comes inland and replaces the trough. Warm-frontal clouds will make Saturday night warmer than tonight along with a slight chance of rain and snow in the northern-most mountains, then decreasing clouds in the warm sector will make Sunday warmer than Saturday. In addition, deep surface low pressure off the coast will produce gusty south or east winds 15 to 30 mph in our CWA Saturday through Sunday, even persisting through the nighttime hours. .LONG TERM...Monday through Friday...Warming continues with strong southwesterly flow aloft as a deep low approaches. Temps on Monday reach around 10 degrees above normal with gusty winds ahead of the precipitation coming that night. Precip chances rise to 50- 90% Monday evening through Tuesday as a strong moisture core passes over the area. Chances are higher over higher terrain, but the warm temps will keep snow levels elevated at about 6 kft MSL. Moderate precipitation totals are likely, with heavier amounts in the mountains favored by strong flow aloft. Temperatures on Tuesday will cool by several degrees. Snow levels drop behind the system on Wednesday morning to 3-5 kft MSL, though much drier air will end the period of widespread precipitation. Lingering showers on Wednesday will clear out by Thursday as the moisture moves north of the area. A slight chance of precipitation remains through the rest of the week, though most deterministic runs shows the moisture staying north of the forecast area. Gusty winds continue each afternoon. && .AVIATION...VFR and low-mid level ceilings. Fog in mountain valleys is possible Saturday morning. Surface winds: SW-NW 5-15 kt with gusts up to 25 kt near KTWF/KJER, becoming S-SE tonight. Winds aloft at 10kft MSL: W 10-20 kt. KBOI...VFR. Surface winds: NW 4-9 kt becoming SE tonight. Weekend Outlook...Mostly VFR. Local IFR fog in mtn valleys each morning. Surface winds: SE 5-15 kt with gusts up to 20 kt, except in highlands and the Snake Plain where gusts up to 30 kt are possible. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise SHORT TERM...LC LONG TERM....JM AVIATION.....JM |
Previous Forecast Discussions may be found at
NWS Boise, ID (BOI) Office Forecast Discussions.
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