FXUS65 KBOI 220915 AFDBOI Area Forecast Discussion National Weather Service Boise ID 315 AM MDT Sun Mar 22 2026 .KEY MESSAGES... - Warm, slightly above normal temperatures and dry conditions will continue through the middle of next week. - Another cold front will move through the region midweek, bringing mountain showers and slightly cooler temperatures. && .SHORT TERM /Through Tuesday Night/... Lighter winds and cooler temperatures are expected today, especially compared to the record shattering temperatures last week. Valley highs will reach the low 60s, still 3-5 degrees above normal for this time of year. Dry and partly cloudy skies will continue as a ridge of high pressure builds back in over the region through Monday. Temperatures will climb to 10-15 degrees above normal on Monday and Tuesday, peaking on Tuesday ahead of another week frontal passage. Late Tuesday, an atmospheric river will move into the Pacific Northwest. This will increase chances of showers (30-50%) and cool temperatures slightly across high elevations in southeast Oregon and in the West Central ID Mountains. Models remain consistent in the northward progression of the bulk of the moisture, so confidence is low in any meaningful shift to the weather in area valleys during the short term period. && .LONG TERM /Wednesday through Sunday/... The Gulf of Alaska upper-level trough will continue to cause precipitation chances and gusty winds until late Wednesday/early Thursday. An embedded upper-level shortwave will move a cold front through the area Wednesday afternoon into evening, with precipitation chances (30-50%) limited to higher elevations in our northern zones. Snow levels start around 8000 ft MSL when precipitation begins, before lowering to near 3000 ft MSL by precipitation ending. Beginning Thursday, the upper-level ridge looks to rebuild over the Western CONUS and bring temperatures above normal again (with temps 5-10 degrees above average by Saturday). By Sunday, one cluster solution and some deterministic model runs hint at an upper-level trough moving onshore into the Pacific NW, bringing precipitation and cooler temperatures. && .AVIATION /06Z Sunday through Monday/... Issued 1120 PM MDT SAT MAR 21 2026 VFR conditions with scattered high cloud coverage overnight. Winds will be NW 10 kt or less overnight through Sunday morning, except 10-15 kt with gusts to 25 kt over KMUO, KTWF, and KJER. Winds aloft at 10K feet: W 30-40 kt. KBOI...VFR. Surface winds W-NW 10 kt or less overnight through the afternoon. && .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...SA LONG TERM....CH AVIATION.....JY