706 FXUS65 KBOI 112051 AFDBOIArea Forecast Discussion National Weather Service Boise ID 251 PM MDT Sat Oct 11 2025
.SHORT TERM...Tonight through Monday night...An upper trough will move eastward across our CWA this evening. Another upper trough will move southward along the northwest coast Sunday. These troughs will maintain cool, showery weather through Monday. Showers from the first trough will affect northern areas tonight and Sunday morning. Showers from the second trough Sunday afternoon through Monday will stay mainly in Oregon. Snow level will lower to 5000 feet MSL north to 6000 feet south tonight through Monday. Total rainfall through Monday morning will be .25 to .60 inch in northern mountains, .05 to .25 inch in eastern Oregon, and less than .05 inch in southeast Oregon and southwest Idaho. Total snowfall will be up to 4 inches in northern mountains, with little or no accumulation elsewhere. Northwest wind 10 to 20 mph this evening, with gusts to 30 mph in the Snake Basin and in southeast Oregon. Less windy Sunday and still mainly from the west or northwest.
.LONG TERM...Tuesday through Saturday...A cutoff low pressure system is forecast to move over central CA Tuesday and then northeast across NV and over southern ID by Wednesday afternoon. Wrap-around subtropical moisture will impact the forecast area, especially Tuesday night and Wednesday across SW ID and far SE OR where probability of precipitation is 60-80 percent. Snow levels are forecast to be in the 6-8K feet range. The upper low is forecast to pull away from the area Wednesday night and Thursday with a decreasing trend in precipitation in NW flow. A shortwave trough embedded in the NW flow is forecast to move across ID on Friday with a continued chance of precipitation mainly for the northern mountains heading into the weekend. Below normal temperatures are expected through the extended period, especially Wednesday and beyond.
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.AVIATION...Mainly VFR through late afternoon with scattered showers in the Magic Valley diminishing early this evening. Otherwise, VFR this evening and overnight except scattered to numerous showers developing mainly north of the Snake River Plain and in the KBKE area. Areas of IFR/LIFR in showers with mountains obscured at times. Snow level around 6000 feet MSL lowering to 5500 feet late tonight. Surface winds: W-NW 5-15kt. Wind gusts to 15-25kt diminishing in the evening. Winds aloft at 10kft MSL: SW-W 20-30kt.
KBOI...VFR. A 20-25 percent chance of showers overnight. Surface winds: W-NW 10-15kt decreasing to around 5 kt this evening.
Sunday Outlook...North of the Snake River Plain and KBKE area... rain/snow showers continuing with periods of low VFR/MVFR in rain, IFR/LIFR in snow with mountains obscured. Snow levels 5-6kft MSL. Elsewhere...VFR. Surface winds: generally SW-NW 10-15 kt, gusts to 20-25 kt.
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.BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None.
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SHORT TERM...LC LONG TERM....TL AVIATION.....TL
NWS BOI Office Area Forecast Discussion