textproduct: Boise
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
UPDATE
Updated aviation discussion.
KEY MESSAGES
- High temperatures about 10 degrees below normal today with rain and snow showers possible in the west-central Idaho mountains. - Widespread showers late Monday night through Tuesday morning, thunderstorms Tuesday afternoon, then more showers Wednesday mainly on northern mountains. - Warming and drying Thursday through Saturday.
SHORT TERM /Through Tuesday Night/
Issued 319 AM MDT SUN JUN 7 2026 At 2 AM MDT a reinforcing cold front could be seen on satellite extending from NW Montana through Grangeville ID, southwestward through Steens Mountain, to Lakeview OR, supported by a short wave trough from the main upper low in northern WA. The cold front will move eastward through our CWA today bringing further cooling and maintaining gusty west/northwest winds through the day. Monday looks mostly sunny and warmer after the upper trough exits east, and ahead of the next north Pacific cold front forecast to arrive Monday night. That system will bring rain to all areas late Monday night through Tuesday morning, heaviest in northern areas where .25 to .75 inch is expected, including up to an inch of snow above 6000 feet MSL. But .10 to .20 inch of rain should also fall on the Snake Basin. Tuesday's system will exit east later in the day, and Tuesday night should be drier.
LONG TERM /Wednesday through Sunday/
Issued 319 AM MDT SUN JUN 7 2026 One last surface cold front and supporting upper trough Wednesday, with showers from that system mainly in the north. A warming and drying trend is forecast Thursday through Saturday with further upper troughs staying north of our CWA, but close enough for occasional cloudiness in northern areas vs mostly clear skies in the south. A stronger upper trough may bring cooling and gusty winds to Idaho on Sunday but not all models agree on that.
AVIATION /18Z Sunday through Monday/
Issued 1146 AM MDT SUN JUN 7 2026 VFR with increasing high clouds late and overnight. Chance of showers entering eastern Oregon by mid day Monday. Surface winds WNW 10-25 kt with higher gusts, strongest over south central Idaho. Winds aloft at 10kft: west 25-35 kt.
KBOI...VFR with increasing high clouds late this evening and overnight. Surface winds NW 10-20 kt with gusts to 25 kt, becoming SE around 10 kt after 03Z.
BOI WATCHES/WARNINGS/ADVISORIES
ID...Fire Weather Watch until 9 PM MDT this evening for IDZ424-426. OR...None.
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