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
- Daytime temperatures remaining near normal through Sunday, then warming to around 10 degrees above normal Tuesday through Thursday.
- Breezy afternoons over the next several days.
- Cooler and unsettled conditions possible next weekend.
SHORT TERM /Through Tuesday Night/
Issued 357 AM MDT SUN JUN 21 2026 An upper level trough will remain over Alberta over the next several days with west-northwest flow on Sunday. Isolated showers and thunderstorms will form over the central ID mountains and southern Twin Falls County along the NV border this afternoon. Breezy west-northwest winds this afternoon and again on Monday afternoon. The system over Alberta will slowly move east and upper level ridging will bring warmer temperatures by Tuesday with temperatures warming to around 10 degrees above normal. Subtropical moisture will begin to get injected into the upper level ridge after Tuesday, but westerly flow will keep the deeper moisture to the south and east of our area.
LONG TERM /Wednesday through Sunday/
Issued 357 AM MDT SUN JUN 21 2026 Dry and warm conditions continue into Thursday, with subtropical moisture remaining south and east of the area. Some showers and thunderstorms may form in the central ID mountains and south along the NV border Thursday afternoon. An upper level trough from the Gulf of Alaska will move southeast into the Pacific NW late Thursday. A cold front moves through southeast OR and southwest ID on Friday with cooler and unsettled conditions possible Saturday and Sunday. Still significant model differences in the positioning of this trough, but wetting rains possible next weekend and much cooler temperatures as much as 10-20 degrees below normal.
AVIATION /12Z Sunday through Monday/
Issued 615 AM MDT SUN JUN 21 2026 VFR. Patchy fog in the central ID mountains this morning, diminishing by mid morning. Surface winds: variable 10kt or less this morning, becoming W-NW 5-15kt in the afternoon, strongest near KTWF KJER. Winds aloft at 10kft: westerly 10-20 kt.
KBOI...VFR. SE 5kt this morning, shifting to NW 5-15kt this afternoon.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
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