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
- Breezy northwest winds in the afternoon across the western Snake Plain and surrounding terrain today and Wednesday.
- Fair skies with warming temperatures through this weekend.
SHORT TERM /Through Thursday Night/
Issued 232 AM MDT TUE SEP 29 2026 A flattened upper-level ridge continues to build into the region from the west-southwest, promoting mostly clear skies, light winds and chilly temperatures across the area this morning. A surface pressure gradient resides over southwest Idaho today and Wednesday, resulting in breezy afternoon winds across portions the western Snake Plain and surrounding terrain. Otherwise, prevailing dry west-northwest flow aloft is anticipated through the short term as the upper ridge strengthens over the Southwest U.S. Passing clouds will be common for the north, while mostly sunny skies persist for the central and southern areas. Temperatures will trend warmer each day, reaching upper 70s/low 80s for lower elevations by Thursday.
LONG TERM /Friday through Tuesday/
Issued 232 AM MDT TUE SEP 29 2026 The aforementioned upper ridge over the Southwest U.S. will nudge further into the Pacific Northwest Friday through the weekend. Above normal temperatures will continue for SE Oregon and SW Idaho, climbing to the low-mid 80s for lower valleys. Models bring a weak disturbance across the forecast area late Sunday and Monday, increasing cloud cover and precip chances. While NBM/WPC's probability of precipitation remains low during this time, some ensemble members now indicate shower development across southwest/central Idaho on Monday depending on moisture availability. Thereafter, the ridge should rebound on Tuesday, with warm and dry conditions forecast.
AVIATION /12Z Tuesday through Wednesday/
Issued 536 AM MDT TUE SEP 29 2026
VFR. Surface winds: variable up to 10 kt, then W to NW 5-15 kt during the afternoon. Afternoon gusts around 20-25 kt between KBOI-KJER. Winds aloft at 10kft MSL: NW 10-20 kt.
KBOI...VFR. Surface winds: variable around 5 kt, then NW 7-12 kt with gusts around 20 kt this afternoon.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
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