textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Smoky conditions continue through the week.

- The heat returns by midweek with near 100 degree temperatures likely at lower elevations.

SHORT TERM /Through Wednesday Night/

Issued 343 AM MDT MON AUG 3 2026 The upper-level shortwave trough that brought gusty winds overnight into early this morning will move east out of the area by early afternoon. Breezy wind gusts are still forecast as this feature moves out, with gusts 20-30 mph east of Boise through the Snake Plain. Temperatures will be seasonably cool today before the next major synoptic pattern starts to build in. Northwest flow aloft will develop behind the shortwave, accordant with upper-level ridging building in across the Pacific Northwest. This ridging will slowly build east across the region starting Tuesday and strengthen further on Wednesday as it starts to build overhead. Winds weaken and temperatures trend warmer starting Tuesday, with both trends continuing further moreso Wednesday.

Areas near/downwind of large fires will continue to deal with thicker smoke through this morning. Starting this afternoon (and especially into evening), the flow aloft shifting to a more northerly component mentioned previously will bring smoke into the area from the large fires in WA. Combined with weakening wind speeds, widespread smoke impacts are expected Monday evening onwards.

LONG TERM /Thursday through Monday/

Issued 343 AM MDT MON AUG 3 2026 The upper-level ridge will further cement itself across the Great Basin / Four Corners region. This will continue hot temperatures daily across the region. Temperatures will be 5-10 degrees above normal with lower valleys near 100 degrees Thursday through Saturday. Conditions will remain dry with seasonal afternoon breeziness. On Sunday, some models are hinting at a possible upper- level trough moving east across the Pacific Northwest. While it doesn't look to include precipitation chances as of this forecast, it would provide increased wind speeds, enhancing fire weather concerns. Otherwise, smoky conditions will continue from area wildfires.

AVIATION /12Z Monday through Tuesday/

Issued 524 AM MDT MON AUG 3 2026

Reduced visibility due to wildfire smoke, with areas of MVFR-IFR and mountain obscuration. Surface winds: W-N 5-15 kt with areas of gusts to 15-25 kt through the afternoon. Winds aloft at 10kft MSL: W 15-30 kt becoming NW 5-15 kt after Mon/15Z.

KBOI...Smoky, low VFR with MVFR at times today. Likely degrading to MVFR-IFR Monday evening. Surface winds: NW 5-15 kt. Afternoon gusts around 20 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Air Quality Alert until 2 PM MDT this afternoon for IDZ011-012- 014-015-029-033. OR...Air Quality Alert until 3 PM MDT /2 PM PDT/ this afternoon for ORZ061>064.