textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Breezy winds continue into Monday, especially through the Snake Plain, and Ontario to Baker City.

- Not as hot Sunday through Tuesday. The heat returns by midweek with temperatures back above normal.

SHORT TERM /Through Tuesday Night/

Issued 333 AM MDT SUN AUG 2 2026 Southwesterly flow aloft will remain today as the upper-level trough that brought the cold front moves east in the southern Canadian provinces. Monday and Tuesday, ridging will begin building over the Pacific NW coast and slowly moving east towards the area. Winds will remain gusty through this morning (25-35 mph) across northern Malheur / southeastern Baker counties, eastward through the Snake Plain. This afternoon, wind gusts of 25 to 35 mph are forecast across open and elevated terrain of SE Oregon and the Snake Plain of Idaho. Monday will see breezy but lighter winds with gusts remaining under 30 mph. Sunday and Monday will be cooler than the previous few days, with high temperatures around 10 degrees below normal (low-mid 80s for the valleys). The mornings will be cool as well, with lows in the low-to-mid 50s in the valleys Monday and Tuesday mornings. Starting Tuesday, afternoon high temperatures will begin to rise again as the upper-level ridge builds in. Widespread wildfire smoke concentrations are expected to remain lower today with the increased wind speeds, however increased fire activity has been seen overnight post-dry cold front. Smoke is expected to increase in coverage and intensity again Monday onwards as winds decrease.

LONG TERM /Wednesday through Sunday/

Issued 333 AM MDT SUN AUG 2 2026 Hot and dry conditions are forecast to continue developing as the Desert Southwest ridge builds northward over the area. This will bring a return to above normal temperatures starting Wednesday and continuing through the weekend. Without smoke, this will put lower elevations in the mid-upper 90s, however west- northwest flow aloft and light winds near the surface would be favorable for smoke to collect from nearby fires. Similar to this last week, the tradeoff for not quite as hot in the extended period will be due to greater smoke coverage/density.

AVIATION /12Z Sunday through Monday/

Issued 553 AM MDT SUN AUG 2 2026

Some improvement in surface visibility due to increased wind speeds, but areas of low VFR/MVFR will continue as PNW wildfires remain active. Surface winds: W-NW 10-20 kt with gusts 20-25 kt. Winds aloft at 10kft MSL: SW 15-30 kt.

KBOI...Periods of low-VFR surface visibility due to wildfire smoke. Surface winds: NW 5-15 kt. Gusts to 20-25 kt in the afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

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