textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Very hot temperatures Thursday through Saturday.

- Smoky conditions continue through the week.

- Breezy winds Friday through the weekend with very low thunderstorm chances returning along the ID/NV border.

SHORT TERM /Through Friday Night/

Issued 222 PM MDT WED AUG 5 2026 The warming reaches its zenith tomorrow through Saturday, with maximum temperatures in lower elevations above 100 degrees. Even though overnight low temperatures are in the 60s throughout the area providing some relief, a Heat Advisory has been issued due to the very hot daytime temperatures. Some local areas with morning lows around 70 degrees will be under Major Heat Risk Friday and Saturday, while the rest of the area with morning lows in the 60s and 50s see Moderate to Minor Heat Risk. As the driving upper level ridge flattens Friday, afternoon wind gusts pick up especially in Idaho. Beginning friday through the weekend, wind gusts 20 to 30 mph are possible in open areas and ridges. Elsewhere, gusts up to 20 mph are possible.

LONG TERM /Saturday through Wednesday/

Issued 222 PM MDT WED AUG 5 2026 A ridge of high pressure will remain over Utah through the extended period. Temperatures will be 5-10 degrees above normal with lower valleys in the low 100s Saturday. Monsoon moisture will reach far SE Oregon and southwest ID south of the Snake Basin on Saturday afternoon and continue through early next week. Current forecast does not reflect this but there will be a slight chance of thunderstorms along the NV border on Saturday and Sunday afternoons. Westerly flow will suppress the ridge on Monday, bringing slightly cooler temperatures with dry and breezy conditions. Smoky conditions will continue from area wildfires which may keep temperatures slightly cooler than forecast.

AVIATION /06Z Thursday through Friday/

Issued 1156 PM MDT WED AUG 5 2026

Reduced visibility due to wildfire smoke, with areas of MVFR-IFR and mountain obscuration, otherwise VFR. High density altitude each afternoon due to hot temperatures. Surface winds: variable less than 10 kt overnight, becoming WNW 8-12 kt after 18Z. Winds aloft at 10kft MSL: W-NW 5-15 kt shifting to SW 5-15kt by 18z.

KBOI...Wildfire smoke, generally remaining VFR. Mountains obscured at times. Surface winds: variable less than 5 kt, becoming WNW around 10 kt after 18Z Thursday.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Air Quality Alert until 2 PM MDT Friday for IDZ011>015-028-029- 033. Heat Advisory from 2 PM Thursday to 9 PM MDT Saturday for IDZ012-014>016-029-030-033. Air Quality Alert until 1 PM MDT Thursday for IDZ016-030. OR...Heat Advisory from 2 PM MDT /1 PM PDT/ Thursday to 9 PM MDT /8 PM PDT/ Saturday for ORZ061>064. Air Quality Alert until 1 PM MDT /noon PDT/ Thursday for ORZ061>064.