textproduct: Boise

KEY MESSAGES

SHORT TERM /Through Tuesday Night/

- Continued hot, dry, and smoky into Tuesday.

- Breezy afternoon winds through Tuesday.

- Gradual cooling through the week.

- Increasing chance of showers and thunderstorms Wednesday and beyond, especially on the Idaho side.

LONG TERM /Wednesday through Sunday/

High pressure will build over the Desert Southwest as a weak trough moves into the West Coast on Wednesday. This will bring southwest flow over the region, which will cool temperatures slightly, as the high pressure center shifts further east. Monsoonal moisture will advect northward, but long range models keep the best chances of associated showers and thunderstorms to our south and east through Thursday. By Friday, models substantially increase precipitation coverage over high terrain through the weekend. The Central Idaho Mountains and high terrain along the Nevada border will see the best chance for showers and thunderstorms (20-40% chance). Warm and breezy conditions will continue through the weekend, with temperatures slightly below normal through the weekend. High temperatures in the valleys will range from the mid to upper 80s through Saturday, with high temperatures in the mountains in the mid to upper 70s.

AVIATION /18Z Sunday through Monday/

Issued 1146 AM MDT SUN AUG 9 2026

Generally VFR with periods of MVFR conditions near KONO-KEUL in thicker smoke from nearby wildfires. Mountains obscured in smoke. High density altitude with hot afternoon temperatures. Surface winds: W-NW 5-10 kt, variable less than 10 kt overnight. Winds aloft at 10kft: W-SW 10-20 kt.

KBOI...MVFR conditions in smoke improving to VFR conditions by mid-afternoon. Foothills obscured in thicker smoke. High density altitude with hot afternoon temperatures. Surface winds: NW 6-8 kt, variable less than 6 kt overnight.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Air Quality Alert until 1 PM MDT Monday for IDZ011>015-028-029- 033. OR...Air Quality Alert until 1 PM MDT /noon PDT/ Monday for ORZ061>064.