textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Dry with temperatures trending 5-15 degrees above normal through next week.

- Minor disturbance on Monday could bring a showers to higher terrain along the NV border and south-central Idaho mountains.

SHORT TERM /Through Friday Night/

Issued 235 PM MDT WED SEP 30 2026 Dry westerly flow will bring gradual warming through Friday. Efficient radiational cooling overnight will allow for wide diurnal temperature spreads as high temperatures reach 10-15 degrees above normal by Friday. Weaker flow aloft will translate to lighter winds. Wild/prescribed fires, mostly across Oregon at this time, will likely keep haze in the region through the end of the week.

LONG TERM /Saturday through Wednesday/

Issued 235 PM MDT WED SEP 30 2026 The weekend will bring further warming as an upper ridge expands northward from the Desert SW. A weak disturbance forecast to track through the northern Great Basin on Monday will bring a low chance of showers and possibly a thunderstorm to areas along the northern NV border and into s-central Idaho mtns. Otherwise warm and dry conditions will continue through the middle of next week with high temperatures holding 10-15 degrees above normal (low-mid 80s at lower elevations).

AVIATION /00Z Thursday through Friday/

Issued 602 PM MDT WED SEP 30 2026 VFR with mostly clear skies. Local haze due to smoke, mainly north of KBNO-KONO-KMYL, this evening through overnight. Patchy fog in sheltered mountain valleys Thursday morning. Surface winds: W to NW 5-15 kt with gusts to 20 kt through sunset, then mostly light and variable overnight. Winds aloft at 10kft MSL: NW 10-20 kt.

KBOI...VFR with clear skies. Northwest surface winds through sunset with occasional gusts of 15-20 kt. Mostly light and variable overnight through Thursday morning.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.