textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Dry with a warming trend through Thursday.

- Cold front and gusty winds Thursday evening, followed by breezy and cooler weather Friday.

- Stronger cold front late Saturday with gusty winds, showers, and thunderstorms, then much cooler and windy Sunday.

SHORT TERM /Through Thursday Night/

Issued 200 PM MDT TUE SEP 8 2026 Upper level trough remains over northwest MT today with lingering clouds over the mountains this afternoon. The system will move east tonight, with warmer air and higher heights moving into the area. Temperatures will continue to warm each day through Thursday, with values around 10 degrees below normal today, warming to near normal Wednesday and around 5 degrees above normal Thursday.

LONG TERM /Friday through Tuesday/

Issued 200 PM MDT TUE SEP 8 2026 A dry cold frontal passage through early Friday will bring cooler near-normal temperatures and breezy winds. The approaching parent trough will keep our area in a southwest flow, keeping Saturday on the slightly warmer than normal side. By late Saturday, the aforementioned trough will move inland and over our area as a closed upper low, returning chances of showers/thunderstorms and gusty winds. This low passage will keep Sunday cooler with precipitation chances remaining mainly over high terrain areas. A mostly dry longwave trough off the Pacific will keep our area under a southwest flow early next week. As such, Monday through Tuesday see a return of dry conditions and warmer temperatures.

AVIATION /00Z Wednesday through Thursday/

Issued 600 PM MDT TUE SEP 8 2026 VFR with mostly clear skies overnight. Patchy fog in sheltered mountain valleys overnight through Wednesday late morning. Surface winds: Variable less than 10 kt. Winds aloft at 10kft MSL: W-NW 10-20 kt.

KBOI...VFR and mostly clear. Surface winds: NW 5-10 kt, then light and SE under 6 kt after sunset.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.