textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Above normal temperatures continuing through next week.

- Tuesday is the hottest day and will be accompanied by gusty winds and very dry conditions.

- A chance of showers and thunderstorms returns to the area next Friday.

SHORT TERM /Through Tuesday Night/

Issued 306 AM MDT SUN JUN 14 2026 An upper level ridge building along the coast will keep the region under a dry northwest flow through Monday night. A weak upper wave embedded in the flow will bring some passing clouds across southeast Oregon and southwest Idaho late Monday into Monday night. However, stable conditions aloft will cap any chance for precipitation, ensuring dry weather persists. Temperatures will trend warmer through Monday, with afternoon highs climbing a few degrees above seasonal normals. Winds will follow typical diurnal patterns, becoming light and variable overnight.

By Tuesday, the upper ridge axis moves closer to the region, making it the warmest day of the week. Valley locations are expected to reach into the mid to upper 90s. At the same time, a Canadian trough passing to our north will begin to flatten the ridge and tighten the surface pressure gradient. This setup will generate strong and gusty winds starting Tuesday afternoon and continuing through Tuesday night. The combination of hot temperatures, low relative humidity, and increasing winds will bring elevated to critical fire weather conditions to the BLM lands of southwest Idaho.

LONG TERM /Wednesday through Sunday/

Issued 306 AM MDT SUN JUN 14 2026 A tight pressure gradient remains across southwest Idaho continuing the stronger winds on Wednesday. Gusty winds combined with very low humidity will maintain critical fire weather conditions across the BLM lands of southwest Idaho through Wednesday evening. As the trough exits, the ridge opens back up by Friday. This will allow temperatures to climb back into the low to mid 90s in the lower valleys. A weak low moving in from the south late Friday evening may bring enough moisture for a slight chance of thunderstorms along the Nevada border Friday night, spreading into central Idaho on Saturday. Zonal flow follows the exiting trough which will bring cooler temperatures for the weekend though they will still remain about 8 degrees above normal.

AVIATION /12Z Sunday through Monday/

Issued 606 AM MDT SUN JUN 14 2026 VFR with clear skies through this afternoon. Surface winds: SE 5-15 kt this morning, then W-NW 5-15 kt in the afternoon. KBOI...VFR with clear skies. Surface winds: S-SE 5-10 kt, then NW 8-12 kt with gusts up to 20 kt in the afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.