textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Scattered thunderstorms in southern areas Monday afternoon and early evening.

- Little chance of thunderstorms the rest of the week, except a slight chance in the central ID mountains Wednesday afternoon, and near the NV/ID border Friday-Sunday afternoons.

- Warming Monday and Tuesday, holding level Wednesday, then gradually cooling the rest of the week.

SHORT TERM /Through Wednesday Night/

Issued 214 PM MDT SUN AUG 23 2026 Thunderstorm threat shifting out of Twin Falls County late today then dry through the night. Mid-high level moisture will increase from the southwest overnight and Monday morning with scattered thunderstorms developing by noon in Twin Falls County, early afternoon in Owyhee County, and mid afternoon in southeast Oregon, lasting until sunset. Clouds will increase but storms should stay south of the Snake River in ID, and south of Burns- Ontario in OR. Monday will also be 4 to 8 degrees warmer than today even with increasing clouds, as a short wave ridge aloft comes in from northern California. The ridge and thunderstorms will exit Monday night but further slight warming will continue Tuesday, with high temps reaching the mid-upper 90s in the Snake Basin and 85 to 95 elsewhere.

&&

LONG TERM /Thursday through Monday/

Issued 214 PM MDT SUN AUG 23 2026 Generally dry and breezy conditions will persist throughout much of the long-term period. Lingering moisture will allow for a 15-30% chance of precipitation and a 15-20% chance of thunderstorms Wednesday afternoon, mainly near the ID/NV border and the Central ID Mountains. Beyond Wednesday, troughing off of the west coast will push the moisture south and east of our area. Height falls throughout the period will allow for a slight cooling trend, with temperatures 2-7 degrees above normal throughout the period. Uncertainty begins to increase late this week, following the lifting of the initial trough and associated frontal passage. However, cluster analysis is leaning towards troughing digging back down into the weekend.

AVIATION /06Z Monday through Tuesday/

Issued 1246 AM MDT MON AUG 24 2026 VFR. Areas of wildfire smoke. Surface winds: variable under 12 kts overnight. Winds aloft at 10kft MSL: SW 5-20 kt.

KBOI...VFR. Surface winds: light and variable overnight.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Fire Weather Watch from noon MDT today through this evening for IDZ423-426. OR...Fire Weather Watch from Monday afternoon through Monday evening for ORZ670>672.