textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Strong thunderstorms capable of wind gusts to 60 mph, blowing dust, small hail, and brief heavy rain possible today, with the highest potential across southeast Oregon and west-central Idaho mountains.

- Breezy east-southeast winds today with gusts 30 to 40 mph across southeast Oregon and Idaho south of Boise.

- Additional showers and thunderstorms and periods of gusty winds Thursday through Sunday.

- Thunderstorms may produce gusty winds 40-60 mph and blowing dust, heavy rain, and hail through the week.

SHORT TERM /Through Friday Night/

Issued 237 PM MDT WED MAY 27 2026 Active weather will continue through the end of the week as a closed upper low over the western Great Basin brings rounds of showers and thunderstorms to our area. Scattered thunderstorms are forming over the central ID mountains and southeast OR along the NV border this afternoon. Thunderstorms this afternoon are capable of wind gusts to 60 mph, blowing dust, small hail, and brief heavy rain as the primary hazards. The highest chance for thunderstorms (30-50%) will be across southeast Oregon and the west central ID mountains. Conditions should improve after sunset.

Conditions Thursday will be similar to today as the low remains nearly stationary. Strong thunderstorms will once again be possible, with the highest potential remaining across southeast Oregon and west-central Idaho. Temperatures will be similar with breezy southerly winds gusting to 20-35 mph. On Friday, the upper low will start to lift north as an upper trough approaches the Pacific Northwest. Showers and thunderstorms will increase across the area as the low approaches with localized heavy rain possible from storms. Temperatures will cool by 5-10 degrees, and winds outside of thunderstorms will not be as breezy as previous days.

LONG TERM /Saturday through Wednesday/

Issued 237 PM MDT WED MAY 27 2026 The upper low sitting over the Great Basin will merge with an incoming Pacific longwave trough on Saturday. This merged system will steer northeastward and continue showers/thunderstorms mainly over higher terrain areas of southwest/west-central ID on Saturday. Uncertainty remains over the track and strength of another shortwave trough arriving to the area on Sunday. For now, will maintain a 20-40% chance of showers/ thunderstorms over the higher terrain in SW Idaho. A drying trend will set in Monday through Wednesday of next week, as a ridge builds in over the northwest region. Temperatures will trend upward throughout the long-term period, reaching near normal come Sunday before increasing to 10-15 degrees above normal come Wednesday.

AVIATION /06Z Thursday through Friday/

Issued 1154 PM MDT WED MAY 27 2026

Generally VFR. Scattered showers and thunderstorms tonight through Thurs/06Z and again tomorrow after Thurs/20Z, with outflow gusts up to 55 kt, brief heavy rain, and hail in the strongest storms. Precipitation ending overnight, except for a 30% chance of overnight showers and thunderstorms near KBNO. Surface winds outside of storms: NW-SE 10-25 kt with gusts to 30 kt this evening, tapering off to variable less than 10 kt overnight. Winds aloft at 10kft MSL: E-SE 20-35 kt.

KBOI...VFR. Isolated showers with a 30% chance of thunder tomorrow afternoon. Storms capable of outflows of 40-50 kt, small hail, and brief heavy rain. Surface winds outside of storms: S-SE 10-15 kt with gusts 20-25 kt, variable less than 6 kt overnight, then SE 10-20 kt with gusts to 30 kt by late morning.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.