textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Showers north and scattered thunderstorms south for the rest of this afternoon, followed by gradual clearing tonight.

- Daytime temperatures remaining near normal through Sunday, then hotter and drier Monday through Wednesday, and remaining hot and dry Thursday.

SHORT TERM /Through Tuesday Night/

Issued 221 PM MDT SAT JUN 20 2026 Today's rain has greatly moistened the lower atmosphere and showers should keep northern areas cool, moist, and stable the rest of today, with partial clearing tonight. Southern areas, however, have partially cleared and rapid destabilization has led to thunderstorm development that will continue the rest of the afternoon, ending early evening in south- central Idaho. The clearing and cooler overnight and mostly sunny Sunday. Continued mostly clear into Monday and 3 to 5 degrees warmer than Sunday.

LONG TERM /Wednesday through Sunday/

Issued 221 PM MDT SAT JUN 20 2026 A ridge of high pressure will continue to build over the West Coast through Thursday, bringing a gradual warming and drying trend through the middle of the week. Hot daytime temperatures will peak on Wednesday, with valleys seeing highs in the upper 90s and near 100F. Higher elevations will see temperatures in the upper 80s. A weak shortwave trough will help cool temperatures down and bring a low chance of mountain showers on Thursday. Conditions will briefly dry out late Thursday into early Friday. Then, a much more impressive closed low pressure system will move into the Pacific Northwest on Friday, bringing widespread precipitation and cooler temperatures through the weekend. Model agreement in the storm track of this low remains high through Friday-early Saturday, but disagreement remains on how long the low will linger over the region into the weekend.

AVIATION /06Z Sunday through Monday/

Issued 1209 AM MDT SUN JUN 21 2026 Possible mountain valley fog/stratus where recent rain occurred. Otherwise, VFR and clearing skies overnight. Isolated thunderstorms developing near ID/NV border Sunday afternoon. Surface winds: variable 12 kt or less. Then, W-N 5-15 kt with gusts to 15-20 kt Sunday afternoon. Winds aloft at 10kft: westerly 10-20 kt.

KBOI...VFR. Clouds clearing overnight. Surface winds: variable or SE up to 10 kt overnight, then W-NW 5-15 kt by late Sun morning.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.