textproduct: Boise

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Dry, breezy afternoons and warm through Tuesday.

- Temperatures 10 to 15 degrees above normal through Tuesday. - Showers and thunderstorms, windy, and much cooler Wednesday and Thursday as a cool upper level trough moves through.

SHORT TERM /Through Tuesday Night/

Issued 242 PM MDT SUN APR 19 2026 A ridge of high pressure will continue to build into the area with a warming trend through Monday. Temperatures will warm an additional 5 degrees on Monday and be steady through Tuesday ahead of the next cold front. Breezy south to southeast winds expected during the afternoons ahead of the cold front. The cold front arrives late Tuesday night into early Wednesday morning with showers becoming widespread. A slight chance of thunderstorms possible along the cold front on Tuesday evening.

LONG TERM /Wednesday through Sunday/

Issued 242 PM MDT SUN APR 19 2026 A moisture-rich (50th-75th percentile PW) 500 mb closed low will move overhead Wednesday. This feature will bring thunderstorm chances (15-20%), widespread precipitation chances (70-90%), and gusty winds (25-40 mph, highest in the Western Magic Valley) on Wednesday. Snow levels Wednesday and Thursday will range from 5000-6500 ft MSL. As a result, several inches of snow accumulation will develop across the higher terrain once ground temps cool, while moderate rainfall totals can be anticipated for low/mid elevations. Numerous showers will remain through Thursday as the trough moves east. Winds will gradually subside for Thursday, but remain breezy throughout the afternoon. Cooler temperatures are also expected to persist from the cold frontal passage late Tuesday/early Wednesday. Temperatures are expected to be 10-15 degrees below normal Wednesday, 5-10 degrees below Thursday, and near normal by Friday onwards.

As the center of the low departs further towards the east, cool northerly flow will persist through the weekend. Unsettled conditions are expected to continue, as troughing persists across the Northwest U.S.

AVIATION /00Z Monday through Tuesday/

Issued 538 PM MDT SUN APR 19 2026 VFR. Surface winds: E-S 5-15 kt with gusts to 15-25 kt this afternoon. Winds aloft at 10kft MSL: S 10-20 kt.

KBOI...VFR. Surface winds: SE 5-12 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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