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

- Mostly cloudy and slightly warmer Sunday and Monday, the mostly clear but continued warming through the week.

- A slight chance of showers and afternoon thunderstorms in southeast Oregon and central Idaho on Sunday.

SHORT TERM /Through Monday Night/

Issued 218 PM MDT SAT SEP 26 2026 Yesterday's cold front moved rapidly eastward across our CWA but got only as far south as northern Nevada where it has become stationary. From there the frontal zone will now move slowly northward again as a diffuse warm front tonight through Sunday under southwesterly flow aloft ahead of the next incoming Pacific upper trough. Middle and high clouds will increase from south to north tonight and lead to a 10-20 percent chance of showers on Sunday. There will also be just enough instability for a slight (10%) chance of thunderstorms in the central Idaho mountains Sunday afternoon and early evening. The incoming upper trough will become a closed low in Nevada by Monday and take the frontal zone back out of our area, resulting in clearing skies in Oregon Monday and in Idaho Monday night. Gradual warming is expected through Tuesday, due to clouds and the warm front tonight and Sunday, and the departure of the cool upper low into Nevada on Monday. No significant winds through the period.

LONG TERM /Tuesday through Saturday/

Issued 218 PM MDT SAT SEP 26 2026 High pressure will remain aloft Tuesday through late week, continuing a warming trend with dry conditions area-wide. Temperatures will mainly hover near-normal on Tuesday, before gradually climbing 5 to 10 degrees above normal Wednesday through Thursday. Late Thursday through Friday, long-range guidances hint at a shortwave trough digging across the region. There is considerable guidance uncertainty over its timing and behavior as it passes our area. For now, a cooling trend and mostly dry conditions are expected Friday through Saturday.

AVIATION /00Z Sunday through Monday/

Issued 523 PM MDT SAT SEP 26 2026

VFR with BKN-OVC high cloud coverage overnight into Sunday. Surface winds: variable under 10 kts overnight. Winds aloft at 10kft MSL: SW 10-25 kt.

KBOI...VFR. Surface winds: variable under 10 kts overnight.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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