textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Warmer and decreased wind today with temperatures rising to near normal.

- Temperatures warming to around 5-10 degrees above normal by mid week.

- Breezy Wednesday and Thursday with shower and thunderstorm potential across the north.

SHORT TERM /Through Wednesday Night/

Issued 339 AM MDT MON JUN 1 2026 A weak upper trough will move across the area today as an upper low slowly shifts north through Montana. Isolated showers will develop along the Nevada border and central Idaho mountains with dry conditions elsewhere. Clouds will linger across the north, closer to the low center, with mostly to partly clear skies elsewhere. Temperatures will be around 5 degrees warmer with highs near normal. Winds will be lighter than yesterday, although it will remain breezy east of Boise with afternoon gusts 15-25 mph.

An upper ridge will move overhead on Tuesday, increasing temperatures by around 5 more degrees. An upper trough will approach the area on Wednesday and move through Wednesday night. Southwest flow ahead of the trough will push temperatures to around 10 degrees above normal. The center of the trough will move across our northern areas, bringing a 20-50% chance of showers and thunderstorms to east-central Oregon and west- central Idaho Wednesday night. Precipitation chances remain below 20% across southern areas. Winds will become breezy Wednesday night as the trough pushes a weak cold front through our area.

LONG TERM /Thursday through Monday/

Issued 339 AM MDT MON JUN 1 2026 An upper trough will exit the forecast area on Thursday, but cooler temperatures and breezy daytime winds are expected in its wake. Showers/thunderstorms will also diminish for most of the area except for lingering chances across central Idaho through the afternoon. Rapid warming will take hold Friday as southwest flow develops aloft ahead of the next Pacific trough. Winds will remain breezy as the accompanying cold front approaches the area. Latest model runs depict the cold frontal passage on Saturday for E Oregon and SW Idaho, increasing shower/thunderstorm chances (15-30%) across northeast Oregon and the central Idaho mountains over the weekend. Temperatures will cool several degrees for Saturday, but further cooling is anticipated Sunday as the trough moves overhead. Gusty winds will persist Sunday from the traversing trough, but should decrease by Sunday night. Drier and warmer conditions are likely to return Monday as the trough weakens and departs toward the east.

AVIATION /12Z Monday through Tuesday/

Issued 507 AM MDT MON JUN 1 2026

VFR and high clouds. Cumulus buildups and isolated showers over west-central Idaho this afternoon. Surface winds: variable 10 kt or less this morning, then W to NW 5-15 kt this afternoon. Gusts around 20 kt from KBOI to KJER/KTWF. Winds aloft at 10kft MSL: westerly 5-15 kt.

KBOI...VFR and high clouds. Surface winds: variable 6 kt or less, then NW 6-12 kt with occasional gusts to 15-20 kt this afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.