textproduct: Boise

KEY MESSAGES

- Hot temperatures through the week, potentially becoming very hot next weekend.

- Isolated to scattered showers and thunderstorms today through Tuesday mainly over higher terrain, with lightning, gusty outflow winds, brief heavy rain, and small hail possible. - Breezy winds each afternoon.

SHORT TERM /Through Tuesday Night/

Another hot day is in store across our area today as a ridge of high pressure centered to our east strengthens and the flow aloft becomes southerly. Highs in most areas will be a couple degrees warmer than yesterday, with lower elevations reaching the mid to upper 90s and mountain valleys in the 80s to lower 90s. The southerly flow will also bring in mid-level moisture into our area, primarily across southeast Oregon ahead of a shortwave trough lifting north out of western Nevada. Increased moisture and the trough will bring isolated to scattered showers and thunderstorms to southeast Oregon and the Owyhee Mountains of southwest Idaho late this afternoon and evening. Due to limited moisture and dry low-levels, the primary hazards will be lightning and gusty outflow winds to 50 mph. Outside of storms, expect breezy afternoon and evening winds with gusts 20-35 mph.

Isolated to scattered showers with embedded thunderstorms will expand into southwest Idaho Sunday night into Monday morning as the trough moves across our area. Activity will increase in the afternoon across the west-central Idaho mountains near the center of the trough. Enough moisture will linger across the higher terrain of southeast Oregon and far southwest Idaho for additional afternoon/evening showers and thunderstorms. Slightly deeper moisture in place on Monday will allow for brief heavy rainfall and small hail in stronger storms, in addition to lightning and gusty winds. Highs Monday will cool 3-5 degrees behind the trough with continued breezy conditions. On Tuesday, temperatures will rebound under southwesterly flow aloft. Daytime instability will bring a 10-30% chance of showers and thunderstorms to the higher terrain.

LONG TERM /Wednesday through Sunday/

An upper trough moving by to our north will bring westerly flow aloft Wednesday and Thursday. This will push moisture to the east, ending the threat for showers and thunderstorms after Wednesday. Expect breezy conditions with temperatures cooling a few degrees by Thursday. For Friday into the weekend, a ridge over the Four Corners will strengthen and build north while a trough deepens off the coast. Southwest flow will bring increasing temperatures and breezy conditions. Currently, ensembles slightly favor some influence from the trough, moderating temperatures somewhat. However, if the ridge builds further west, very hot temperatures would develop across the area over the weekend, with highs over 100 degrees across lower elevations.

AVIATION /06Z Sunday through Monday/

Issued 1219 AM MDT SUN JUL 5 2026 VFR. Isolated thunderstorms over SE Oregon, far SW Idaho, and the central Idaho mountains Sunday late afternoon and evening. Thunderstorms capable of producing gusty outflows up to 50 kt. High density altitude Sunday afternoon/evening due to heat. Surface winds: SW-NW 5-15 kt this evening. NW valley gusts 15-25 kt from KBKE to KONO this evening. Otherwise, mostly variable under 12 kt overnight through Sunday morning. Winds aloft at 10kft MSL: SW 10-20 kt.

KBOI...VFR under clear skies overnight through morning. High density altitude Sunday afternoon/evening due to heat. Surface winds: SE or variable less than 10 kt overnight through Sunday morning, becoming NW 7-12 kt with gusts up to 20 kt in the afternoon.