textproduct: Boise

KEY MESSAGES

- Hot weather will continue through Monday followed by slight cooling midweek, then trending hotter again beginning Friday, becoming extremely hot next weekend.

- Isolated thunderstorms over higher terrain in eastern Oregon Sunday afternoon and night, spreading into western Idaho Monday, then ending west to east Tuesday. - Breezy winds each afternoon.

SHORT TERM /Through Monday Night/

Hot weather will peak Sunday and Monday as westerly flow aloft backs to southwesterly. The increasing southerly component will gradually draw mid-level moisture northward into our CWA, resulting in isolated thunderstorms Sunday afternoon in Harney County, then over the rest of eastern Oregon Sunday night through Monday night. A slight chance of thunderstorms will develop in western Idaho Monday afternoon and Monday night. Due to low-level dryness, lightning and gusty outflow winds to 50 mph will be the primary thunderstorm threats. Outside of thunderstorms, expect breezy conditions in eastern Oregon this evening with gusts 20-35 mph, with similar gusts Sunday afternoon but in Idaho as well.

LONG TERM /Tuesday through Saturday/

A ridge will remain over the Four Corners region with continued hot temperatures and southwest flow over the area. Residual monsoon moisture continues into Tuesday with a chance of thunderstorms as a shortwave moves across the Pacific NW. Westerly flow shunts the moisture to the east on Wednesday and Thursday with dry and breezy conditions and slightly cooler temperatures. Temperatures Tuesday and Wednesday around 5-10 degrees above normal cooling to near normal on Thursday. The ridge expands over the area on Friday bringing hotter temperatures for next weekend.

AVIATION /18Z Saturday through Sunday/

Issued 1211 PM MDT SAT JUL 4 2026 VFR. High density altitude in the afternoon/evening due to heat. Surface winds: variable 10 kt or less, becoming SW-NW 5-15 kt in the afternoon. NW gusts 15-25 kt KBKE to KONO this evening. Winds aloft at 10kft MSL: SW 10-20 kt.

KBOI...VFR under clear skies. Surface winds: SE 5-10 kt, then NW 7-12 kt in the afternoon, becoming variable less than 10 kt overnight.

Sunday Outlook...Mainly VFR. Isolated thunderstorms over SE Oregon, far SW Idaho, and the central Idaho mountains late afternoon and evening. High density altitude in the afternoon and evening due to heat. Gusty outflow winds from showers and thunderstorms up to 50 kt. Surface winds: W-NW 5-15 kt. NW gusts 20-30 kt KBKE to KONO and near KMUO in the evening.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None. OR...None.