textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Isolated showers and thunderstorms are expected over the Idaho highlands this afternoon and evening, and again on Thursday and Friday near the Idaho-Nevada border.

- Dry this weekend into early next week. - Steady warming trend throughout the week with dry conditions and temperatures near normal on the 4th of July.

SHORT TERM /Through Friday Night/

Issued 232 PM MDT WED JUL 1 2026 An upper level ridge will build into the region over the next several days with a warming trend over the short term. Lingering moisture over southwest Idaho will keep a threat of isolated thunderstorms over the mountains this afternoon and evening. Westerly flow will push the moisture to the east on Thursday and keep a threat of isolated thunderstorms mainly over the southwest ID highlands near the Owyhees and south of the Snake Plain to the NV border. Similar conditions on Friday but slightly warmer temperatures.

LONG TERM /Saturday through Wednesday/

Issued 232 PM MDT WED JUL 1 2026 As a Four Corners ridge continues to build, heat will be the main hazard through the coming week. Guidance has continued to trend upward for max temperatures for July 4th, with valley temperatures now forecast to reach the mid-90s (around 5 degrees above normal). Saturday will be dry area-wide...some could say it will be a welcome change after the inclement weather last 4th of July.

South/southwesterly flow will keep temperatures building into early next week, with the hottest day coming Monday with near triple digit temperatures in the Snake River Plain. This will give way to moderate HeatRisk impacts in the Snake River Plain and lower valleys starting Sunday, with localized areas of major HeatRisk impacts come Monday. Those sensitive to heat should consider taking precautions if planning to be outdoors. Moisture advection in the southwesterly flow will bring a risk of terrain driven showers/thunderstorms each afternoon starting early next week. Temperatures in the 90s will stick around through at least mid-week of next week.

AVIATION /00Z Thursday through Friday/

Issued 604 PM MDT WED JUL 1 2026 VFR. Isolated showers and thunderstorms near the ID/NV border and the ID W-Central mountains this evening, expected to diminish after sunset. Main hazard will be gusty outflows 35-40 kt out of the strongest storms in S-Central ID. Surface winds: W-NW 5-15 kt, becoming light and variable overnight tonight. Winds aloft at 10kft MSL: W-SW 10-20 kt.

KBOI...VFR with mostly clear skies. Surface winds: NW 7-12 kt with gusts to around 18 kt this evening, becoming light and variable tonight after sunset.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.