textproduct: Boise

KEY MESSAGES

- Gusty winds and very dry conditions the rest of today.

- A chance of showers and thunderstorms Friday night through Saturday. Storms Friday night and Saturday morning could produce strong outflow winds, but storms later Saturday may bring heavy rain, especially over higher terrain in Idaho.

SHORT TERM /Through Friday Night/

Today has been breezy and about 10 degrees cooler than yesterday behind a weak dry cold front that passed through last night. Winds will die down this evening and lows overnight should about 10 degrees cooler than last night. Thursday will be much like today but high clouds will spread over southeast Oregon Thursday afternoon as an upper trough gradually takes shape off the California coast. More moisture will spread into southeast Oregon from the California Sierra Nevada Friday as the upper trough becomes better defined. A 20-40 percent chance of thunderstorms will reach southern Harney County Friday afternoon, then expand eastward along the NV/ID border Friday night.

LONG TERM /Saturday through Wednesday/

Guidance continues to favor a short wave trough digging across our area on Saturday, bringing a mix of wet and dry thunderstorms and increasing the threat for heavy rain and flash flooding on burn scars. The best chance for thunderstorms (30 to 60%) will be over the higher terrain of southwest/west-central Idaho. With precipitable water approaching the 80th to 90th percentile, the strongest storms could produce heavy rain in addition to small hail and gusty winds. Burn scars, like the Wapiti Burn Scar over the central ID mountains, will need to be monitored for flash flood potential.

The aforementioned system will bring a slight cooling trend over the weekend, dropping high temperatures back down to seasonal normals. A ridge of high pressure will build back over the region early next week leading to a return of dry conditions and a steady warming trend through midweek. Tuesday and Wednesday will potentially see temperatures 10 to 20 degrees above normal.

AVIATION /18Z Wednesday through Thursday/

Issued 1108 AM MDT WED JUN 17 2026 VFR with clear skies. Surface winds: W-NW 10-20 kt, gusts 25-35 kt from KMUO to KTWF/KJER, and also near KBKE this afternoon. Winds generally lowering to 5-15 kt tonight after sunset. Winds aloft at 10kft MSL: NW 25-40 kt.

KBOI...VFR with clear skies. Surface winds: NW 10-20 kt with gusts up to 25 kt this afternoon, lowering to 7-12 kt after sunset.

FIRE WEATHER

The Red Flag Warning for gusty wind and low humidity for Fire zones 424 (Western Twin FaLLs BLM) and 426 Southern Highlands) will continue as originally issued until 9 PM MDT this evening. Westerly gusts as high as 45 mph and RH as low as 10 percent will create critical fire weather conditions. Wind will decrease later this evening and stay light through Thursday, along with gradually increasing humidity.