textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Showers/thunderstorms across south-central Idaho and the central Idaho mountains through late evening. Storms will be capable of heavy rainfall, gusty outflow winds and small hail.

- Drier this weekend with areas of smoke across southeast Oregon, expanding into southwest Idaho this weekend and into next week.

- Hot temperatures through next week, with valley highs in the upper 90s to around 100 degrees.

- Showers/thunderstorms increase next week with heavy rainfall possible.

SHORT TERM /Through Sunday Night/

Issued 306 PM MDT FRI JUL 17 2026 Thunderstorms over w-central Idaho this evening will dissipate by sunset. The storms will bring heavy rain, with gusty winds and small hail possible. With dew points 50s to low 60s gusty winds have been harder to come by from thunderstorms. The weekend will see drier conditions develop as the deeper moisture shifts east of the region. Outside of isolated high terrain thunderstorms in w-central Idaho, the area will dry out through Sunday. Otherwise it will remain hot and we'll see a increase in smoke coverage due to westerly surface winds.

LONG TERM /Monday through Friday/

Issued 306 PM MDT FRI JUL 17 2026 After the drier weekend, another surge of monsoon moisture will arrive early next week across southeast Oregon and southwest Idaho. This will bring a return of air mass driven thunderstorm development. Outside of embedded waves, convection will initiate over higher terrain during the afternoon, dissipating with sunset. The potential for heavy rain and flooding will increase as precipitable water amounts reach 1.25 inches and southern steering flow aloft weakens towards mid-week. Lower elevation temperatures remain in the upper 90s to near 100 through the week. Smoke will likely continue to impact much of the area through next week, especially across SE Oregon.

AVIATION /00Z Saturday through Sunday/

Issued 613 PM MDT FRI JUL 17 2026 Mainly VFR. Scattered/numerous showers and thunderstorms continuing this evening through about 03Z, mainly over south- central/central ID. Localized MVFR/IFR and mountain obscuration in thunderstorms. Outflow gusts to 35 kt possible from storms. High density altitude due to heat through the evening until sundown. Areas of dense smoke in SE Oregon reducing visibility, especially vicinity of KBNO and KBKE. Surface winds outside of storms: SW-NW 5-15 kt this evening, becoming mostly NW or variable 5-12 kt after sunset. Valley gusts up to 25 kt near KBKE and KONO tonight through early morning. Winds aloft at 10kft MSL: S 10-20 kt.

KBOI...Mainly VFR. A 15% chance of thunderstorms within 10 miles of the terminal through around 02Z this evening. Thunderstorms capable of outflow gusts to 30 kt and brief heavy rain. High density altitude due to heat through sundown. W-NW surface winds with smoke/haze from SE Oregon increasing Saturday.

Weekend Outlook...Isolated showers/thunderstorms over south- central ID and the central ID mtns Saturday afternoon. Mountain obscuration from storms. High density altitude due to heat. Areas of smoke reducing visibility mostly across SE Oregon and near the OR/ID border in SW Idaho. Surface winds outside of storms: SW-NW 5-15 kt, afternoon gusts 15-25 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...OR...Air Quality Alert until noon PDT Monday for ORZ061-062.