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 /06Z Saturday through Sunday/

Issued 1157 PM MDT FRI JUL 17 2026 VFR, scattered clouds and haze from wildfire smoke overnight. Dense smoke and MVFR possible in SE OR near KBNO and KBKE. Isolated shower and storm development over Central and S-Central ID Saturday afternoon with gusty winds and locally heavy rainfall. High density altitude due to heat in the afternoon. Surface winds: NW or variable 5-12 kt. Winds aloft at 10kft MSL: S-SW 5-15 kt.

KBOI...VFR with some haze due to wildfire smoke. High density altitude due to heat in the afternoon. Surface winds SE 5-10 kt tonight become NW with gusts up to 20 kt tomorrow.

Sunday Outlook...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: SW-NW 5-15 kt, afternoon gusts 15- 25 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

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