textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Weak Pacific cold front will bring isolated thunderstorms to the area Saturday afternoon and evening.

- Gusty outflow winds up to 50 mph possible from thunderstorms.

- Dry and slightly cooler conditions Sunday.

SHORT TERM /Through Monday Night/

Issued 415 AM MDT SAT AUG 22 2026 A cold front will slowly move across central OR today into southwest ID this evening. Showers and thunderstorms expected ahead of the cold front, mainly across southwest ID and far eastern OR. The best dynamics for thunderstorms today will be generally be east of a line from Baker City OR to Jordan Valley OR, with enough effective bulk shear for organized thunderstorm development. Shower and thunderstorm threat continues into the late evening into early Sunday morning before drier air moves in by late Sunday morning. Slightly cooler temperatures expected on Sunday with dry conditions. Isolated thunderstorms possible along the NV border south of Twin Falls Sunday afternoon. A weak shortwave embedded in the southwest flow aloft will bring increased clouds on Monday with slightly cooler temperatures. Isolated showers and thunderstorms will generally be confined to the higher terrain of southwest ID Monday afternoon. Gusty outflow winds up to 50 mph possible with thunderstorms each day.

LONG TERM /Tuesday through Saturday/

Issued 415 AM MDT SAT AUG 22 2026 A trough off the Pac NW coast pushes the monsoon moisture east on Tuesday with drier air, breezy conditions and slightly cooler temperatures Tuesday through Friday. Temperatures will around 2-5 degrees above normal through the period.

AVIATION /12Z Saturday through Sunday/

Issued 632 AM MDT SAT AUG 22 2026 VFR. Areas of wildfire smoke. Scattered thunderstorms east of KBKE to K10U, with 30-50 kt outflows and locally heavy rain, blowing dust with vis restrictions. High density altitude from heat. Surface winds outside of storms: VRB 5-15 kt. Winds aloft at 10kft MSL: S 10-20 kt.

KBOI...VFR. A 20% chance of showers/thunderstorms this aft and evening. Erratic outflows to 30-45 kt and BLDU possible. Surface winds: NW 5-10kt during the afternoon, SE 5-15 kt in the evening.

Sunday Outlook...Generally VFR. Areas of wildfire smoke. Shower and thunderstorm activity in southwest/central Idaho diminishing early Sunday AM. Isolated storms returning near KTWF in the afternoon. Surface winds: SW-NW 5-15 kt with afternoon gusts 15-25 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Red Flag Warning from noon today to midnight MDT tonight for IDZ401>403-421-424-426. OR... Red Flag Warning from 11 AM this morning to 8 PM PDT this evening for ORZ670>672.