textproduct: Boise

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Windy conditions this afternoon with northerly winds.

- Isolated afternoon/evening showers and thunderstorms today over the mountains of S Idaho and SE Oregon, otherwise dry.

- Above normal temperatures continue with 10-15 degrees above normal by next week.

SHORT TERM /Through Thursday Night/

Issued 406 AM MDT TUE MAY 5 2026 Northerly flow will continue over the area as a trough remains over southern CA, with cool air east of the Rockies and a ridge over SW British Columbia. Air flow will converge over the central ID mountains and Magic Valley, as air from eastern OR converges with air from eastern ID and MT moving down the Snake Basin. This convergence zone favors isolated showers and thunderstorms Tuesday afternoon. Elsewhere windy northerly conditions expected Tuesday afternoon with gusts of 30 to 40 mph. Northwest flow continues into Thursday with dry and breezy conditions during the afternoon. Temperatures range around 5 to 10 degrees above normal in the short term.

LONG TERM /Friday through Tuesday/

Issued 406 AM MDT TUE MAY 5 2026 A dry cold front will move through the area on Friday afternoon, bringing breezy conditions and lowering temperatures to near normal. Then the upper level ridge redevelops over the western US, with the warmest temperatures of the season by next Monday and Tuesday. Temperatures rise 15 to 20 degrees above normal with highs of 85 to 90 degrees in the Snake Basin.

AVIATION /18Z Tuesday through Wednesday/

Issued 1034 AM MDT TUE MAY 5 2026 VFR. Areas of smoke. Isolated showers/thunderstorms across the higher terrain of southeast Oregon and central ID mountains this afternoon and evening. 30% chance of thunderstorms affecting KTWF/KJER between 05/22Z and 06/02Z. Gusty erratic outflow winds possible with the stronger storms. Surface winds: W-NW 15-25 kt with gusts up to 35 kt through the evening. Becoming light and variable overnight. Winds aloft at 10k ft MSL: N 15-30 kt.

KBOI...VFR. Cumulus buildups east of terminal this afternoon. Surface winds: NW 15-20 kt with gusts around 30 kt this afternoon. Becoming SE 10-20kt after 06/08Z.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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