textproduct: Boise

KEY MESSAGES

- Dry with temperatures 10 to 20 degrees above normal through next week.

- Today and tomorrow are expected to be the warmest days with record or near record highs.

- A minor disturbance on Monday will bring a low chance of showers and thunderstorms with gusty outflow winds along the Idaho/Nevada border.

- Cooler with a chance of showers starting next weekend.

SHORT TERM /Through Tuesday Night/

High pressure will continue to build over the region today, with a shortwave trough moving in from the southwest tomorrow. Unseasonably warm temperatures will continue with record highs likely across many locations in the region today, tomorrow, and Tuesday. Haze and localized fog/smoke will occur near prescribed burns, primarily near McCall, ID and Burns, OR tonight. The weak shortwave trough will bring increasing high cloud cover and a 5-15% chance of showers and thunderstorms near the Nevada border, with gusty outflow winds up to 35 mph in any of the stronger showers or thunderstorms that form. Light, terrain driven winds will occur outside of outflow gusts. Warm and dry conditions will continue through Tuesday.

LONG TERM /Wednesday through Sunday/

The upper-level ridging over the area will continue through Thursday, with highs 10 to 20 degrees above normal. This pattern will support mostly clear skies and light winds. On Friday, an upper level trough will approach the Pacific Northwest. This system will start impacting the area first by increasing winds over the higher terrain Friday afternoon, with gusts 20 to 30 mph expected. Temperatures will remain warm Friday afternoon ahead of a cold front moving NW to SE across the area starting early Saturday. This cold front will cool temperatures by about 15 degrees when comparing Friday afternoon high temperatures to Saturday. Confidence on the evolution of the trough decreases by Sunday, but additional cooling is likely as the trough moves overhead at some point during the weekend. Precipitation chances look to be highest in the high terrain of SW Idaho (20-40% chance) Saturday and Sunday with a 10-20% chance elsewhere. Winds will also remain breezy over the weekend.

AVIATION /18Z Sunday through Monday/

Issued 1120 AM MDT SUN OCT 4 2026

VFR. Increasing high clouds tonight. Areas of smoke and haze may reduce visibility near prescribed burns. Surface winds: variable less than 12 kt. Winds aloft at 10kft MSL: SW-W 5-15 kt.

KBOI...VFR. Surface winds: variable less than 10 kt through mid afternoon, becoming NW around 5 kt late afternoon through early evening.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.