textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- High temperatures about 10 degrees below normal today with rain and snow showers possible in the west-central Idaho mountains. - Widespread showers late Monday night through Tuesday morning, thunderstorms Tuesday afternoon, then more showers Wednesday mainly on northern mountains. - Warming and drying Thursday through Saturday.

SHORT TERM /Through Tuesday Night/

Issued 319 AM MDT SUN JUN 7 2026 At 2 AM MDT a reinforcing cold front could be seen on satellite extending from NW Montana through Grangeville ID, southwestward through Steens Mountain, to Lakeview OR, supported by a short wave trough from the main upper low in northern WA. The cold front will move eastward through our CWA today bringing further cooling and maintaining gusty west/northwest winds through the day. Monday looks mostly sunny and warmer after the upper trough exits east, and ahead of the next north Pacific cold front forecast to arrive Monday night. That system will bring rain to all areas late Monday night through Tuesday morning, heaviest in northern areas where .25 to .75 inch is expected, including up to an inch of snow above 6000 feet MSL. But .10 to .20 inch of rain should also fall on the Snake Basin. Tuesday's system will exit east later in the day, and Tuesday night should be drier.

LONG TERM /Wednesday through Sunday/

Issued 319 AM MDT SUN JUN 7 2026 One last surface cold front and supporting upper trough Wednesday, with showers from that system mainly in the north. A warming and drying trend is forecast Thursday through Saturday with further upper troughs staying north of our CWA, but close enough for occasional cloudiness in northern areas vs mostly clear skies in the south. A stronger upper trough may bring cooling and gusty winds to Idaho on Sunday but not all models agree on that.

AVIATION /12Z Sunday through Monday/

Issued 539 AM MDT SUN JUN 7 2026 Mid-level clouds with ceilings 8-10kft MSL over e-central Oregon and w-central Idaho decreasing this morning. Generally clear this afternoon and early evening then broken-overcast clouds AOA 15 kft MSL spreading eastward across the area. Surface winds: W-NW 10-20 kt with gusts to 30 kt until around 21Z then decreasing. Winds aloft at 10kft: W 15-25 kt, becoming NW after 18Z.

KBOI...VFR. Surface winds NW 12-22 kt through 18Z then decreasing. Generally clear sky until 08/00Z then broken to overcast clouds AOA 15 kft MSL spreading in from the west.

FIRE WEATHER

Red Flag Warning for gusty wind and low humidity this afternoon through sunset (9 PM MDT) for the western Twin Falls BLM and Southern Highlands in south-central Idaho. Conditions improving tonight as winds decrease and humidity increases.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Fire Weather Watch from 1 PM MDT this afternoon through this evening for IDZ424-426. OR...None.