textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Rain and high elevation snow decreasing from west to east today. - Cooler with gusty winds today and tonight. Near to slightly above normal temperatures through the week.

- Dry Monday through Wednesday, then a slight chance of precipitation late week.

SHORT TERM /Through Tuesday Night/

Issued 206 PM MST SUN NOV 1 2026 A Pacific cold front exiting east of the region early this evening will leave a strong post-frontal surface pressure gradient across southern Idaho. Gusty westerly winds will remain the primary impact through late this evening, especially along the Interstate 84 corridor from Mountain Home through the Western Magic Valley. In these areas, sustained winds of 20 to 30 mph with peak gusts reaching 45 mph before winds steadily taper off after midnight as the gradient relaxes and surface decoupling occurs.

Behind the front, scattered shower activity over the central Idaho mountains will diminish overnight, giving way to clearing skies. Patchy valley fog may develop early Monday morning in sheltered basins that received wetting rains, particularly across southeast Oregon and west-central Idaho. However, its unlikely fog will develop across the Snake Plain given sustained winds overnight.

A transitory upper-level ridge builds overhead Monday into Monday night, yielding dry conditions and near-normal daytime temperatures. Mid and high clouds increase on Tuesday ahead of the next weak shortwave trough advancing out of the eastern Pacific. Model guidance keeps the bulk of moisture and upper support split north and south of our forecast area, with precipitation chances limited mainly to isolated showers over the higher terrain of the West Central Mountains late Tuesday and Tuesday night. Temperatures through Tuesday night will remain within a few degrees of seasonal normals.

LONG TERM /Wednesday through Sunday/

Issued 206 PM MST SUN NOV 1 2026 The mid week low pressure system will be on the way out Wednesday, resulting in breezy afternoon winds but little to no precipitation. Additional systems will move by to the north on Thursday and Friday, resulting in a 10-30% chance of showers on Thursday and a 20-40% chance on Friday, highest across our northern CWA. Over the weekend, an upper-level ridge is forecast to build with dry conditions returning. The weak systems Wednesday through Friday will bring slight cooling, but temperatures will still be near normal. Slightly warmer temperatures will arrive over the weekend as the ridge builds in.

AVIATION /00Z Monday through Tuesday/

Issued 513 PM MST SUN NOV 1 2026 Mostly VFR, with areas of MVFR stratus continuing over Magic Valley through tonight. Mostly clearing otherwise. Patchy fog in sheltered valleys overnight through Monday morning. Snow levels 6000-8000 ft MSL. Surface winds: W-NW 10-20 kt with gusts 20-35 kt from KBKE through Snake Plain, strongest east of KBOI, lowering down to 10-15 kt with gusts 20-25 kt Monday afternoon. Winds aloft at 10kft MSL: N-NW 20-30 kt.

KBOI...VFR with gradually clearing clouds tonight. Surface winds: NW 10-15 kt with gusts up to 25 kt tonight, lowering down to 5-10 kt Monday early morning.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.