textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Warming trend starts on Wednesday with breezy winds.

- Stronger winds on Thursday. Mountains above 6000 feet will see heavy, wet snow through Saturday night. - Gusty winds are expected over much of the region on Saturday, especially in the Camas Prairie and on ridgetops.

- Near record high temperatures will occur over much of the region next Monday and Tuesday, with valley highs nearing 80F.

SHORT TERM /Through Thursday Night/

Issued 226 PM MDT TUE MAR 10 2026 A strong zonal flow will continue to impact the Pacific Northwest through the short term. The core of the jet will remain to our north, allowing for warmer temperatures while keeping heavier precipitation over e-central Oregon and mountains north of the Snake Plain in Idaho. After a slightly calmer day on Wednesday, rain and snow will increase across the mountains Wednesday night. Snow levels start around mtn valley floors where minor accumulations are expected through Thursday morning. McCall has a ~30% chance of seeing more than an inch of snow through Noon Thursday. By afternoon the warming air mass will raise snow levels to around 6000 feet. The flow aloft will transport deeper moisture into our northern mtns. This will result in 1-1.5" of liquid across the southern Wallowas, and the W-Central Idaho Mtns and eastern Boise Mtns (roughly NE of a Featherville-Lowman-Council line). Accumulation of heavy wet snow will be limited to sites above 6000 feet where totals of 8-12 inches will impact higher passes (Big Creek, Warm Lake, Banner Summit). Winds will increase on Thursday across higher open terrain with gusts in the 35-50 mph range. Lower elevations, including the lower Snake Plain, won't get quite as gusty (25-35 mph). Temperatures are above normal Wednesday and Thursday, more so across southern zones that remain dry through the period.

LONG TERM /Friday through Tuesday/

Issued 226 PM MDT TUE MAR 10 2026 The polar jet will remain over the northern tier of western CONUS through this weekend, keeping us under strong zonal flow aloft. This pattern will bring strong winds to the region on Friday and Saturday, with the Camas Prairie and ridgetops seeing gusts up to 55 mph. Wind advisories and maybe even a high wind warning will be needed across much of the southern zones if this forecast continues through the week. Breezy winds will occur in the Treasure Valley and Upper Weiser Basin, but those areas will likely be the most sheltered from the strongest winds. Heavy moisture will stay to the north, but portions of northern Valley County and Baker County will see valley rain and mountain snow through Saturday. High summits and mountain passes could see moderate accumulations of wet snow, but populated areas below about 6000 feet will see minor accumulations. Light mountain showers will likely continue over the West Central and Boise Mountains through Monday, with dry conditions expected elsewhere. Temperatures will dip down slightly on Saturday and Sunday, but a broad high pressure system will build in beginning early next week. This will bring record high temperatures to the region, with the Upper Treasure and Magic Valley seeing highs in the 70s, potentially near 80F (25-40% chance), next Tuesday.

AVIATION /06Z Wednesday through Thursday/

Issued 1123 PM MDT TUE MAR 10 2026 Mid-high level ceilings and VFR overnight. Snow/rain showers return Wed morning at KBKE-KMYL and continue through the day. Snow levels start at valley floors and rise to 5-6 kft MSL by the evening causing snow showers to transition to a snow/rain mix. Surface winds: Variable 5-10 kt. Winds aloft at 10kft MSL: W 25-35 kt.

KBOI...VFR with mid-high level ceilings. Surface winds: SE 5-10 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.