textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Cooler than normal temperatures, 10 to 15 degrees below normal through Monday.

- Unsettled conditions through Tuesday, mainly on the Idaho side.

- Snow levels near 6000-7000 feet in the west central ID mountains through Monday with light accumulations, higher levels to the south and east.

- Warm and dry conditions Wednesday through next weekend.

SHORT TERM /Through Monday Night/

Issued 240 PM MDT SAT OCT 10 2026 slowly move south into northern CA by Sunday with a long stream of moisture connected to the remnants of what was Rachel. Most of the moisture will stay east of our area though, with cooler temperatures and breezy conditions as the main impact. Precipitation over eastern OR will generally be limited with this system, with the best chance and heaviest precipitation coming over the Boise Mountains, and eastern Magic Valley through Sunday. Precipitation amounts of 0.5 to 1.0 possible generally from Twin Falls and areas east, with up to 0.25 possible over the rest of SW Idaho. Snow levels fall to 5000 to 6000 feet in eastern OR, and north of McCall ID, but precipitation will be limited. Snow levels in ID will be much higher in the warm sector of the system, with 7000 to 8000 feet over the central ID mountains. The trough will remain nearly stationary through Monday keeping a threat of showers mainly over the Idaho side.

LONG TERM /Tuesday through Saturday/

Issued 240 PM MDT SAT OCT 10 2026 drying trend will set in come Tuesday as the low exits to the east. Our far eastern zones may end up on the periphery of the wrap around precipitation associated with the low, leading to a 20-40% chance of precipitation Tuesday morning; generally south and east of Mountain Home. Tuesday and Wednesday afternoons will remain breezy as the low exits. Beyond Tuesday, a warming trend will set in through the start of the weekend with dry conditions. This is thanks to a ridge that will build in over the West Coast before eventually shifting to be over the Great Basin. Temperatures will start out right around normal Tuesday before increasing to around 5-10 degrees above normal by Friday.

AVIATION /00Z Sunday through Monday/

Issued 540 PM MDT SAT OCT 10 2026

Generally VFR. Isolated showers this evening near ID-NV border, with lightning remaining S-E of KTWF. Precipitation increasing from SE to NW early Sun/AM through Sunday night, mainly east and south of KBNO-KONO-KMYL line. Low VFR to MVFR in heavier rain. Mountains becoming obscured, with IFR-LIFR likely in high mtn snow in central ID. Snow levels: 6-9 kft MSL in SW Idaho. Surface winds: W-N 5-15 kt with gusts to 15-25 kt. Winds aloft at 10 kft MSL: SW-W 10-25 kt, then variable 5-15 kt by Sun/15Z.

KBOI...VFR. A 30% chance of light rain tonight, and again Sunday late afternoon. Surface winds: NW 6-14 kt through the period, with gusts to around 20 kt before sunset. Then, gusts returning after Sun/17Z.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.