textproduct: Boise

KEY MESSAGES

- Continued very warm and dry through Friday.

- Much cooler, with showers possible, Saturday through Tuesday.

SHORT TERM /Through Thursday Night/

An upper level ridge will remain in place through the week, continuing very warm and dry conditions across the area. Conditions will be very similar from day to day. Near record highs are expected, with lower valleys in the low to mid 80s, and mountains in the 70s to low 80s. See the latest Public Information Statement for details. Mostly clear skies and light winds will allow for good radiational cooling at night, with lows in the 40s to lower 50s, except 30s in colder mountain valleys. These values are 5 to 10 degrees above normal for early October.

LONG TERM /Friday through Tuesday/

A major pattern shift is expected during the extended period. Friday will remain warm and dry, but winds will increase in the higher terrain as an upper level trough approaches from British Columbia. A cold front will move across the area on Saturday, cooling high temperatures by 15 to 20 degrees from Friday. Breezy winds will expand to lower elevations as the front moves through.

The trough is favored to close off and dive south through the Pacific Northwest Saturday into Sunday, then may progress further south before turning east early next week. With this scenario, ensembles have consistently developed significant precipitation to the east of the low center where better moisture will exist. This results in a 30-50% chance of precipitation across central Idaho Saturday night through early Tuesday with a 10-30% chance further west. However, models have varied considerably with the evolution and track of the low, so confidence in precipitation amounts are low. Temperatures are expected to dip normal Sunday through Tuesday. Cooler air will also mean lower snow levels, allowing for snow on the higher peaks. However, similar to the precipitation forecast, how much cooler depends on the exact track of the low. Currently, highs are favored to be 5 to 10 degrees below normal with snow levels around 5500-7000 feet. Winds will remain breezy through Sunday, then start to subside early next week.

AVIATION /06Z Tuesday through Wednesday/

Issued 1212 AM MDT TUE OCT 6 2026 VFR. High clouds decreasing tonight. Areas of smoke and haze may reduce visibility near prescribed burns. Isolated showers and thunderstorms early tonight southwest of KTWF. Surface winds: variable less than 12 kt. Winds aloft at 10kft MSL: SW-W 5-15 kt.

KBOI...VFR with high clouds. Surface winds: SE 5-10 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.