textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Scattered light rain showers in northern areas this evening, then a better chance of light rain Monday night. Mostly cloudy but dry in southern areas through Monday night.

- Continued above normal temperatures through the week with Wednesday the warmest day. Record high temperatures possible Wednesday through Saturday.

- Cooler and wetter Sunday and beyond.

SHORT TERM /Through Tuesday Night/

Issued 200 PM MST SUN NOV 8 2026 A weak upper trough will bring scattered light rain showers to northern mountains tonight. A stronger Pacific trough will bring a better chance of light rain Monday night, again to northern areas. Total precipitation should stay less than .10 inch. Southern areas will be mostly cloudy but dry. Temperatures will lower slightly as the two troughs move through. Light winds through Tuesday mainly from the east through south, increasing Tuesday night.

LONG TERM /Wednesday through Sunday/

Issued 200 PM MST SUN NOV 8 2026 High pressure will peak over the region on Wednesday, with temperatures reaching about 10-15 degrees above normal and near daily record highs. Warm and dry conditions will continue through early Saturday, with little change day to day from Wednesday through Friday. High pressure will shift east by late Friday as southwest flow takes over ahead of a shift to cooler and wetter weather. An atmospheric river will impact the Pacific Northwest on Friday and into the weekend, with the upper level trough eventually moving east and bringing remnant moisture into southeast Oregon and southwest Idaho. Models diverge on when the trough will move into the region, however all favor a cool and wet pattern for Sunday into early next week. This system will also bring breezy southerly winds and a steady cooling trend beginning Sunday. Precipitation chances increase to 20-40% chance on Saturday in high terrain in northeast Oregon and the West Central Mountains in Idaho. Valley locations look to stay mostly dry through Saturday evening. Precipitation chances increase area wide by Sunday, with a 20-40% chance in valleys, and 40-60% in higher elevations north and west of the Snake River Valley. Warm southwest flow ahead of the trough passage will likely keep snow levels above 6500-7500 ft until they drop with the colder air mass moving into the region early next week.

AVIATION /00Z Monday through Tuesday/

Issued 444 PM MST SUN NOV 8 2026 VFR. Mid to high clouds as a weak front moves across the north. Isolated showers north of a KBKE-KMYL line. Patchy fog in western Magic Valley and sheltered valleys early tomorrow morning, mixing out by late morning. Surface winds: mostly variable less than 10 kt this evening through overnight. Winds aloft at 10kft MSL: SW 15-30 kt.

KBOI...VFR. Surface winds: variable less than 8 kt this evening through overnight.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.