textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Mild and dry today through early Friday. Near record high temperatures.

- Chance of precipitation returns Friday night. Additional rain and mountain snow, along with cooler temperatures, next week.

- Breezy this week into the weekend, with the strongest winds on Friday.

SHORT TERM /Through Friday Night/

Issued 335 AM MST WED NOV 11 2026 An upper level ridge will amplify overhead today, then gradually shift east through Friday as a deep low from the Gulf of Alaska approaches the coast. The ridge and southerly flow aloft will bring temperatures 10-20 degrees above normal, which will be near record highs in many areas each day. This will place lower valley high temperatures in the mid 60s to around 70F. Mild to warm temperatures will further be aided by partly to mostly sunny skies each afternoon and breezy southerly to southeasterly surface winds. Expect gusts 15-25 mph today and Thursday in most areas, increasing further on Friday as the low starts to move onshore. Winds on Friday will be strongest across the open terrain of southeast Oregon and far southwest Idaho with gusts 35-50 mph, and gusts 20-40 mph elsewhere. A cold front associated with the low will move across the area Friday night. The front will be accompanied by a 60-90% chance of precipitation and snow levels falling from 7-8kft MSL to 6-7kft. The system will be quick-hitting and weaken as it moves inland, therefore only light precipitation amounts are expected with most areas picking up 0.10-0.25 inch, but with up to 0.50 inch possible in the mountains. This will translate to a few inches of snow above 7000 feet.

LONG TERM /Saturday through Wednesday/

Issued 335 AM MST WED NOV 11 2026 Precipitation will taper off from the west Saturday morning as a cold front moves east of the area. Highs will cool around 10 degrees from Friday behind the front. Winds will not be as strong as Friday but will still be breezy with gusts 15-30 mph from the west to northwest. An upper level ridge will briefly move overhead late Saturday through most of Sunday as another deep low approaches the coast. Winds will continue to be breezy on Sunday ahead of this next system with temperatures rebounding a few degrees. Similar to the previous system, this system will weaken as it moves inland but bring with it a cold front and precipitation. While ensembles differ on the exact timing, it is expected to move through between Sunday night and early Tuesday, with Monday seeing the highest (50-80%) chance of precipitation. Light to locally moderate precipitation totals are expected. Snow levels will lower from around 6000 feet Sunday night to 4000-5500 feet by the time precipitation ends, allowing for additional mountain snowfall. Temperatures will trend lower with highs cooling to near normal by Tuesday. Winds will continue to weaken as the system progresses but remain locally breezy. On Wednesday, another low from the Gulf of Alaska will approach the coast with precipitation chances increasing late in the day.

AVIATION /12Z Wednesday through Thursday/

Issued 458 AM MST WED NOV 11 2026 Mainly VFR under passing high clouds. Patchy fog/mist this morning in sheltered valleys, including near KONO/KEUL/KMYL/ KBNO. Surface winds: Generally SE-SW 5-15 kt with gusts 15-25 kt this afternoon in portions of E-Oregon and the Snake Plain. Similar conditions expected Thursday. Winds aloft at 10kft MSL: S-SW 10-20 kt.

KBOI...VFR. Surface winds: SE 6-12 kt. Gusts to around 20 kt this afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.