textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Cold morning temperatures this morning will bring patchy frost and near-freezing conditions, with Frost Advisories in effect for the Snake Plain and a Freeze Warning in effect for the Magic Valley through late morning today.

- Warm and dry conditions Wednesday through the weekend. Temperatures reaching up to 15 degrees above normal on Friday.

- Possible active pattern bringing cooler conditions and precipitation chances early next week.

SHORT TERM /Through Friday Night/

Issued 319 AM MDT WED OCT 14 2026 dry northerly flow aloft ahead of a large Pacific high pressure moving in, continuing colder morning temperatures today (Wednesday). Valley temperatures will drop into the lower to mid 30s this morning, favoring patchy to widespread frost development. As such, Frost Advisories remain in place for all Snake Plain valley areas this morning. A colder pool over south- central ID will warrant a Freeze Warning for the Magic Valley through the late morning today. Later today, the aforementioned Pacific high will quickly build into the area, bringing elevated daytime temperatures a few degrees warmer than yesterday's. Thursday through Friday will see daytime temperatures 5 to 10 degrees above normal as the ridge further centers over the northwest region through late week. Friday will potentially see peak temperatures up to 15 degrees above normal. Clearing skies and radiational nighttime cooling will favor the development of morning frosts and patchy fog, especially in sheltered valley areas, each morning through Friday.

LONG TERM /Saturday through Wednesday/

Issued 319 AM MDT WED OCT 14 2026 will continue warmer than normal temperatures, potentially 10 to 15 degrees above normal, on Saturday. A northwest shortwave and associated dry cold front on Sunday will help drop temperatures a few degrees, but will still be 5 to 10 degrees above normal. On Sunday, our area will come under a strong southwest flow ahead of an incoming Pacific upper low from the Gulf of Alaska. This flow will keep Monday slightly warmer than normal but with increasing high clouds from the west. Tuesday through Wednesday, there is considerable guidance uncertainty over the upper low's movement pattern as it nears our area. For now, Tuesday through Wednesday will potentially see cooler than normal temperatures and precipitation chances over most of the area.

AVIATION /18Z Wednesday through Thursday/

Issued 1158 AM MDT WED OCT 14 2026 VFR with mostly clear skies. Patchy valley fog in Central ID Mountains and the OR Blue Mountains Thursday morning through sunrise. Surface winds: NW 5-15 kt late through late afternoon becoming variable 5-10 kt tonight. Winds aloft at 10kft MSL: N-NE 10-25 kt.

KBOI...VFR under clear skies. Surface winds: NW 7-12 kt becoming variable under 8 kt late this evening. Gusts up to 20 kt in the afternoon/evening.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.