904
FXUS65 KBOI 110905
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
305 AM MDT Fri Sep 11 2026

.KEY MESSAGES...

- Warm and mostly dry today and tomorrow ahead of a strong cold
  front late tomorrow night with scattered showers, isolated
  thunderstorms, high elevation snow, and gusty westerly winds.

- Breezy and much cooler Sunday, with lingering showers in
  northeast OR and the central ID mountains.

- Unsettled cool conditions through next Wednesday, then a
  warming and drying trend likely for the end of the week.

&&

.SHORT TERM /Through Sunday Night/...
Breezy westerly winds will linger over higher terrain this
morning as a weak cold front continues tracking east. A short
lived ridge of high pressure will build in later today into
early Saturday, bringing temperatures about 3-5 degrees above
normal for the region. Then, a strong low pressure system will
move into the Pacific Northwest late Saturday with a strong cold
front moving into southeast OR overnight. This front will then
track into southwest ID by early Sunday morning. Southwest
winds with gusts up to 40 mph, scattered showers, isolated
thunderstorms, and much cooler temperatures will accompany this
front. Current model runs track the low pressure and the bulk of
the moisture into northern Idaho, keeping the best chances of
precipitation over northern zones near Baker County, OR and
Valley County, ID. Liquid equivalent precipitation amounts by
Sunday will range from 0.50-0.80 inches, with snow levels
dipping down to 6,500-7,500 feet MSL by Sunday night. Snowfall
accumulations will likely be around 1-2 inches over high
terrain.

&&

.LONG TERM /Monday through Friday/...
Low pressure will gradually move east early next week, but
continued troughing will linger over the region, keeping
temperatures slightly below normal on Monday and Tuesday.
Another weak low pressure system will move in by Wednesday,
bringing a low chance of precipitation over high terrain and
another brief cool down. Model disagreement then increases with
the evolution of that low; however, the majority of solutions
favor ridging returning by late week, with dry conditions and
temperatures 5-10 degrees above normal expected.

&&

.AVIATION /06Z Friday through Saturday/...
Issued 1207 AM MDT FRI SEP 11 2026

VFR. Isolated showers/virga near KMYL and the ID-NV border
through Fri/12Z. Surface winds: SW-NW 5-15 kt. Winds aloft at
10kft MSL: SW-W 25-35 kt.

KBOI...VFR with scattered mid-level clouds. Surface winds:
SE 5-10 kt, then NW-N 4-8 kt after 11/12z.

Weekend Outlook...VFR with increasing SW surface winds in OR
Saturday afternoon. Cold front with gusty southwest winds,
widespread showers, and scattered thunderstorms late Saturday, mainly
in Baker County, OR and north of the Snake Basin in ID. MVFR
conditions and mountain obscuration in precip. Showers, mountain
valley fog, and MVFR conditions continuing Sunday morning in
west-central ID before improving in the afternoon.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Fire Weather Watch from Saturday afternoon through Saturday
     evening for IDZ423-426.
OR...None.

&&

$$

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SHORT TERM...SA
LONG TERM....SA
AVIATION.....SA