782
FXUS65 KBOI 141216
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
616 AM MDT Mon Sep 14 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Breezy and cool today, with lingering mountain showers in
  northeast OR and central ID.

- Slight warming and drying trend Tuesday and Wednesday, with
  light winds.

- Another push of low pressure will bring precipitation to
  higher terrain and south central Idaho by the middle of this
  week.

&&

.SHORT TERM /Through Wednesday Night/...
Issued 307 AM MDT MON SEP 14 2026
Scattered low clouds and patchy valley fog will develop this
morning, primarily in high terrain, but clearing will occur by late
morning into the early afternoon. A deep low pressure system will
move northeast of the region today, keeping cool temperatures
and breezy westerly winds over the region with some lingering
mountain showers across northeast Oregon and central Idaho. A
longwave trough will keep slightly below normal temperatures
tomorrow, but southwest flow aloft will bring a slight warming
and drying trend by Wednesday. Another low pressure system will
dive into western Oregon late Wednesday, with southerly flow
allowing for some monsoonal moisture to move northward over
south central Idaho. This low will then track to the east over
our region on Thursday, bringing a slight chance of showers and
cooler temperatures. Isolated thunderstorms are possible as
well, especially Thursday afternoon. Light and primarily terrain
driven winds will dominate the short term period, with slightly
increasing southerly winds on Thursday.

&&

.LONG TERM /Thursday through Monday/...
Issued 307 AM MDT MON SEP 14 2026
Cool and unsettled conditions will continue on Friday, with showers
lingering over high terrain. Precipitation accumulations look to be
minimal and isolated to higher elevations in Baker County, OR and
the West Central Mountains. A short lived pattern shift will then
occur by the weekend. Model solutions have come into alignment over
the ridge of high pressure developing over the Intermountain West by
Saturday. This will bring above normal temperatures and dry
conditions through Monday, but another trough looks to move onshore
by the middle of next week.

&&

.AVIATION /12Z Monday through Tuesday/...
Issued 612 AM MDT MON SEP 14 2026

Generally VFR. Scattered low stratus across Baker County and
the west-central Idaho mountains creating mountain obscuration,
mixing out by early afternoon. Patchy valley fog/mist this
morning near KBKE, KMYL, and KBNO. Surface winds: SW-NW 5-15 kt.
Winds aloft at 10kft MSL: W to NW 15-35 kt.

KBOI...VFR. Mid level clouds lowering to 3500-5000 ft AGL between
Mon/12Z-15Z, then clearing by the afternoon. Surface winds: NW 4-8
kt becoming variable less than 5 kt this evening, then ESE 4-8
kt by Tues/10Z.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.

OR...None.

&&

$$

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