479
FXUS65 KBOI 120944
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
344 AM MDT Mon Oct 12 2026

.KEY MESSAGES...
- Unsettled conditions through early Tuesday, mainly on the
  Idaho side, with showers mainly over Magic Valley and Boise
  Mountains.

- Snow levels near 5000-6500 ft MSL through Tuesday, with light
  snow showers continuing over higher terrain in southwest ID.

- Frost possible in the Snake Plain through Wednesday morning
  with temperatures 10 to 15 degrees below normal.

- Warm and dry conditions Wednesday through next weekend.

&&

.SHORT TERM /Through Wednesday Night/...The closed upper low
centered over eastern OR will slowly dive south into the Great
Basin today (Monday) through Tuesday, as its moisture load
gradually weakens. Elevated precipitation chances will continue
over the Magic Valley and the Boise Mountains this morning,
before diminishing in spatial coverage in the afternoon through
early Tuesday. Cooler temperatures 10 to 15 degrees below
normal, and more moderate northwest wind breezes, will be in
store today with the low passage. Snow levels in the 5000-6500
range over southwest ID will continue to favor light snow
showers over high terrain areas through early Tuesday. Late
Monday through early Tuesday, showers will be limited to the
lower Magic Valley area near the NV border, as the system moves
completely out of our area by late Tuesday. Overnight low
temperatures near freezing and high surface moisture will bring
morning frosts over most of the Snake Plain through Wednesday
morning. A Pacific high pressure will quickly build into the
area by late Tuesday, returning drier and warmer conditions
through Wednesday. Temperatures will climb to near- seasonal
normals Tuesday through Wednesday.

&&

.LONG TERM /Thursday through Monday/...A strong Pacific ridge
of high pressure will continue to build into the western CONUS,
keeping our area in a warm and dry trend Thursday through the
weekend. Temperatures 5 to 10 degrees above normal remain likely
Friday through Sunday. Mostly clear skies will be expected
throughout the long-term, with some overnight/morning fog
possible each day. Late Friday through early Saturday, a Pacific
longwave trough will dig into the northwest coast and keep our
area under a dry southwest flow. This flow will continue dry
conditions and above normal temperatures over the weekend. Come
Monday, a large upper low will slowly dive down from lower
British Columbia but keep our area under a strong southwest
flow. This pattern will likely continuing slightly above normal
temperatures on Monday. There is long-term guidance on
widespread precip associated with this low arriving by late
Monday, but its timing and magnitude remain slightly uncertain
for now.

&&

.AVIATION /06Z Monday through Tuesday/...
Issued 1140 PM MDT SUN OCT 11 2026
Generally VFR. Wrap-around moisture will bring light rain/mtn snow
overnight through Mon night, mainly in s-central/central Idaho and
NE Oregon. Low-VFR/MVFR in low stratus or rain, IFR-LIFR in mtn
snow. Mountains obscured in stratus/precip. Snow Levels: 5-7kft MSL
for SW Idaho, 3.5-5kft MSL in E Oregon. Surface winds: SW-NW 5-15
kt, with gusts 20-25 kt from KBKE-KONO, decreasing to 5-10 kt
overnight. Winds aloft at 10kft MSL: variable 5-15 kt, then NW 5-15
kt Mon afternoon.

KBOI...VFR and SCT/BKN low clouds. Surface winds: becoming NW 4-12
kt overnight through Monday.

&&

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

OR...None.

&&

$$

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SHORT TERM...JY
LONG TERM....JY
AVIATION.....SH