939
FXUS65 KBOI 012106
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
206 PM MST Sun Nov 1 2026

.KEY MESSAGES...
- Rain and high elevation snow decreasing from west to east
  today.

- Cooler with gusty winds today and tonight. Near to slightly
  above normal temperatures through the week.

- Dry Monday through Wednesday, then a slight chance of
  precipitation late week.

&&

.SHORT TERM /Through Tuesday Night/...
A Pacific cold front exiting east of the region early this
evening will leave a strong post-frontal surface pressure
gradient across southern Idaho. Gusty westerly winds will remain
the primary impact through late this evening, especially along
the Interstate 84 corridor from Mountain Home through the
Western Magic Valley. In these areas, sustained winds of 20 to
30 mph with peak gusts reaching 45 mph before winds steadily
taper off after midnight as the gradient relaxes and surface
decoupling occurs.

Behind the front, scattered shower activity over the central
Idaho mountains will diminish overnight, giving way to clearing
skies. Patchy valley fog may develop early Monday morning in
sheltered basins that received wetting rains, particularly
across southeast Oregon and west-central Idaho. However, its
unlikely fog will develop across the Snake Plain given sustained
winds overnight.

A transitory upper-level ridge builds overhead Monday into
Monday night, yielding dry conditions and near-normal daytime
temperatures. Mid and high clouds increase on Tuesday ahead of
the next weak shortwave trough advancing out of the eastern
Pacific. Model guidance keeps the bulk of moisture and upper
support split north and south of our forecast area, with
precipitation chances limited mainly to isolated showers over
the higher terrain of the West Central Mountains late Tuesday
and Tuesday night. Temperatures through Tuesday night will
remain within a few degrees of seasonal normals.

&&

.LONG TERM /Wednesday through Sunday/...
The mid week low pressure system will be on the way out Wednesday,
resulting in breezy afternoon winds but little to no precipitation.
Additional systems will move by to the north on Thursday and Friday,
resulting in a 10-30% chance of showers on Thursday and a 20-40%
chance on Friday, highest across our northern CWA. Over the weekend,
an upper-level ridge is forecast to build with dry conditions
returning. The weak systems Wednesday through Friday will bring
slight cooling, but temperatures will still be near normal. Slightly
warmer temperatures will arrive over the weekend as the ridge builds
in.

&&

.AVIATION /18Z Sunday through Monday/...
Issued 1109 AM MST SUN NOV 1 2026

Showers across SW Idaho will decrease from W to E through the
day. Mountains obscured in precipitation. Generally VFR-MVFR in
rain showers, IFR-LIFR in mountain snow. However, areas of IFR-
LIFR stratus and/or fog will continue through early afternoon.
Snow levels 6000-8000 ft MSL. Surface winds: W-NW 10-20 kt with
gusts 20-35 kt from KBKE through the Snake Plain, strongest east
of KBOI. Winds aloft at 10kft MSL: N-NW 10-20 kt, increasing to
20-30 kt after Sun/21Z.

KBOI...MVFR-IFR low ceilings sticking around through morning,
with conditions improving to VFR by the afternoon. Surface
winds: NW 7-11 kt, increasing to 12-18 kt with gusts 20-30 kt
this afternoon and evening.

&&

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

OR...None.

&&

$$

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SHORT TERM...JDS
LONG TERM....CH
AVIATION.....CH