710
FXUS65 KBOI 012138
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
238 PM MST Mon Dec 1 2025

.SHORT TERM...Tonight through Wednesday night...A weak system is
moving across north central OR, northern ID and eastern WA this
afternoon. This will bring light precipitation to the area later
this afternoon into the evening. A cold front situated near
Vancouver Island will move through the area on Tuesday, bringing
cooler air aloft and unstable air. This will provide enough lift
for rain and snow showers Tuesday during the day, with snow
levels around 3000-4000`. Minimal precipitation expected with
this system, with snow accumulations around 1-2" in the
mountains. Dry conditions on Wednesday following the front. The
system will bring low clouds and fog to the area on Wednesday
as upper level ridging builds in behind the cold front. Forecast
confidence is low on the post frontal cloud development though.
Temperatures remain near normal.

.LONG TERM...Thursday through Monday...An unsettled pattern will
develop through the period. A upper level ridge situated off of
the west coast will begin to break down throughout the day
Thursday. While the first shortwave Thursday morning lacks
moisture to provide anything more than increased clouds, it will
help flatten the ridge allowing for Pacific moisture to start
streaming into our area behind it. This moisture advection will
allow for increasing precipitation chances Thursday evening.
Precipitation chances will increase to 10-20% in lower
elevations and 20-60% in higher elevations (highest in the West
Central Mountains) by Thursday night. Another shortwave is set
to move across our area Friday/early Saturday, bringing the
highest precipitation chances of the period Saturday morning.
With chances increasing to 40-60% across lower elevations and
60-90% in higher elevations (per usual, chances higher in the
West Central and Boise Mountains).

With the jet stream overhead, there will be multiple periods of
precipitation into early next week as shortwaves come and go.
While  it is too far out to resolve the exact timing and
strength, this pattern will support precipitation chances
continuing into Monday. Snow levels will vary throughout the
week, climbing to 5.5-7.5kft MSL late Friday. Beyond Friday,
snow levels will trend down to 4.5- 5.5kft MSL come Monday.
Temperatures will stay 5-10 degrees above normal throughout the
period.

&&

.AVIATION...Mainly VFR. MVFR/IFR conditions this evening and
Saturday morning in the central ID mountains with low ceilings
and snow showers. LIFR conditions possible in snow. Isolated
showers expanding across the area Tuesday morning. Snow levels:
2-4kft MSL. Surface winds: variable up to 10 kt. Winds aloft at
10kft MSL: NW 15- 25 kt.

KBOI...VFR under increasing mid to high clouds. A 20% chance of
rain/snow mix after Tue/12z. Surface winds: Light and variable.

&&

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

&&

$$

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SHORT TERM...KA
LONG TERM....NF
AVIATION.....NF