707
FXUS65 KBOI 251637
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
937 AM MST Tue Nov 25 2025

.DISCUSSION...No updates to the forecast this morning. General
ridging will introduce a warming trend, but a low well into the
Pacific will squeeze some moisture through the area tonight
through Thursday. Most of the precipitable water will pass by on
Wednesday, with a forecast 0.5-0.6 PWAT which is near the 85th
percentile. The plume of moisture will mostly impact the
northern 1/3 of our CWA, with precipitation chances 60-90%
increasing with height and latitude. The warming trend will
gradually lift snow levels from 3000-4000 ft MSL Wednesday
morning to 6000-7000 ft MSL Wednesday night. Up to 2 inches of
snow are possible in mountain towns that morning before the
warmup, which will switch the precipitation to rain and help
melt snow accumulation in mountain valleys. Ridges could see 3-5
inches of snow, more north of our area. Temperatures by
Thursday warm to about 10 degrees above normal.

&&

.AVIATION...VFR. MVFR/IFR conditions possible in the west-central
Idaho mountains from lowering ceilings and snow showers this
afternoon into evening. Mountains becoming obscured gradually
west- to-east this afternoon into evening. Snows levels
3000-4000 ft MSL. Surface winds: variable under 10 kt. Winds
aloft at 10kft MSL: W-NW 20-30kt, becoming W-NW 30-40kt by
06z/Wednesday.

KBOI...VFR and mostly clear with few high clouds. Surface
winds: SE 5-10kt.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Thursday night...Monday`s cold front
has left our CWA 8 to 15 degrees colder than early yesterday
morning, but the core of cold air will shift east of our CWA
this afternoon. High temps today will be several degrees colder
than yesterday in our eastern-most areas, but near yesterday`s
highs in Oregon. A Pacific warm front will spread light snow
across the northern third of our CWA late today through
Wednesday. The southern 2/3 of our CWA will become cloudy but
should stay dry. Pcpn in the north will decrease gradually from
south to north later Wednesday through Thursday, but snow will
also mix with or change to rain up to 5500 feet MSL. Pcpn will
increase again Thursday night as the system`s cold front moves
through, with snow level lowering again to about 4800 feet,
changing rain back to snow. Initial snow levels (tonight through
Wednesday) have also been lowered 300-600 feet from previous
forecast, as NBM has become a high- outlier. This means slightly
greater expected snow accumulation through Wednesday, with McCall
now forecast to receive about 2.0 inches vs 1.5 inches previously.
Winds will be generally light southeast through Thursday, then
becoming light northwest behind Thursday night`s cold front.

LONG TERM...Friday through Tuesday...A shortwave trough digging
over the Northwest region will steer a cold front across the area
Friday. This cold front will bring a gradual cooling trend Friday
through the weekend, gradually dropping lower elevation
temperatures from the upper 40s/lower 50s Friday into the upper
30s/lower 40s Saturday and Sunday, with higher elevations seeing
a drop from the upper 30s into the upper 20s. Snow levels are
expected to gradually drop from the 3000-4000 ft range Friday
and into the 2000-3000 ft range Saturday through Sunday. Friday
will see a 30-40% chance of mixed precipitation over higher
elevations. Saturday will see a 20-30% chance of rain over lower
elevations and a 30-40% chance of snow over mountains. Sunday
will see a weaker shortwave trough dig across the region, but
with uncertainty over its digging pattern and moisture content.
For now, a 20-30% chance of snow over the mountains is forecast
for the early hours of Sunday. Monday through early Tuesday
will see broad ridging that will bring drier conditions and a
weak warming trend into the lower 40s. Long-term guidances
suggest another trough from W`rn British Columbia digging into
the area late Tuesday, tentatively returning a cooling trend and
widespread precipitation over the area.

&&

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

&&

$$

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DISCUSSION...JM
AVIATION.....CH
SHORT TERM...LC
LONG TERM....JY