030
FXUS65 KBOI 272115
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
215 PM MST Thu Nov 27 2025

.SHORT TERM...Tonight through Saturday night...Fog has mostly
lifted to low clouds, clearing fully behind a band of high
clouds as it moves west to east across the area. The clouds have
hung on long enough to reduce forecast max temps for portions of
SW Idaho, especially those that had fog this morning. An upper
level trough moves through all day Friday, bringing a cold front
Friday morning. Ahead of the cold front winds will gust to 15-25
mph, especially along ridges this evening. Additionally, fog may
have enough time to reform in sheltered valleys tomorrow morning
as surfaces remain fairly saturated, though pre-frontal winds
and partly cloudy skies in the forecast lower confidence.

As the front passes tomorrow morning precipitation chances rise
to 40-60% in high elevation and 10-20% in lower elevations.
Precip remains generally north of Mountain Home, but snow levels
drop from 5-6 kft MSL to 3-4 kft MSL Friday night. Forecast
rainfall/liquid equivalent didn`t change much from this
morning`s forecast, still up to 0.1 inches in mountain valleys
and up to 0.2 inches on summits. Snowfall less than 1 inch
expected below 5.5 kft, and up to 2-3 inches above that. Friday
afternoon and evening gusts pick up in the upper Snake Plain
including the Magic Valley, up to 35 mph in open areas and
ridges. Friday will be about 5 degrees colder than Thursday and
Saturday 5 degrees colder than Friday, ending up about normal
for this time of year. Confidence has increased concerning a
system moving in Saturday night, with low QPF amounts up to 0.05
inches. However, the timing of this system overnight with
colder air in place means this could be the first sight of
flurries for many low areas, including the Treasure Valley and
Magic Valley. Most of the area has a 20-30% chance of
precipitation.

.LONG TERM...Sunday through Thursday...Drier conditions with
gusty northwesterly winds will move into the area behind the exiting
shortwave trough on Sunday afternoon. Dry weather will continue on
Monday with winds slackening.  A new upper level shortwave trough
will move through the area on Tuesday spreading another round of
precipitation across southwestern Idaho and southeastern Oregon.
Snow levels on Tuesday are expected to be around 3000 feet which is
a little lower than previously forecast and now support a mix of
rain and snow in valley locations and light snow accumulations above
about 3500 feet. The upper flow turns more northerly with available
moisture and chances of precipitation decreasing on Wednesday and
Thursday. Temperatures during the extend forecast period will be
near normal for early December.

&&

.AVIATION...VFR conditions can be expected in most areas of
southwestern Idaho and southeastern Oregon through early this
evening. However, areas fog are likely to develop in valley
locations again early Friday morning potentially impacting KBOI,
KEUL, KONO, KMYL terminals with IFR/LIFR visibilities. Surface
winds: light and variable though Friday Morning, becoming
northwesterly at 10 to 15 kts on Friday afternoon. Winds aloft at
10kft MSL: NW 20-25 kt.

KBOI...VFR conditions expected through this evening. Fog is likely to
redevelop after 06Z and bring IFR/LIFR visibilities to the terminal
again through early Friday morning.  A cold front will arrive around
12Z, shifting winds to a northwesterly direction and mixing fog out
of the area.  Winds will be light and variable overnight and then
shift to northwest 10 to 15 kts on Friday behind the cold front.

Weekend outlook...A cold front will return precipitation late
Saturday through early Sunday, with snowfall likely in the mountains
and light rain and/or snow in the lower elevations. Snow levels
around 4000 feet on Saturday will fall to around 3000 feet on
Saturday night. Winds E-SE 5-10 kt Saturday becoming W-NW 5-10 kt
Sunday, with afternoon gusts 15-20 kt

&&

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

&&

$$

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SHORT TERM...JM
LONG TERM....JB
AVIATION.....JB