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Forecast Discussion for Boise, ID

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142
FXUS65 KBOI 202133
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
233 PM MST Fri Feb 20 2026

.SHORT TERM...Tonight through Sunday night...One more cold night as
the main upper trough exits east, then 5-10 degrees warmer Saturday
and another 5 to 10 degrees Sunday as a broad Pacific upper ridge
comes inland and replaces the trough. Warm-frontal clouds will make
Saturday night warmer than tonight along with a slight chance of
rain and snow in the northern-most mountains, then decreasing
clouds in the warm sector will make Sunday warmer than Saturday.
In addition, deep surface low pressure off the coast will produce
gusty south or east winds 15 to 30 mph in our CWA Saturday through
Sunday, even persisting through the nighttime hours.

.LONG TERM...Monday through Friday...Warming continues with strong
southwesterly flow aloft as a deep low approaches. Temps on Monday
reach around 10 degrees above normal with gusty winds ahead of the
precipitation coming that night. Precip chances rise to 50- 90%
Monday evening through Tuesday as a strong moisture core passes
over the area. Chances are higher over higher terrain, but the
warm temps will keep snow levels elevated at about 6 kft MSL.
Moderate precipitation totals are likely, with heavier amounts
in the mountains favored by strong flow aloft. Temperatures on
Tuesday will cool by several degrees. Snow levels drop behind
the system on Wednesday morning to 3-5 kft MSL, though much
drier air will end the period of widespread precipitation.
Lingering showers on Wednesday will clear out by Thursday as
the moisture moves north of the area. A slight chance of
precipitation remains through the rest of the week, though most
deterministic runs shows the moisture staying north of the
forecast area. Gusty winds continue each afternoon.

&&

.AVIATION...VFR and low-mid level ceilings. Fog in mountain
valleys is possible Saturday morning. Surface winds: SW-NW
5-15 kt with gusts up to 25 kt near KTWF/KJER, becoming S-SE
tonight. Winds aloft at 10kft MSL: W 10-20 kt.

KBOI...VFR. Surface winds: NW 4-9 kt becoming SE tonight.

Weekend Outlook...Mostly VFR. Local IFR fog in mtn valleys
each morning. Surface winds: SE 5-15 kt with gusts up to 20 kt,
except in highlands and the Snake Plain where gusts up to 30 kt
are possible.

&&

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

&&

$$

www.weather.gov/Boise

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SHORT TERM...LC
LONG TERM....JM
AVIATION.....JM

Previous Forecast Discussions may be found at
NWS Boise, ID (BOI) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)

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