Area Forecast Discussion
Issued by NWS Boise, ID

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799
FXUS65 KBOI 180219
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
819 PM MDT Sat Apr 17 2021

.DISCUSSION...No forecast changes this evening. Clear tonight
then sunny and warmer Sunday except for increasing clouds late
in the day in central Idaho as a cold front approaches from the
north. The front will pass through late Monday night or early
Tuesday morning, stronger in Idaho than in Oregon. Monday will
be windy and cooler.

&&

.AVIATION...VFR. Mostly clear. Surface winds variable at
less than 10kt then becoming northwest around 10 kt aft 18/18z.
Winds aloft at 10k feet MSL north to northeast, becoming north to
northwest 10-20kt by 18/06z.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Monday night...Dry through Sunday
under the influence of a ridge along the West Coast. Breezy
northeast winds in the Magic Valley diminishing this evening, then
breezy northwest winds across the Snake Plain on Sunday. A cold
front will drop down in northerly flow early Monday morning
bringing much stronger northerly winds to most areas on Monday.
Some showers are possible with the front early Monday, especially
in the central Idaho mountains east of McCall, but most of the
showers will be farther to the east in eastern Idaho and Wyoming.
Quite a bit cooler on Monday behind the front, but still likely a
few degrees above normal. Monday night should be quite chilly
with diminishing winds and clear skies behind the cold front.

LONG TERM...Tuesday through Saturday...Ensembles agree that a
weak Pacific system, with very little moisture, will move through
an offshore ridge and drift inland south of our area Tuesday. Any
precipitation is expected to be on Wednesday over the central
Idaho mountains and the higher terrain south of the Snake River
Valley, but chances are slight. Ensembles currently show the ridge
shifting east over the coast on Friday and inland on Saturday,
continuing the warming trend that started on Tuesday. Temperatures
will be a couple of degrees above normal Tuesday and Wednesday
and 5-10 degrees above normal Thursday through Saturday. Exact
numbers are still uncertain, especially highs Friday and Saturday.

&&

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

&&

$$

www.weather.gov/Boise
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DISCUSSION...LC
AVIATION.....CR
PREV SHORT TERM...TB
PREV LONG TERM....AL



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