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000
FXUS65 KMSO 242022
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
222 PM MDT Sat Oct 24 2020

.DISCUSSION...Snow showers remain mainly south of Highway 12.
Most of the impacts from continued snow are in the Butte/Blackfoot
region including I-90 south of Deerlodge and Homestake and
MacDonald passes. North and east winds will cause periods of
drifting snow, but this should not be a widespread impact. Any
lingering snowfall is forecast to come to an end by this evening.

Easterly winds will remain into the overnight, so cold wind chills
are expected, especially along and near the Divide. Very cold
overnight temperatures are also expected with most of western
Montana to have low temperatures in the low single digits to
around negative 10, and widespread single digit lows in central
Idaho.

Wind should mostly end on Sunday with cold daytime temperatures
in the teens and 20s. Cold daytime temperatures will lead into
another cold night, likely even colder in many places than
tonight given less wind and a crystal clear sky.

A warmer airmass is forecast to move over the cold air in place
during Monday. This setup usually causes another round of snow,
and model guidance are beginning to show snow chances. The
forecast has been updated for Monday to show chances for snow in
the Glacier Region, central Idaho, and west-central Montana.
Confidence in snow amounts is low at this time, but the forecast
for the second half of Monday and into Monday night will need to
be monitored.

The weather pattern for this week points to warming temperatures,
but significant snow cover will likely keep most valleys from
warming. There may also be a few weak weather disturbance that may
bring cloud cover and snow showers.


&&

.AVIATION...Brisk east winds will continue to overspread western
Montana. Gusty conditions will continue at KMSO and
KGPI into this evening as cold air continues to push into the
region. Temperatures will approach zero degrees or below zero
Sunday morning with some breezy winds continuing through the
canyons leading west from the Continental Divide. Although
exceptionally cold for October, weather conditions on Sunday will
otherwise be quite nice areawide.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Winter Storm Warning until 6 PM MDT this evening Butte/Blackfoot
     Region.

ID...Winter Weather Advisory until 5 PM PDT this afternoon
     Orofino/Grangeville Region.

     Winter Weather Advisory until 6 PM MDT this evening Eastern
     Lemhi County...Western Lemhi County.

     Winter Weather Advisory until 5 PM PDT this afternoon ABOVE 3500
     FEET for the Lower Hells Canyon/Salmon River Region.

&&

$$