Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 232142

Area Forecast Discussion
National Weather Service Missoula MT
242 PM MST Thu Feb 23 2017


An area of cold air aloft will be present over the Northern
Rockies through Friday, bringing cool temperatures to the region.
A surface low pressure over the Snake River Plain will continue
to stream snow showers over southwest Montana and Lemhi County
Idaho during this time, with some icy, snow covered roadways
possible for extreme southern Lemhi County tonight through Friday
morning. Confidence in this impact is a bit low, with the snow
accumulations most likely south of the area. Mountain passes from
Lost Trail Pass southward will see periodic snow on the roadways,
too. Breaks in the clouds across the Kootenai region of northwest
Montana will allow some patchy freezing fog to develop tonight
through Friday morning as well, with travelers impacted by
visibility suddenly dropping in spots.

The region will remain under a cold airmass through the weekend,
with waves of moisture moving through the flow producing light
snow showers down to valley floors. While precip should remain
light, there is a heightened potential for more moderate snow to
fall across Clearwater and Idaho counties Monday through Tuesday.
Minor snow accumulations (no more than 6 inches) could fall
during this time, including mountain pass highways crossing over
the Idaho/Montana border. Right now, it`s hard to distinguish
exact placement of heaviest precip, but in essence: expect Monday
into Tuesday to be a generally snowy period for north central
Idaho and parts of west central Montana as well.

Northwest flow becomes the dominant flow pattern Wednesday onward,
with light snow and continued cool temperatures likely to



Snow showers over the Northern Rockies will slowly drift
southward throughout the next 24 hours. KSMN will be impacted by
snow showers in brief spurts through 24/0600Z, with lowered
visibility and ceilings. For KMSO and KBTM, most of an vicinity
snow shower activity will cease after 24/0000Z, however no showers
are anticipated to have an impact directly on these airfields.
Terrain obscurations will exist, however the most significant
impact will be confined to south of KBTM and KSMN. Patchy freezing
fog will develop over far northwest Montana (west of KGPI)
24/1000Z through 24/1600Z as well.



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