Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 212123

Area Forecast Discussion
National Weather Service Missoula MT
223 PM MST Sat Jan 21 2017

.DISCUSSION...An area of light snow across west-central Montana
will slowly work northward during the evening and overnight hours.
Northwest Montana will likely see a several-hour period of
snowfall, but accumulations will generally remain below an inch.
Meanwhile, only isolated snow showers will possible elsewhere
overnight. Conditions are marginally favorable for patchy fog by
early Sunday morning, but considerable cloud cover should limit
coverage and intensity. Still watch for changeable, slippery road
conditions due to the remnants of today`s snow, refreeze of wet
roads, and occasional reductions in visibility from fog.

A brief lull in precipitation will occur tomorrow morning before
the next wave of energy moves through central Idaho beginning in
the afternoon, and then into western Montana in the evening
through the overnight hours. This disturbance looks a bit
stronger than the one currently moving through the region.
Several inches of snow will be possible through central Idaho into
northwest Montana. The timing of this wave passing overnight will
likely allow for roads to become slick and snow covered.
Therefore, a winter weather advisory has been issued for portions
of central Idaho and northwest Montana. Additional areas may need
to be added, including the Seeley/Swan region and the Missoula
valley, though confidence in travel impacts in these areas is not
currently as high. Nevertheless, if traveling Sunday evening into
Monday morning, be prepared for changeable road conditions.

Snow will generally come to an end across the area by Monday
morning, though light showers will likely continue. Monday
afternoon and evening, a mid level circulation is expected to pass
through southern Idaho. This feature will spread light to moderate snow
into Lemhi County, ID and southwest Montana. Travel impacts due
to light snow will result.

A northerly flow is expected to set up over western Montana and
central Idaho Tuesday, and continue through much of next week.
Cool (below normal) temperatures, snow showers, and cloudy
conditions should be expected.


.AVIATION...Snow will taper off this afternoon at KMSO as it moves
northward, leading to several hours of light snow for KGPI this
evening. A few mountain snow flurries are possible early Sunday
morning, with the next wave of light to moderate snowfall
arriving Sunday afternoon through early Monday morning. Patchy
dense freezing fog may once again affect area terminals Sunday
morning, with KMSO the most likely to experience occasional
visibility reductions.


MT...     Winter Weather Advisory from 5 PM Sunday to 11 AM MST Monday
     Flathead/Mission Valleys...Kootenai/Cabinet Region...Lower
     Clark Fork Region...West Glacier Region.

ID...Winter Weather Advisory from 1 PM Sunday to 4 AM PST Monday
     ABOVE 2500 FEET for the Northern Clearwater Mountains...
     Southern Clearwater Mountains.


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