Area Forecast Discussion
Issued by NWS Missoula, MT

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000
FXUS65 KMSO 271207
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
506 AM MST THU NOV 27 2014

...WIDESPREAD SNOW AND A BLAST OF ARCTIC AIR TO IMPACT NORTHERN
ROCKIES THIS WEEKEND...

.DISCUSSION...

Periods of rain and snow will continue to be present across the
Northern Rockies through Friday, with temperature inversions
persisting within middle elevation valleys. Fog and freezing fog
will be present at times within area valleys throughout the
morning and early afternoons. Some of the fog will persist in
isolated pockets throughout each day.

Friday evening through Saturday, a very cold arctic airmass and
relatively mild Pacific airmass will interact over the Northern
Rockies, bringing widespread snowfall and another episode of very
cold temperatures to the region. Current weather models suggest
that the heaviest snowfall will occur across northwest Montana,
including the Glacier Park Region. Snowfall will combine with the
rush of cold air over the Continental Divide, creating blowing
snow conditions on Saturday followed by bitterly cold wind chill
Saturday evening. Wind gusts near 40 mph at the mouth of Hellgate
and Badrock Canyons and incoming cold air will create wind chill
temperatures well below zero. Also, considering the widespread
rainfall and melting snow between now and Saturday, a flash freeze
of water on pavement appears likely. Combining the impacts of
freezing pavement, heavy snowfall, blowing snow, and bitterly cold
wind chill, a significant safety hazard will exist for most of the
weekend, particularly for those traveling over area mountain
passes. Winds and snow will diminish during Sunday, with very cold
temperatures continuing to be present, particularly across
northwest Montana.

The cold temperatures will continue throughout next week, but will
slowly moderate as the region remains under a west or northwest
flow. There is potential for periods of rain/snow throughout the
week, but there is still much uncertainty on timing and amounts of
precipitation possible.

&&

.AVIATION...Freezing fog and low stratus will impact air terminals
KGPI, KMSO, and KSMN through at least 27/1200Z. Fog and stratus
may be interrupted by areas of rain/snow moving across airfields
periodically. Visibility and ceilings will improve after 27/1200Z,
however pockets of low clouds and low visibility will likely
obscure terrain surrounding most airfields throughout the day.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&

$$




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