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Area forecast discussion 
National Weather Service Missoula Montana
209 PM MST sun Feb 7 2016

Discussion...high pressure will dominate over western Montana and
central Idaho for much of this week. This will result in generally
stable atmospheric conditions, meaning that air quality will
deteriorate through the week due to stagnant air, trapping
particulates. Mornings will start quite chilly in the valleys due
to the dry airmass in place, particularly for valley locations
that still have ample snow on the ground. However, afternoon
temperatures will be quite mild, especially for higher valleys and
in the mountains. The biggest forecast challenge will be the
development of fog and low stratus. With an overall dry airmass,
widespread development does not look likely at this time. However,
as temperatures warm and melt some snow later this week, that
could add enough moisture to make fog formation more likely.
Locations that do see fog or stratus develop will likely see
cooler daytime temperatures than currently reflected in the

A change in the weather pattern is not being indicated until
Friday night into Saturday, when a trough of low pressure is
expected to move through the region. Increased chances of snow and
valley rain/snow should be anticipated with temperatures
returning closer to seasonal normals. This weather system will
also likely help to improve air quality.


Aviation...passing mid to high clouds will be moving over the
northern rockies, with the potential for very light showers possible
over the Glacier National Park region. Breezy winds will be
possible over the Continental Divide through Monday. Current
lamp/MOS guidance suggests low stratus or fog could be of concern
for the Flathead/mission/Missoula valleys and the Camas Prairie
region in central Idaho by early Monday morning, resulting in
mountain obscurations and periods of reduced visibility. However,
forecast confidence for reaching IFR/LIFR visibility remains low.


Mso watches/warnings/advisories...


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