Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 242144

Area Forecast Discussion
National Weather Service Missoula MT
244 PM MST SAT JAN 24 2015


A relatively warm, yet weak storm system over the Northern Rockies
will dissipate through midday Sunday. Scattered light rain and
high elevation snow will be present at times, particularly across
northwest Montana during this time. Few impacts will arise
directly from this weather scenario, however the moisture left
behind will result in some patchy valley fog development across
the region on Sunday morning.

High pressure will be solidly in-place over the Northern Rockies
Monday and Tuesday, with temperatures warming greatly over the
high terrain and stagnant air settling into area valleys due to
temperature inversions. Daily overnight and morning fog will
continue to be present in valley locations. Some open plains and
southern valley locations, like Hamilton and Grangeville, will see
near-record warm temperatures on Monday.

Another relatively warm, yet weak storm system is anticipated in
bringing valley rain and mountain snow to mainly southwest
Montana and central Idaho on Wednesday. Again, the direct impacts
from this system are expected to be minimal, however the
precipitation will be conducive to fog on Thursday morning.

Some long range models suggest that an arctic airmass will be near
the Continental Divide by late Thursday night, with some very
cold air filtering into the valleys along and just west of the
Divide. Even in the event that the cold air does make it west of
the Divide, the cold event will likely be short-lived to a few
days. Confidence in the arctic airmass impacting the Northern
Rockies is low to moderate at this time.


Periods of light rain are possible for the TAF sites through this
afternoon and evening and expected to taper off overnight. Low
ceilings, a slight decrease in visibility, and mountain
obscurations are possible with heavier showers. Low to mid level
cloud ceilings are expected to stick around through Sunday. Patchy
fog may be possible in the vicinity for KGPI and KMSO after



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