Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 261007

Area Forecast Discussion
National Weather Service Missoula MT
407 AM MDT Mon Sep 26 2016


High pressure will be present over the Northern Rockies through
Wednesday. Anticipate dry, warm afternoons, followed by clear,
cold overnights. One exception to the warming trend will be near
Glacier Park on Wednesday, when relatively cool air is expected to
spill over the Continental Divide. Winds will gust to 25 mph along
the Continental Divide for much of Wednesday.

A trough of low pressure over the Pacific Coast slowly moving east will
cause moisture to stream over the Northern Rockies under southwesterly
flow by Thursday afternoon. Instability ahead of this trough will lead
to chances for thunderstorms during the afternoon. This pattern
continues on Friday, and will perhaps be even better for
thunderstorm formation, particularly in northwest Montana. Friday
will be the last day of above normal highs before the low pressure
system moves overhead and cools temperatures.

The trough moving in over the weekend will mean chances for rain,
cooler than normal temperatures, and snow levels supportive of
mountain snow. Models differ on timing of moisture; however, all
agree on the general change to cooler and wetter conditions.



Patchy valley fog this morning will be followed by mostly clear
skies for the Northern Rockies airspace. Little in the way of fog
is anticipated for any terminal; however, fog will be most
pronounced near bodies of water. Otherwise, very light winds will
be present throughout the region during the next 24 hours.



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