Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 201000

Area Forecast Discussion
National Weather Service Missoula MT
400 AM MDT SAT SEP 20 2014


High pressure will be the dominant weather feature over the
Northern Rockies through the weekend. Following patchy valley fog
this morning, conditions will be steadily warming and drying
through early next week. An exception to the drying will be found
across far southwest Montana and Lemhi County in Idaho, where
remnant moisture of tropical system Odile is anticipated to pass
overhead. Compared to the high-certainty forecast of this high
pressure event, the Odile moisture and subsequent precipitation
moving over Lemhi County is relatively less certain.

Clouds will increase across the Northern Rockies early next week,
ahead of a significant Pacific storm system expected later in the
week. Daytime temperatures will remain warm, however overnight
temperatures on middle and high elevation terrain will become
exceptionally warm.

A big change from above normal temperatures on Wednesday to below
normal temperatures and above normal chance for precipitation is
still possible by next weekend. There will be an increasing
chance for showers and perhaps a few thunderstorms on Thursday.
There are sizable differences between the weather models with the
evolution of this incoming trough, so forecast confidence is



Aside from some middle and high altitude cloudiness, few aviation
weather impacts will exist during the next 24 hours. Surface winds
will be quite weak at all area terminals during this time.




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