Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 242045

Area Forecast Discussion
National Weather Service Missoula MT
245 PM MDT Sat Sep 24 2016

.DISCUSSION...Cloud cover and mountain showers remain over western
Montana and central Idaho this afternoon under northwest flow
aloft. Drier air will gradually move over the region tonight, which
will slowly diminish cloud cover. Clearing skies will allow for
some valley fog formation and also some chilly temperatures.

A ridge of high pressure strengthens over the Northern Rockies
Sunday into early next week, bringing abundant sunshine and above
normal temperatures. Clear skies Sunday night will set up
favorable conditions for radiational cooling. Valley fog will
again be a concern. Many valley locations, particularly in western
Montana may see temperatures drop to, or even below freezing. Any
surviving sensitive vegetation will likely need to be protected.

Forecast models continue to indicate the ridge of high pressure
will weaken by late next week. This will bring an increased chance
of showers and cooler temperatures.


.AVIATION...An upper level ridge with warmer and drier weather
will build into the region and last through Monday Sep. 26. Cloud
cover will diminish gradually this afternoon through 25/1200z most
areas but may linger towards the Canadian Border and Glacier
National Park. There is a chance for patchy fog in the valleys
and mountain passes across north-central Idaho and western
Montana Sunday morning.



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