Weather Service Report

FXUS65 KMSO 272151

Area Forecast Discussion
National Weather Service Missoula MT
251 PM MST FRI NOV 27 2015

Persistent dry and cold weather will continue through the weekend
as the area remains between high pressure across British Columbia
and low pressure over the Great Basin. Inversions will hold strong
over the valleys, with morning lows dropping into the single
digits and below zero, while daytime highs reach into the teens
and 20s. Low stratus over the valleys of northwest Montana will
continue, while low clouds and fog will likely become more
widespread and persistent for the valleys of west central Montana
such as the Missoula and Bitterroot Valleys over the weekend. A
few flurries may fall from the low clouds but the main impact will
be reduced visibility and potentially slippery roads from patchy
dense freezing fog.

By late Sunday, the low pressure over the Great Basin will lift
into Northern Plains which may lead to a few snow flurries from
Lemhi County into southwest Montana but impacts will be minimal.
Low clouds and fog are expected to continue to plague the valleys
of western Montana early next week as inversions remain in place
under a ridge of high pressure.

There is potential for weak systems to penetrate the strong upper
level ridge over the west by mid-week. Models may be overdone with
the precipitation they spread over the region beginning about
Wednesday. However, any frozen or freezing precipitation can
rapidly lead to travel problems. Valley inversions will remain
strongly in place for most of the week but with warmer conditions
developing in the higher elevations by mid-week. There does not
appear to be a strong enough system to remove valley inversions
until at least next Friday.


.AVIATION...Stratus will continue to plague KGPI with low ceiling
heights through at least the next 24 hours with little significant
improvement. Favorable flying conditions is expected elsewhere
with sunny skies and light winds this afternoon and evening. Clear
skies tonight will once again lead to the development of fog or
stratus for KBTM and KMSO on Saturday morning. 


Stable conditions and inversions will continue through the middle
of next week resulting in stagnant air which could lead to air
quality issues, especially for the valleys of western Montana.
Some improvement is possible late next week as the ridge of high
pressure breaks down and valley cold pools gradually erode.




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Western Regional Climate Center,