Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 200928

Area Forecast Discussion
National Weather Service Missoula MT
328 AM MDT Tue Mar 20 2018

Showers have mostly diminished this morning over the northern
Rockies, leaving behind cool mid-level cloud cover and a few
pockets of valley fog. Otherwise, anticipate a mild day today with
temperatures reaching the 40s and 50s in the valleys. Models
indicate there could be a few isolated showers over northwest
Montana and north-central Idaho this afternoon and evening, but
these are not expected to be much of an impact.

Brief high pressure will allow mild daytime temperatures to
continue for Wednesday. A few isolated showers (with perhaps a
lightning strike or two) are possible in an increasingly unstable
& moistening atmosphere by late Wednesday afternoon and evening
ahead of the next weather system.

A relatively strong cold front will work into north-central Idaho
Thursday evening and progress through western Montana into early
Friday morning. Periods of showers are expected ahead of the front
on Thursday, with showers becoming widespread just ahead of and
along the front. Snow levels will be above most mountain passes
initially, then a quick burst of snow is likely along the front
leading to slick and snow covered roadways at pass levels by early
Friday morning. Gusty westerly winds are also expected with the
front lasting into Friday.

Cool and unsettled weather will continue Friday into the weekend
as a large low pressure trough remains over the Pacific Northwest.
A few weak disturbances will bring periods of snow with
occasional light snow even to valleys floors. Daytime temperatures
will run about 10 degrees below normal with periodic breezes so
it will feel quite chilly for late March.


.AVIATION...Patchy valley fog and low to mid clouds have developed
in the valleys, and may move into the vicinity of KMSO and KGPI
through the morning hours. Otherwise, a general warming and
drying trend is expected today. Isolated rain/snow showers are
possible for northwest Montana and north-central Idaho in the
vicinity of KGPI and KSMN after 20/2100Z, which could briefly
reduce visibility and create mountain obscurations.



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