Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 190938

Area Forecast Discussion
National Weather Service Missoula MT
338 AM MDT Mon Mar 19 2018

Precipitation continues to be enhanced over northwest Montana
this morning into the afternoon. Additional snow accumulations of
4-8 inches are possible over the Continental Divide (Marias
Pass), and 1-4 inches in the lower elevations along US-2. The
Flathead Valley should see all rain or a rain/snow mix as they
hover around the mid 30s and experience locally breezy wind gusts.
Elsewhere, patchy fog has developed overnight in the valleys of
north-central Idaho and west-central Montana, and may linger
through the early morning hours.

Showers will begin to increase over north-central Idaho and
southwest Montana this afternoon and evening. Light snow may
accumulate briefly over Lost Trail Pass. Tonight, patchy fog will
once again be possible for the valleys overnight due to the
precedent moisture.

Conditions are forecast to improve on Tuesday for most of the
area, with the exception of a few showers over Lemhi County in the
afternoon/evening period.

Southwest flow aloft will return Wednesday, initiating scattered
convective showers over the area. These showers could bring about
bursts of rain, with the potential for snow and graupel at times.
Then, showers (potentially even a few thunderstorms) will be on
the increase Thursday, becoming widespread just ahead of a cold
front. This front is expected into north-central Idaho Thursday
afternoon pushing through western Montana on Thursday night. Snow
levels ahead of the front will be at 5000-6000 feet, then drop to
valleys floors behind the cold front for Friday. Mountain pass
roadways will likely become snow covered for at least a short
period of time leading to slower travel late Thursday through
Friday morning. Gusty winds are also expected with the front
lasting into Friday.

Cool and unsettled weather will continue into the weekend as a
large low pressure trough remains over the Pacific Northwest.
Periods of mountain snow and below normal temperatures will be
common with occasional snow showers even to the valley floors.


.AVIATION...Vicinity showers with brief periods of light
rain/snow are forecast for KMSO and KGPI through the morning
hours. Reduced visibility and lower ceilings can be expected with
passing showers, with mountain obscurations. Shower activity will
start to trend down after 19/1800Z for northwest Montana. For
north-central Idaho and Lemhi County, showers will start to
increase this morning and afternoon in the vicinity of KSMN. After
20/0600Z, patchy fog is possible once again around KMSO and KGPI.


MT...Winter Weather Advisory until noon MDT today West Glacier Region.


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