Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 232039

Area Forecast Discussion
National Weather Service Missoula MT
239 PM MDT Fri Mar 23 2018

.DISCUSSION...An active weather period will exist across the
Northern Rockies during the next 24 to 36 hours, but impacts
should be minimal. Scattered showers continue to develop across
the region this afternoon and evening. Then later tonight, a mid
level front moves over northwest Montana, which will be the focal
point for continuous precipitation. The main precipitation type
will be snow, which could cause light snow accumulations,
particularly in Lincoln county. During the day on Saturday, a cold
front will swing through the region. This front will bring
widespread snow to the Northern Rockies, but accumulations are
unlikely on most area roadways. However, Lookout and Lolo pass
could experience slick conditions during the morning hours. As the
front exits the region, a mid level circulation wraps moisture
back around into northwest Montana Saturday night. Lincoln and
northern Flathead counties will be impacted the most by steady
light snow during this time. By Sunday morning, northwest Montana
and the higher terrain of north central Idaho should receive a
storm total of 2 to 5 inches of new snow. While the remainder of
the region should only anticipated a dusting up to 2 inches.

A building ridge of high pressure along the US West Coast Monday
onward will shift upper level flow from southwesterly to
northwesterly. An embedded jet streak is anticipated to move over
the Northern Rockies around Wednesday, bringing valley rain and
mountain snow to the region. Snow impacts on roadways will be
fairly minor and confined to mountain passes. Past Wednesday, the
high pressure ridge drifts eastward and toward the Northern
Rockies. The closer the ridge moves to the region, the warmer and
drier the conditions will become.


.AVIATION...Shower activity will be increasing throughout the
afternoon and evening. These showers will be capable of producing
momentary reductions to visibilities and ceiling. A mid level
front will bring fairly steady precipitation across northwest
Montana later tonight. Then a cold front swings through the
Northern Rockies during the day on Saturday. All terminals will be
impacted by periods of snow, wind and low ceilings over the next
24 hours.



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