Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 241033

Area Forecast Discussion
National Weather Service Missoula MT
333 AM MST Fri Feb 24 2017

.DISCUSSION...A slow moving low pressure system will continue to
wrap moisture into southwest Montana and Lemhi County today. Light
snow will result, causing slick and snow covered roadways for the
morning commute. Locations near Butte, including Homestake Pass
and westward towards Georgetown Lake have seen some of the best
snow accumulations overnight, so roads will be most impacted in
these areas. Snow intensity will generally decrease through the
morning as the low pressure system continues to meander eastward.
Farther north, generally north of the Interstate 90 corridor,
cool yet dry conditions will persist.

A weak wave of energy will pass on Saturday, increasing clouds and
bringing a period of snow showers to northwest Montana, though any
resulting snow accumulations should be light. Breezy and cool
conditions will occur area wide.

An elongated split trough will move into the Pacific Northwest on
Sunday. This system will initiate widespread snowfall across
northwest/west-central Montana and portions of north-central Idaho
throughout Sunday. The ID/MT border will be under a persistent
northwest flow that is favorable for several inches of snow on
mountain passes such as Lookout, Lolo, and Marias Passes. By
Monday into Tuesday, the main energy of the trough axis enhances
precipitation across the Northern Rockies, producing additional
accumulating snowfall for north-central Idaho and western Montana.
Over this prolonged period of persistent snow, both mountain
passes and valley locations will be susceptible to periods of
winter driving conditions with lower visibility and snow-covered

Unsettled and cool conditions will continue through the rest of
the week, with snow showers remaining in the forecast, especially
in the higher terrain. Breezy winds will become more noticeable
by mid to late week. Winds will help slowly warm temperatures
closer to normal for this time of year and will begin to cause
some downsloping effects in the larger valleys.


.AVIATION...A slow moving low pressure system continues to wrap
moisture in the form of snow showers into southwest Montana and
central Idaho this morning. Low ceilings and visibility will
cause the higher terrain to be obscured at times, generally south
of the Interstate 90 corridor. KBTM continues to be periodically
affected by light snow, which will last through much of this
morning. KSMN will also see some light snow showers at times,
though impacts are expected to be minimal. The low pressure system
will continue to drift eastward with time, slowly decrease shower
coverage and intensity through this afternoon. North of Interstate
90, generally dry though cloudy conditions are expected with
patchy valley fog across far northwest Montana this morning.



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