Snow Avalanche Guidance
Issued by NWS Missoula, MT

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FWUS45 KMSO 201131
SAGMSO

Backcountry Forecast for western Montana and north central Idaho
National Weather Service Missoula MT
431 AM MST Tue Feb 20 2018

DISCUSSION:

A slowly modifying arctic airmass will remain over the Northern
Rockies for the next several days as temperatures remain 15 to 20
degrees below normal. A trough of low pressure digs into the
Pacific Northwest this afternoon. The bulk of the energy will be
over Washington this afternoon and evening, but enough instability
will be over northwest Montana to create a few snow showers. New
snow accumulations will be light, from a dusting to potentially an
inch. This trough swings through Oregon into central Idaho tonight
into Wednesday. Idaho county into southwest Montana appears to
have the best chance for snow, but moisture continues to be
limited. The higher terrain of Idaho County is only expected to
receive up to 2 inches of new snow. The Northern Rockies remain
under a cold and active weather pattern through the end of the
work week as subtle features push through the region in
northwesterly flow. A more significant system is anticipated for
the weekend.

&&
Elevations above 4,000 FT:

                      Today        Tonight      Wed
Cloud Cover           65%          80%          35%
Hi/Lo Temps           5 to 16      -15 to -1    10 to 22
Winds(mph)            W  5         SW  4        SW  6G18
Precip Chc            0            0            0
Precip Type           snow         snow         snow
Liquid Amt            0.00         0.00         0.00
Snow Ratio(SLR)       23:1         22:1         23:1
Snow Amt(in)          0            0            0

Snow Level            0            0            0

$$



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