Snow Avalanche Guidance
Issued by NWS Missoula, MT

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771
FWUS45 KMSO 171039
SAGMSO

Backcountry Forecast for western Montana and north central Idaho
National Weather Service Missoula MT
339 AM MST Sat Feb 17 2018

...Significant Snow and Wind Begins this Weekend...

DISCUSSION:
Light to moderate wet, dense snowfall will begin to intensify
today into tonight across northwest Montana. Snow levels will
initially be at valley floors, raising potentially as high as
3500-4500 feet by this afternoon/evening before dropping back down
again by tonight. Winds will initially be strong and gusty from
the west and south today. However, as an arctic air mass pushes
into western Montana tonight into Sunday morning, winds will shift
and become gusty from the north and east. Snow will transition to
a lighter density due to the colder airmass, but will still be
widespread through the rest of the weekend. Significant snowfall
amounts are expected during the next 48 hours, particularly north
of I-90 where snow levels will remain lower and snowfall
enhancement will be favored.

&&
Elevations above 4,000 FT:

                      Today        Tonight      Sun
Cloud Cover           100%         95%          90%
Hi/Lo Temps           20 to 38     -7 to 18     1 to 27
Winds(mph)            SW 16G44     N 21G48      NE 17G36
Precip Chc            100          100          90
Precip Type           snow         snow         snow
Liquid Amt            0.54         0.51         0.17
Snow Ratio(SLR)       19:1         21:1         23:1
Snow Amt(in)          9-13         9-13         3-6

Snow Level            1000         1000         500

$$



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