Snow Avalanche Guidance
Issued by NWS Missoula, MT

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FWUS45 KMSO 181112

Backcountry Forecast for western Montana and north central Idaho
National Weather Service Missoula MT
412 AM MST Thu Jan 18 2018

DISCUSSION: A relatively warm and moist weather system will bring
widespread precipitation to western Montana and central Idaho
today into tonight. Precipitation has already begun over
northwest Montana, and is expected to shift into north central
Idaho and west- central Montana by mid day and then into southwest
Montana tonight. Snow levels will initially start quite high, at
roughly 5000 to 6000 feet, but will lower this evening and
overnight to roughly 3000 feet by Friday morning. Breezy winds
will also accompany this system, initially from the south to
southwest, transitioning to a westerly flow behind the cold front
this evening. Gusts up to 40 mph will be possible for exposed
ridge tops.

Cooler, showery and generally active conditions are expected to
last through the weekend into early next week, with only brief dry
periods. Although it is expected to be an active week for
mountain snow, most of the storms are expected to be light to
moderate in intensity.

Elevations above 4,000 FT:

                      Today        Tonight      Fri
Cloud Cover           95%          90%          80%
Hi/Lo Temps           32 to 40     18 to 25     25 to 33
Winds(mph)            S 22G49      W 15G40      SW 11G24
Precip Chc            100          90           60
Precip Type           sno/fzra     snow         snow
Liquid Amt            0.37         0.22         0.09
Snow Ratio(SLR)       13:1         17:1         18:1
Snow Amt(in)          3-6          3-8          1-3

Snow Level            5500         3000         2000

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