Snow Avalanche Guidance
Issued by NWS Missoula, MT

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FWUS45 KMSO 201132

Backcountry Forecast for western Montana and north central Idaho
National Weather Service Missoula MT
432 AM MST SAT DEC 20 2014

DISCUSSION: A very wet weather disturbance will move through the
Northern Rockies late today through Sunday. Snow levels will
gradually increase to around 6000 feet by Sunday morning. Snow
ratios will be pretty low, around 8 to 1. Snow levels will drop
during the afternoon Sunday back to near 4000 feet.

Ridgetop winds will increase with gusts of 30-40 mph possible at
the highest elevations.

Expect a relatively dry period Monday and Tuesday with little
change in temperatures. Winds aloft will become northwesterly by
mid week, allowing for colder air and relatively high snow ratios
to exist. Snow will not be continuous, however expect fairly
consistent light accumulations each day. Weather models continue
to suggest a significant change to much colder temperatures as
arctic air plunges south from the arctic region.

For the latest information on watches, warnings and advisories, go

Elevations above 4,000 FT:

                      TODAY        TONIGHT      SUN
Cloud Cover           80%          95%          90%
Hi/Lo Temps           30 to 36     28 to 33     33 to 41
Winds(mph)            SW 10G31     SW 14G37     W 18G41
Precip Chc            90           100          90
Precip Type           snow         snow         sno/rain
Liquid Amt            0.07         0.47         0.37
Snow Ratio(SLR)       13:1         12:1         15:1
Snow Amt(in)          1            4-9          3-10

Snow Level            3000         4000         5000

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