Snow Avalanche Guidance
Issued by NWS Missoula, MT

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FWUS45 KMSO 231201
SAGMSO

Backcountry Forecast for western Montana and north central Idaho
National Weather Service Missoula MT
501 AM MST Fri Feb 23 2018

DISCUSSION:

The first in a series of weather systems to bring snow to the
Northern Rockies will be wrapping up this morning over the
Bitterroot Range, with accumulations generally less than 3 inches
across north central Idaho and southwest Montana.

The second weather system will concentrate light to moderate snow
at mountain pass elevations and higher along the ID/MT border
Saturday morning through late Saturday evening. Snow accumulations
6 to 10 inches for passes and high terrain will be common.

The third weather system overhead Sunday morning through Monday
morning will be accompanied by a relatively strong Pacific
moisture surge. This third system is anticipated to produce the
most significant high elevation snowfall for most mountain ranges
(8 to 12 inches for Cabinet, Clearwater, Bitterroot Ranges). Wind
may be a complicating factor as well, with relatively cold air
following the snowfall. Also, wind over passes along the
Continental Divide may decrease visibility at times in blowing
snow.

Continued weather systems every 2 to 3 days are anticipated to
move over the region through the following weekend. Snow amounts
for each of these systems appear fairly modest, but the increasing
sun angle should moderate temperatures over time.

&&
Elevations above 4,000 FT:

                      Today        Tonight      Sat
Cloud Cover           40%          75%          75%
Hi/Lo Temps           12 to 23     4 to 12      17 to 28
Winds(mph)            W 10G25      SW 12G28     SW 10G23
Precip Chc            0            60           80
Precip Type           snow         snow         snow
Liquid Amt            0.00         0.09         0.11
Snow Ratio(SLR)       21:1         21:1         21:1
Snow Amt(in)          0            2-4          2-4

Snow Level            0            0            500

$$



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