Snow Avalanche Guidance
Issued by NWS Missoula, MT

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000
FWUS45 KMSO 211052
SAGMSO

BACKCOUNTRY FORECAST FOR WESTERN MONTANA AND NORTH CENTRAL IDAHO
NATIONAL WEATHER SERVICE MISSOULA MT
352 AM MST SUN DEC 21 2014

DISCUSSION: A WINTER STORM SYSTEM WILL MOVE THROUGH THE NORTHERN
ROCKIES BY THIS EVENING. SNOW LEVELS WILL CHANGE LITTLE TODAY
HOLDING STEADY ANYWHERE FROM 4500-6000 FEET.
SNOW RATIOS WILL BE PRETTY LOW, AROUND 8 TO 1. SNOW LEVELS WILL
DROP DURING THE AFTERNOON SUNDAY BACK TO NEAR 4000 FEET.

EXPECT MAINLY DRY CONDITIONS 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. EXPECT MAINLY SNOW SHOWERS.

WEDENESDAY AND THURSDAY ANOTHER STRONG STORM WILL MOVE THROUGH THE
NORTHERN ROCKIES. SNOW LEVELS WILL FALL TO THE VALLEY FLOORS
WEDNESDAY NIGHT THROUGH THURSDAY. THERE IS SOME CONSIDERABLE
UNCERTAINTY AS TO THE TIMING AND AMOUNT OF SNOW POSSIBLE WITH
THIS SYSTEM. THE MOUNTAINS SHOULD GET A HEALTHY 6-8 INCHES OF
SNOW, MAYBE MORE, DURING THAT 24 HOUR PERIOD BETWEEN WEDNESDAY
EVENING AND THURSDAY.



FOR THE LATEST INFORMATION ON WATCHES, WARNINGS AND ADVISORIES, GO
TO WEATHER.GOV/MISSOULA.

&&
ELEVATIONS ABOVE 4,000 FT:

                      TODAY        TONIGHT      MON
CLOUD COVER           90%          80%          75%
HI/LO TEMPS           32 TO 39     21 TO 29     26 TO 35
WINDS(MPH)            W 22G48      W 16G44      W 12G28
PRECIP CHC            100          70           50
PRECIP TYPE           SNOW         SNO/SHR      SNO/SHR
LIQUID AMT            0.40         0.11         0.06
SNOW RATIO(SLR)       12:1         16:1         18:1
SNOW AMT(IN)          4-9          1-4          1-3

SNOW LEVEL            4500         3500         3000

$$


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