059  
FWUS45 KMSO 171057  
SAGMSO  
 
BACKCOUNTRY FORECAST FOR WESTERN MONTANA AND NORTH CENTRAL IDAHO  
NATIONAL WEATHER SERVICE MISSOULA MT  
357 AM MST SUN FEB 17 2019  
 
DISCUSSION: A MOISTURE STARVED MODIFIED ARCTIC COLD FRONT HAS  
PROGRESSED WELL INTO MONTANA OVERNIGHT. THUS SNOWFALL HAS BEEN  
MORE LIMITED AND RATHER LOCALIZED WITH THE MISSION, SWAN AND  
FLATHEAD RANGES LIKELY RECEIVING THE LIONS SHARE OF MOUNTAIN  
ACCUMULATIONS. HOWEVER THE GUSTY EAST WINDS HAVE ALSO  
MATERIALIZED IN FULL FORCE THROUGHOUT THESE AREAS, LEADING TO  
WIDESPREAD BLOWING AND DRIFTING OF SNOW ALONG WITH LIMITED  
VISIBILITY THAT WILL CONTINUE WELL INTO TODAY.  
 
THIS EVENING THE GREATEST THREAT THROUGHOUT THE BACKCOUNTRY WILL  
TRANSITION TO COLD TEMPERATURES AND DANGEROUSLY COLD WIND CHILL  
READINGS. DECREASING CLOUDS AND WINDS GRADUALLY CALMING DOWN ARE  
BOTH EXPECTED MONDAY WHICH WILL LEAD TO A PERIOD OF OPTIMAL  
RADIATIONAL COOLING AND EXTREMELY COLD LOW TEMPERATURES ON  
TUESDAY MORNING.  
 

 
ELEVATIONS ABOVE 4,000 FT:  
 
TODAY TONIGHT MON  
CLOUD COVER 85% 65% 35%  
HI/LO TEMPS 4 TO 22 -23 TO 2 7 TO 18  
WINDS(MPH) NE 17G40 NE 15G31 NE 7G21  
PRECIP CHC 50 10 0  
PRECIP TYPE SNOW SNOW SNO/SHR  
LIQUID AMT 0.03 0.01 0.00  
SNOW RATIO(SLR) 20:1 20:1 20:1  
SNOW AMT(IN) 0-2 0-2 0  
 
SNOW LEVEL 0 0 0  
 

 
 
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