885  
FOCN45 CWWG 192000  
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM  
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CST TUESDAY  
NOVEMBER 19 2019.  
 
ALERTS IN EFFECT...BLIZZARD WARNING FOR ARVIAT, WHALE COVE, AND  
ARVIAT. SNOWFALL WARNING FOR PORTIONS OF SOUTHERN ALBERTA AND  
SOUTHERN SASKATCHEWAN.  
 
SYNOPTIC OVERVIEW...STRONG UPPER LOW MOVING INTO SW ALASKA. UPPER  
RIDGE OVER THE EASTERN PACIFIC. UPPER LOW MOVING ACROSS IDAHO, WITH  
TROUGH TO THE SOUTHWEST. UPPER TROUGH ON THE NT/NU BORDER AND ACROSS  
MANITOBA. THE 18Z SURFACE ANALYSIS SHOWED A WEAK LOW OVER  
NORTH-CENTRAL MANITOBA, LOW PRESSURE OVER WESTERN MONTANA, AND HIGH  
PRESSURE OVER MOST OF THE ARCTIC.  
 
DISCUSSION...  
 
PRAIRIES...THE MONTANA LOW AND ASSOCIATED UPPER TROUGH IS PRODUCING  
SNOW OVER SOUTHERN ALBERTA TODAY. SO FAR, AS MUCH AS 11 CM HAS BEEN  
REPORTED IN WEST CALGARY; 8 CM AND COUNTING AT THE AIRPORT. TOTAL  
ACCUMULATIONS OF 10-15 CM ARE EXPECTED OVER PORTIONS OF SOUTHERN  
ALBERTA BEFORE SNOW ENDS BY WEDNESDAY MORNING.  
 
THE SAME SYSTEM WILL IMPACT SOUTHERNMOST PARTS OF SASKATCHEWAN AND  
MANITOBA TONIGHT AND WEDNESDAY. WARNING-LEVEL SNOW IS EXPECTED IN  
PARTS OF SASKATCHEWAN WITHIN ABOUT 100 KM OF THE INTERNATIONAL  
BORDER FROM THE CYPRESS HILLS TO ESTEVAN.  
 
ARCTIC...NORTH-CENTRAL MANITOBA LOW WILL INTENSIFY AS IT PUSHES INTO  
SOUTHWEST HUDSON BAY, WITH COLD AIR INJECTING INTO THE SYSTEM FROM  
THE HIGH OVER THE ARCTIC. AS A RESULT, SNOW AND BLOWING SNOW WILL  
IMPACT COASTAL AREAS BETWEEN CHURCHILL AND CHESTERFIELD INLET WITH  
THE WORST CONDITIONS LIKELY FROM ARVIAT TO RANKIN INLET, WHERE A  
BLIZZARD WARNING HAS BEEN ISSUED. ELSEWHERE RELATIVELY QUIET  
CONDITIONS ARE IN STORE.  
 
A WEAK SYSTEM IS PASSING THROUGH THE MACKENZIE VALLEY THIS AFTERNOON  
GIVING 2-5 CM OF SNOW. OTHERWISE, THERE WILL BE PATCHY STRATUS WITH  
A FEW ISOLATED FLURRIES. WEDNESDAY MORNING, THE STRONG SYSTEM FROM  
ALASKA WILL MOVE THROUGH THE MACKENZIE DELTA GIVING 5-10 CM OF SNOW  
TO SOME LOCATIONS BY THURSDAY MORNING. AS THE SYSTEM TRACKS EAST,  
STRONG WINDS WILL AFFECT MOST COASTAL SITES IN THE NWT AND INTO THE  
KITIKMEOT BY WEDNESDAY AFTERNOON GIVING BLOWING SNOW. LOCALIZED  
BLIZZARD CONDITIONS MAY BE POSSIBLE.  
 
END/CARLSEN/ROMBOUGH  
 
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