555  
FOCN45 CWWG 221200  
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM  
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CDT FRIDAY OCTOBER  
22 2021.  
 
ALERTS IN EFFECT...NONE AT THIS TIME.  
 
SYNOPTIC OVERVIEW...ALOFT, AN UPPER TROUGH SWINGS INTO CENTRAL BC  
WHILE A RIDGE OF HIGH PRESSURE STRETCHES FROM AB TO A QS HIGH CENTRE  
ALONG THE SOUTHERN NWT/NU BORDER. FROM THERE, RIDGING EXISTS OVER  
MOST OF THE MAINLAND ARCTIC. AN UPPER LOW IS SITUATED OVER JAMES BAY.  
 
AT THE SURFACE, A DEEP LOW PRESSURE SYSTEM SITS OFF THE NORTHERN TIP  
OF HAIDA GWAII. MINOR TROUGHING OVER THE NORTHERN MACKENZIE, VISCOUNT  
MELVILLE SOUND AND IN THE LEE OF THE AB ROCKIES. HIGH PRESSURE  
DOMINATES THE LANDSCAPE OVER THE EASTERN PRAIRIES AND EASTERN ARCTIC.  
WEAK LOW IN THE VC OF JAMES BAY.  
 
DISCUSSION...  
 
EASTERN PRAIRIES...PRECIP TYPING CONTINUES TO BE THE NAME OF THE GAME  
IN THE STRATUS DECK AS IT CONTINUES THE SOUTHERLY TREK FROM NORTHERN  
AND CENTRAL MB TO SOUTHERN SECTIONS TODAY. LIGHT ACCUMULATIONS  
EXPECTED THROUGH THE PERIOD.  
 
WESTERN PRAIRIES...THE UPPER TROUGH CURRENTLY SITUATED OVER BC WILL  
MOVE INTO ALBERTA LATER TODAY GENERATING A LEE LOW AND WIDESPREAD  
PRECIPITATION THAT WILL AFFECT MUCH OF THE PROVINCE TONIGHT INTO  
SATURDAY. THE MODELS, WHICH WERE PREVIOUSLY IN DISAGREEMENT OVER  
PLACEMENT AND AMOUNTS, HAVE SINCE COME SOMEWHAT IN LINE WITH ONE  
ANOTHER WITH THE LATEST MODEL RUNS. IN TOTAL, A SWATH OF 5-15 MM  
CAN BE EXPECTED BY SATURDAY EVENING.  
 
EASTERN ARCTIC...NIL SIG WX.  
 
WESTERN ARCTIC...NIL SIG WX.  
 
END/DYKES/PIMISKERN  
 
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