510  
FOCN45 CWWG 201300  
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM  
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CST TUESDAY  
FEBRUARY 20 2018.  
 
ALERTS IN EFFECT...EXTREME COLD WARNINGS FOR POND INLET, PORTIONS OF  
THE KIVALLIQ, KITIKMEOT, NWT, NRN SK, NRN AB, AND SE AB. BLIZZARD  
WARNINGS IN HALL BEACH AND IGLOOLIK. BLOWING SNOW ADVISORY FOR  
NORMAN WELLS.  
 
SYNOPTIC OVERVIEW...MAJOR FEATURES THIS MORNING ARE THE 999 MB POLAR  
VORTEX SOUTH OF BAFFIN ISLAND, THE SLOW MOVING 1015 MB STACKED LOW  
NEAR LYNN LAKE, AND A MASSIVE UPPER RIDGE PUSHING AGAINST THE WEST  
COAST OF NORTH AMERICA.  
 
DISCUSSION...  
 
EASTERN ARCTIC...EXTREME COLD CONTINUES IN THE SOUTHERN KIVALLIQ  
THIS MORNING. TEMPERATURES REMAIN IN THE -35 TO -40 RANGE WITH  
NORTHWEST WINDS NEAR 20 KM/H GIVING WIND CHILL VALUES NEAR -50.  
SLIGHT REDUCTION IN WINDCHILL IS FORECAST THROUGH THE DAY  
WHICH MAY RESULT IN WARNINGS BEING ENEDED. IF SO, THEY WILL LIKELY  
BE REISSUED FOR TONIGHT. OVER THE NEXT 3 DAYS THE COLD AIR WILL  
GRADUALLY DRIFT NORTHEASTWARD. AS A RESULT, WARNINGS ARE LIKELY TO  
BE EXPANDED INTO CORAL HARBOUR, REPULSE BAY, AND MAYBE EVEN LOCALES  
IN SOUTHERN BAFFIN ISLAND WHILE THEY ARE ENDED FROM THE SOUTH IN THE  
KIVALLIQ. POND INLET IS ALSO EXTREMELY COLD THIS MORNING WITH WIND  
CHILL VALUES HOVERING AROUND THE -50 MARK. ELSEWHERE, THE BLIZZARD  
DEVELOPED IN HALL BEACH AS FORECAST, AND IS EXPECTED TO END EARLY  
THIS EVENING. CLYDE RIVER AS WELL IS EXPERIENCING BLIZZARD  
CONDITIONS, HOWEVER THE 6 HOUR CRITERIA IS NOT FORECAST TO BE MET  
VISIBILITIES ARE EXPECTED TO IMPROVE IN THE COMING FEW HOURS.  
 
EASTERN PRAIRIES...EXTREME COLD WARNINGS WERE ENDED IN NORTHERN  
MANITOBA AS CLOUD ASSOCIATED WITH THE LOW CAUSED TEMPERATURES TO  
REMAIN A BIT WARMER OVERNIGHT THAN FORECAST. COLD WILL ONCE AGAIN BE  
A CONCERN FOR EAST CENTRAL SK TONIGHT AS WIND CHILL VALUES APPROACH  
THE -40 MARK.  
 
OTHERWISE, NORTHERN MANITOBA WILL SEE A SKIFF OF LIGHT SNOW TODAY  
ASSOCIATED WITH THE WEAK LOW. WHILE THE SOUTHEASTERN  
CORNER OF THE PROVINCE IS SEEING SOME LIGHT SNOW AS A SIGNIFICANT  
WINTER STORM MOVES THROUGH MINNESOTA AND INTO NORTHERN ONTARIO  
TODAY. ACCUMULATIONS WHILE GENERALLY REMAIN UNDER 2 CM.  
 
KITIKMEOT...EXTREME COLD WARNING CONTINUES IN TALOYOAK AND GJOA  
HAVEN WITH WIND CHILL VALUES NEAR MINUS 55. LOOKS LIKE THESE REGIONS  
COULD HAVE EXTREME COLD CONDITIONS OFF AND ON THROUGH THE WEEK ONCE  
AGAIN. KUGAARUK MAY SEE SOME SWLY WINDS OF 40 KM/H GUSTING TO 60  
TODAY. THESE WINDS COULD PRODUCE SOME BLOWING SNOW  
AS WELL AS EXTREME COLD CONDITIONS. THIS AFTERNOON A LOW DEVELOPS  
NEAR THE MACKENZIE DELTA AND TRACKS SOUTHEASTWARDS. SOME INSTABILITY  
COULD GIVE ISOLATED POCKETS OVER 10 CM BUT GENERALLY LOOKING IN  
THE 5 TO 10 RANGE. STRONG GRADIENT BEHIND THE LOW WILL GIVE 50G70  
KM/H WINDS TO NORMAN WELLS AND FORT GOOD HOPE AND SOME BLOWING SNOW.  
WITH CLIMATE STATISTICS FAVORING VSBYS AROUND 1/2 SATUTE MILE OVER  
NORMAN WELLS FOR OVERNIGHT, WE HAVE ISSUED A BLOWING SNOW ADVISORY  
FOR THAT REGION.  
 
OVER EXTREME NORTHERN SASKATCHEWAN AND NORTHEAST ALBERTA THE SURFACE  
RIDGE BEHIND THE LOW NEAR FORT SMITH IS GIVING EXTREME COLD WIND  
CHILLS. ELSEWHERE UNDER CLEAR SKIES SOUTHERN ALBERTA ALSO SAW WIND  
CHILLS DROP INTO THE MINUS 40S LAST NIGHT. VALUES OVER MOST AREAS  
SHOULD RECOVER THIS AFTERNOON.  
 
END/VAN WILGENBURG/YUN  
 
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