428  
FOCN45 CWWG 262000  
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM  
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CST SUNDAY  
FEBRUARY 26 2017.  
 
ALERTS IN EFFECT... BLIZZARD WARNINGS FOR IQALUIT, KIMMIRUT, CAPE  
DORSET, AND CORAL HARBOUR. LIKELY SOON TO BE EXPANDED IN THE FORM OF  
A WINTER STORM WATCH TO CLYDE RIVER. EXTREME COLD WARNINGS FOR POND  
INLET, ARCTIC BAY, HALL BEACH AND IGLOOLIK. LIKELY TO BE EXPANDED TO  
BAKER LAKE AND NAUJAAT. EXTREME COLD ALSO FOR THE EASTERN KITIKMEOT.  
GALE WARNINGS FOR HUDSON STRAIT, WITH BLIZZARD CONDITIONS MENTIONED  
IN THEIR FORECAST.  
 
DISCUSSION... UPPER AIR ANALYSIS SHOWS ALL OF WESTERN AND CENTRAL  
CANADA UNDER A BROAD UPPER TROUGH WITH THE PRAIRIES IN A COOL  
UNSETTLED NORTHWESTERLY FLOW. UPPER LOW NEAR INUKJUAK WITH A  
STRONGER UPPER LOW CENTERED NEAR DEVON ISLAND.  
 
AT THE SURFACE WEAK, TROUGH FROM ABOUT ESTEVAN TO NORWAY HOUSE WITH A  
RIDGE BUILDING IN ON ITS HEELS - ORIGINATING FROM A BEAUFORT HIGH  
WITH RIDGING THROUGH GREAT SLAVE LAKE AND POKING DOWN THROUGH  
ALBERTA. AT 18Z 978 MB LOW LOCATED 80 NM EAST-SOUTHEAST OF  
PUVIRNITUQ TRACKING NORTHWARD. ITS CENTRAL PRESSURE HAS LIKELY  
BOTTOMED OUT, HOWEVER AN INTENSIFYING 976 MB LOW LOCATED EAST OF  
WABUSH LAKE NL IS ALSO TRACKING NORTHWARD.  
 
WESTERN PRAIRIES... WHAT IS LEFT OF THE IMPULSE THAT TRACKED SOUTH  
ACROSS ALBERTA LAST NIGHT IS STILL PRODUCING LIGHT SNOW IN SOUTHERN  
AB AND SOUTHWESTERN SK. THE RIDGE POKING INTO AB IS CREATING UPSLOPE  
FLOW ALONG THE FOOTHILLS TODAY. SNOWFALL TOTALS WILL REMAIN  
SUB-WARNING IN THE SOUTHWEST FOOTHILLS, WITH AMOUNTS OF 5 TO 10 CM  
EXPECTED.  
 
EASTERN PRAIRIES... DISORGANIZED AREAS OF CLOUD ALONG WITH BITS OF  
LIGHT SNOW ASSOCIATED WITH SEVERAL TRANSITORY WEAK IMPULSES IN THE  
NORTHWESTERLY FLOW ALOFT. SNOWFALL ACCUMULATIONS GENERALLY 2 CM OR  
LESS. BETWEEN IMPULSES MANY AREAS WILL SEE SUNNY BREAKS TODAY. SOME  
EARLY-MORNING FOG PATCHES CONTINUE TO BE POSSIBLE, BUT NOTHING  
SIGNIFICANT OR WIDESPREAD.  
 
WESTERN ARCTIC... GJOA HAVEN EXPERIENCED WIND CHILLS BETWEEN MINUS  
55 AND MINUS 60 THIS MORNING. THESE CONDITIONS ARE LIKELY TO RETURN  
TONIGHT. TALOYOAK AND KUGAARUK WILL ALSO EXPERIENCE WIND CHILLS NEAR  
MINUS 55 OVERNIGHT TONIGHT. MEANWHILE, A WEAK DISTURBANCE WILL TRACK  
THROUGH THE MACKENZIE TODAY AND TONIGHT SPREADING LIGHT SNOW OVER  
WESTERN NWT. AMOUNTS OF 2 TO 4 CM ARE EXPECTED.  
 
EASTERN ARCTIC... 978 MB LOW EAST OF PUVIRNITUQ SHOULD WEAKEN A BIT  
AS IT CONTINUES NORTHWARD, HOWEVER 986 MB LOW EAST OF WABUSH LAKE  
WILL CONTINUE TO INTENSIFY AND MAY BOTTOM OUT IN THE HIGH 950S JUST  
EAST OF BREVOORT ISLAND ON MONDAY AFTERNOON. SNOW HAS SPREAD OVER  
SOUTHERN BAFFIN ISLAND TODAY, WITH WEBCAM IMAGERY AT KIMMIRUT  
SHOWING BLIZZARD CONDITIONS THERE, WHILE CAPE DORSET WEBCAMS SHOW  
NEAR BLIZZARD CONDITIONS. NO FALLING SNOW YET AT CORAL HARBOUR, BUT  
VISIBILITIES TANKED NONETHELESS AND WITH WINDS NOT FORECAST TO EVEN  
BEGIN DIMINISHING UNTIL MONDAY MORNING HAD TO EXTEND THE BLIZZARD  
WARNING TO THEM AS WELL. IQALUIT IS A BIT TRICKY AS THEIR WINDS HAVE  
ONLY RECENTLY SHIFTED TO SOUTHEAST ALONG WITH A QUICK 6 DEGREE RISE  
IN TEMPERATURE. THEY WILL LIKELY HAVE MARGINAL SNOWFALL WARNING  
CRITERIA, BUT BLIZZARD CONDITIONS COULD BE LIMITED BY THE STRENGTH  
OF THE EASTERLIES...WHICH COULD STILL GET QUITE GUSTY BY LATE  
AFTERNOON DEPENDING ON HOW THE INVERSION BREAKS DOWN. IQALUIT ALSO  
BEARS SOME WATCHING IN THE NORTHWESTERLIES MONDAY NIGHT AS THE COLD  
AIR DEEPENS BEHIND THE SYSTEM. PANGNIRTUNG AND QIKIQTARJUAQ SHOULD  
ESCAPE THIS SYSTEM WITH SUB-WARNING CONDITIONS, HOWEVER CLYDE RIVER  
SHOULD HAVE NO PROBLEM GETTING A BARRIER JET SET-UP MONDAY NIGHT  
WITH BLIZZARD CONDITIONS QUITE LIKELY. WINTER STORM WATCH WILL GO  
OUT FOR THEM WITH THE AFTERNOON FORECAST UPDATE. FURTHER NORTH AND  
WEST THE PROBLEM IS EXTREME COLD, WITH SOME BLOWING SNOW TOSSED IN  
FOR GOOD MEASURE, AT LEAST FOR THE MAINLAND. EXPECT EXTREME COLD TO  
PLAGUE SOME AREAS MUCH OF THE UPCOMING WEEK.  
 
END/MELSNESS/VALLEE  
 
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