263  
FOCN45 CWWG 072000  
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM  
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CST TUESDAY  
FEBRUARY 7 2023.  
 
ALERTS IN EFFECT...EXTREME COLD WARNINGS FOR SEVERAL COMMUNITIES IN  
NUNAVUT. SNOWFALL WARNING FOR GRANDE CACHE AND WHITECOURT.  
 
SYNOPTIC OVERVIEW...ALOFT, A TROUGH FROM ALASKA EXTENDS DOWN THE  
PACIFIC COAST THEN A BROAD UPPER RIDGE ARCS OVER WESTERN CANADA. A  
SHORTWAVE TROUGH NEAR THE NWT/AB/SK BORDER IS FLATTENING THE UPPER  
RIDGE AS IT TRACKS EASTWARD. A DEVELOPING UPPER LOW SITS NORTH OF  
VICTORIA ISLAND. BROAD CYCLONIC FLOW EXISTS OVER THE EASTERN ARCTIC  
WITH A TROUGH EXTENDING SOUTHWARD THROUGH HUDSON BAY AND ONTARIO.  
 
AT THE SURFACE, TWO LOWS ARE OVER THE PACIFIC OCEAN: ONE JUST SOUTH  
OF ALASKA AND ANOTHER JUST WEST OF HAIDA GWAII. RIDGING EXISTS OVER  
BC AND YUKON. A 998 MB LOW SITS EAST OF GREAT SLAVE LAKE. A 996 MB  
LOW EXISTS NORTH OF VICTORIA ISLAND. A WEAK RIDGE OF HIGH PRESSURE  
ALONG THE MANITOBA/ONTARIO BORDER STRETCHES INTO NUNAVUT AND BAFFIN  
ISLAND. A 982 MB LOW IS WEST OF INUKJUAK, QC.  
 
DISCUSSION...  
 
ALBERTA...A LOW MOVING THROUGH THE NORTHERN PRAIRIES AND AN  
ATTENDANT COLD FRONT WILL BRING SOME RAIN SHOWERS AND SNOW FLURRIES  
TO NORTHERN ALBERTA TODAY. THIS EVENING, A LEE LOW WILL SPIN UP,  
BRINGING SNOWFALL TO WEST-CENTRAL ALBERTA. MODEL GUIDANCE IS  
SUGGESTING A NARROW BAND OF HEAVY SNOWFALL SOMEWHERE BETWEEN GRANDE  
CACHE AND WHITECOURT. HOWEVER, THERE IS SOME UNCERTAINTY ABOUT  
EXACTLY WHERE THIS BAND WILL DEVELOP. FOR NOW, SNOWFALL WARNINGS  
HAVE BEEN ISSUED FOR THOSE TWO REGIONS, HOWEVER IT IS POSSIBLE THAT  
THE HEAVIEST SNOW FALLS JUST SOUTH OF GRANDE PRAIRIE. SOME NWP  
GUIDANCE IS ALSO HINTING AT NEAR WARNING AMOUNTS JUST WEST OF  
EDMONTON, ALTHOUGH THIS IS FAR FROM CONSENSUS. IF EITHER OF  
THESE SCENARIOS VERIFY, THE WARNING MAY NEED TO BE EXPANDED.  
 
ON WEDNESDAY, AS THE LOW PUSHES SOUTHEASTWARD, FRESH SNOW AND STRONG  
NORTHWEST WINDS WILL REDUCE VISIBILITIES IN BLOWING SNOW FOR  
SOUTHEASTERN ALBERTA, PARTICULARLY IN AREAS NEAR THE CYPRESS HILLS.  
 
MANITOBA/SASKATCHEWAN...THE LOW EAST OF GREAT SLAVE LAKE WILL  
CONTINUE TO TRACK EASTWARD TODAY ALONG THE 60TH PARALLEL, PUSHING  
ANOTHER SHOT OF SNOW INTO NORTHERN SASKATCHEWAN AND MANITOBA TODAY.  
AMOUNTS WILL BE LESS THAN THE PREVIOUS SYSTEM AND ARE FORECAST TO  
REMAIN SUB-WARNING WITH A GENERAL 2 TO 5 CM OF SNOW EXPECTED BY  
WEDNESDAY MORNING.  
 
THE LOW DEVELOPING OVER SOUTHERN ALBERTA THIS EVENING WILL TRACK  
EASTWARD THROUGH SASKATCHEWAN TONIGHT AND INTO MANITOBA WEDNESDAY.  
THIS SYSTEM WILL PUSH 5 TO 10 CM OF SNOW THROUGH CENTRAL  
SASKATCHEWAN AND MANITOBA. ALONG THE WARM FRONT ASSOCIATED WITH THE  
SYSTEM, SOUNDINGS ARE SHOWING FAVOURABLE PROFILES FOR FREEZING RAIN  
THROUGH CENTRAL AND SOUTHEASTERN SASKATCHEWAN OVERNIGHT TONIGHT AND  
WEDNESDAY MORNING. A SLIGHT RISK OF FREEZING RAIN EXISTS THROUGH  
SOUTHWESTERN MANITOBA AND THE RED RIVER VALLEY ON WEDNESDAY. BEHIND  
THE LOW, NORTHWESTERLY WINDS WITH GUSTS OF 70 TO 80 KM/H DEVELOP IN  
SOUTHWEST SASKATCHEWAN WEDNESDAY AFTERNOON. THIS, WITH FALLING SNOW  
WILL BRING LOCAL BLOWING SNOW AND REDUCED VISIBILITY TO THE AREA.  
 
ARCTIC...VERY COLD TEMPERATURES WILL PERSIST OVER THE EASTERN ARCTIC  
WITH DANGEROUS WIND CHILL VALUES CONTINUING AT TIMES FOR SANIRAJAK.  
EXTREME COLD WARNINGS WILL LIKELY BE ISSUED LATER TODAY FOR ARCTIC  
BAY AND POND INLET AS EXTREME WIND CHILL VALUES ARE EXPECTED TONIGHT.  
 
EXTREME COLD ALSO CONTINUES TO IMPACT THE EASTERN KITIKMEOT. SLIGHT  
MODERATION IS EXPECTED, PARTICULARLY FOR TALOYOAK. HOWEVER IT IS  
POSSIBLE THAT WARNINGS REMAIN IN PLACE FOR THE NEXT FEW MORNINGS FOR  
SOME OF THESE SITES.  
 
END/BILOUS/VAN LOCHEM  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab CANADA Page Main Text Page