546
FOCN45 CWWG 202000
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CST THURSDAY
FEBRUARY 20 2025.
ALERTS IN EFFECT...NONE AT THIS TIME.
SYNOPTIC OVERVIEW...ALOFT, AN UPPER LOW IS OVER SOUTHERN YUKON WITH
TROUGHING SOUTHWARD THROUGH BC AND INTO THE WESTERN US. A SHORTWAVE
IS IN THE BASE OF THE TROUGH, OVER COLORADO. RIDGING IS OVER AB AND
SK AND EXTENDS INTO NWT. AN UPPER LOW IS OVER THE HIGH ARCTIC WITH
STRONG FLOW AROUND THE LOW. SLACK FLOW ACROSS THE EASTERN ARCTIC AND
EASTERN PRAIRIES.
AT THE SURFACE, A DEVELOPING LOW IS NEAR GREAT SLAVE LAKE WITH
TROUGHING SOUTHWARD THROUGH WESTERN ALBERTA. OTHERWISE, ARCTIC HIGH
PRESSURE DOMINATES THE LANDSCAPE, ANCHORED BY A 1047 MB CENTRE
HUGGING THE MB/ND BORDER. RIDGE FROM SAID HIGH STRETCHES NORTHWARD,
THROUGH MAINLAND NUNAVUT AND UP TO NORTHERN BAFFIN ISLAND.
DISCUSSION...
AB...THE REMAINING EXTREME COLD WARNINGS HAVE ENDED! WARMER AIR
FROM THE PACIFIC HAS ALREADY BEGUN TO INFLUENCE TEMPERATURES OVER
WEST-CENTRAL ALBERTA AND ALONG THE ROCKIES AND WILL CONTINUE TO DO SO
IN THE COMING DAYS.
OVER NORTHEASTERN ALBERTA, LIGHT SNOW CONTINUES BUT WILL END THIS
AFTERNOON AS THE SYSTEM NEAR GREAT SLAVE LAKE PUSHES EAST. MINIMAL
ACCUMULATIONS ARE EXPECTED (0-2 CM).
SK/MB...FINALLY, AN END. EXTREME COLD WARNINGS WERE ENDED THIS
MORNING. TEMPERATURES WILL CONTINUE TO MODERATE AS A MILD PUSH OF
PACIFIC AIR WILL PRODUCE A WARM UP FOR ALL COME FRIDAY, WITH A PERIOD
OF ABOVE SEASONAL TEMPS ON TAP FOR THE WEEKEND AND BEYOND.
AFOREMENTIONED SNOW IN AB WILL SLIDE INTO NORTHERN SK THIS AFTERNOON.
MINIMAL ACCUMULATIONS ARE EXPECTED.
NT...LOW CENTRED NEAR GREAT SLAVE LAKE WILL TRUNDLE EASTWARD TODAY,
GIVING SNOW TO THE GSL AREA AND COMMUNITIES ALONG THE MACKENZIE
RIVER. SNOWFALL AMOUNTS WILL GENERALLY BE 2-5 CM TODAY.
IN THE ISR, A COUPLE CM OF SNOW CAN BE EXPECTED TODAY FOR THE COASTAL
COMMUNITIES AS A WEAK SYSTEM TRAVERSES THE REGION.
NU...A NORTHWESTERLY GRADIENT PRODUCING GUSTS OF 50 TO 60 KM/H WILL
PRODUCE BLOWING SNOW AT TIMES IN IQALUIT AND CLYDE RIVER, AS WELL AS
AREAS OVER THE EASTERN KITIKMEOT.
END/CARLSEN/MOODIE/PIMISKERN
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