501
FOCN45 CWWG 192000
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CST WEDNESDAY
FEBRUARY 19 2025.
ALERTS IN EFFECT...EXTREME COLD WARNINGS FOR MOST OF ALBERTA,
SASKATCHEWAN AND SOUTHERN MANITOBA.
SYNOPTIC OVERVIEW...ALOFT, AN UPPER LOW IS OVER THE GULF OF ALASKA
WITH TROUGHING SOUTHWARD THROUGH THE EASTERN PACIFIC. A SHORTWAVE IS
IN THE BASE OF THE TROUGH, OFF THE COAST OF THE PACIFIC NORTHWEST.
RIDGING IS OVER BC AND EXTENDS INTO YUKON AND ALASKA. AN UPPER LOW
IS OVER THE ARCTIC OCEAN WITH STRONG SOUTHWESTERLY FLOW ACROSS THE
HIGH ARCTIC. SLACK FLOW ACROSS THE EASTERN ARCTIC AND EASTERN
PRAIRIES.
AT THE SURFACE, A TROUGH CONTINUES TO HOVER OVER THE MACKENZIE RIVER
VALLEY. OTHERWISE, ARCTIC HIGH PRESSURE DOMINATES THE LANDSCAPE,
ANCHORED BY A CENTRE HUGGING THE SK/MB/ND BORDER. RIDGE FROM SAID
HIGH STRETCHES NORTHWARD, THROUGH MAINLAND NUNAVUT AND UP TO ALERT.
DISCUSSION...
AB...EXTREME COLD WARNINGS REMAIN IN PLACE FOR MUCH OF ALBERTA,
ROUGHLY THE EASTERN TWO-THIRDS OF THE PROVINCE. THIS WARNING WILL
LIKELY BE PARED BACK ALONG THE WESTERN MARGIN LATER TODAY, BUT ONE
MORE NIGHT OF NEAR -40 WIND CHILL IS POSSIBLE SPECIFICALLY FOR
EASTERN REGIONS TONIGHT.
MEANWHILE A WARMING TREND WILL BEGIN BY THURSDAY IN WESTERN ALBERTA,
WITH HIGH TEMPERATURES WELL ABOVE ZERO EXPECTED FOR MUCH OF THE
PROVINCE ON THE WEEKEND.
IN SOUTHERN ALBERTA, SOME TERRAIN ENHANCED SOUTHEASTERLY WINDS
WITH GUSTS NEARING 60 KM/H ARE PRODUCING SOME LOCAL BLOWING SNOW,
ESPECIALLY IN THE CORRIDOR FROM THE INTERNATIONAL BORDER AT COUTTS
TOWARDS RAYMOND. THESE CONDITIONS SHOULD IMPROVE LATER THIS
AFTERNOON.
OVER NORTHERN ALBERTA, SOME LIGHT SNOW IS EXPECTED BEGINNING EARLY
MORNING ON THURSDAY IN THE NORTHWEST, AND ARRIVING IN THE NORTHEAST
BY MID DAY. JUST A COUPLE CM OF SNOW IS EXPECTED WITH THIS
SYSTEM, WITH THE BULK OF THE SNOW FALLING IN THE NT.
SK/MB...THE ARCTIC RIDGE THAT HAS PLAGUED THE REGION OVER THE PAST
FEW DAYS IS SHOWING SOME SEMBLANCE OF MOVING SOUTHEASTWARDS OVER THE
NEXT 24 HOURS. EXTREME COLD WARNINGS REMAIN IN PLACE FOR MANY IN THE
SOUTH, BUT THIS WILL BEGIN TO CHANGE COME THURSDAY MORNING AS
(RELATIVELY) WARMER AIR INVADES FROM THE WEST. 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.
NT...IMPULSE APPROACHING FROM THE PACIFIC COAST WILL LEAD TO
CYCLOGENESIS ATOP THE INCOMING UPPER RIDGE OVER WESTERN CANADA.
SNOW WILL BREAK OUT ACROSS THE MACKENZIE VALLEY ON THURSDAY WITH A
GENERAL 5-10 CM EXPECTED IN 24 HOURS ACROSS A LARGE SWATH EXTENDING
FROM GREAT SLAVE LAKE TOWARD NORMAN WELLS.
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 TODAY.
END/DYKES/MOODIE/GREENHOUGH
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page