321  
FOCN45 CWWG 301900  
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM  
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT FRIDAY  
SEPTEMBER 30 2022.  
 
ALERTS IN EFFECT...FOG ADVISORY FOR PEACE RIVER.  
 
SYNOPTIC OVERVIEW...VERY BROAD UPPER RIDGE OVER THE PRAIRIES WITH  
COMPACT UPPER LOW EMBEDDED IN THE FLOW OVER IDAHO/MONTANA BORDER.  
STEEPER UPPER RIDGE OVER THE WESTERN ARCTIC WITH UPPER TROUGH OVER  
EASTERN ALASKA AND ANOTHER OVER THE EAST INCLUDING BAFFIN ISLAND AND  
HUDSON BAY.  
 
AT THE SURFACE, 992 MB LOW NEAR IQALUIT WITH DETACHED COLD FRONT  
STRETCHING FROM NORTHERN QUEBEC INTO NORTHERN ONTARIO AND A WARM  
FRONT DOWN THE LABRADOR COAST. A RIDGE OF HIGH PRESSURE FOLLOWS  
BEHIND THE AFOREMENTIONED LOW STRETCHING FROM THE ARCTIC ARCHIPELAGO  
SOUTHWARD TO THE NORTHERN PRAIRIES. TO THE WEST, A LOW SITS IN THE  
BEAUFORT SEA WITH A WARM FRONT ARCING SOUTHEASTWARDS INTO NORTHERN  
BC. INVERTED TROUGH IN SOUTHWEST SK.  
 
DISCUSSION...  
 
ARCTIC...LOW NEAR IQALUIT BEING TAKEN OVER BY NEW LOW FORMING IN  
DAVIS STRAIT SHIFTING THE AXIS OF HEAVIEST SNOW TO THE SPINE OF  
BAFFIN ISLAND. SNOWFALL AMOUNTS AT QIKIQTARJUAQ ARE NOT PANNING OUT  
AS EXPECTED WITH VERY LITTLE ACCUMULATION SEEN THIS MORNING AND  
FORECAST AMOUNTS HAVE BEEN REVISED SIGNIFICANTLY DOWNWARD.  
TWO POSSIBLE CULPRITS - EITHER THE SNOWFALL SIGNAL OVER THE HIGHER  
TERRAIN IN THE AREA WAS SMOOTHED INTO THE COMMUNITY, OR SNOWSQUALLS  
IN THE NORTHERLY FLOW HAVE JUST NOT SHOWN UP IN THE AREA YET. THERMAL  
PROFILE DEFINATELY SUPPORTS SNOWSQUALLS OVER THE NEXT 30 HOURS, SO  
WILL KEEP THIS IN MIND MOVING FORWARDS. OTHERWISE LINGERING FLURRIES  
IN SOUTHERN BAFFIN WITH NO SIGNIFICANT ACCUMULATIONS.  
 
MODERATE TO STRONG WINDS CONTINUE OVER THE KIVALLIQ TODAY BETWEEN THE  
EXITING LOW AND APPROACHING RIDGE. WINDS ARE EXPECTED TO MAINTAIN  
50-60 KM/H GUSTING TO 80 UNTIL LATE THIS AFTERNOON.  
 
BEAUFORT SEA SYSTEM MOVES EAST THROUGH SATURDAY, INTO THE EASTERN  
KITIKMEOT AND KIVALLIQ. IT WILL BRING A MIX OF PRECIPITATION AND  
MODERATE TO STRONG WIND GUSTS.  
 
A NEW LOW IS FORECAST TO DEVELOP OVER THE CENTRAL NWT ON SATURDAY  
WITH GUSTY WINDS AND A CHANCE OF HEAVY SNOW OVER THE MACKENZIE DELTA.  
 
PRAIRIES...ABOVE SEASONAL TEMPERATURES CONTINUE.  
 
A LARGE AREA OF DENSE FOG DEVELOPED OVER NORTHWESTERN ALBERTA LAST  
NIGHT. FOG PATCHES ARE EXPECTED OVER MUCH OF ALBERTA AGAIN TONIGHT.  
 
THERE IS A RISK OF FROST OVER CENTRAL REGIONS IN ALBERTA BUT NO FROST  
ADVISORIES ARE EXPECTED TO BE NEEDED FOR TODAY, THE FINAL DAY THEY  
ARE ISSUED FOR THE SEASON.  
 
END/FULTON/GRIFFITH  
 
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