387  
FOCN45 CWWG 071900  
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM  
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT TUESDAY APRIL  
7 2020.  
 
ALERTS IN EFFECT...SNOWFALL WARNING FOR THE NORTHWEST CORNER OF  
MANITOBA. SUMMARY WEATHER BULLETIN FOR YESTERDAY'S SNOWFALL IN  
SOUTHERN SASKATCHEWAN AND SOON TO BE ISSUED FOR NORTHERN MANITOBA'S  
RECENT SNOWFALL.  
 
SYNOPTIC OVERVIEW...OMEGA BLOCK OVER CENTRAL AND EASTERN CANADA WITH  
UPPER LOW IN NORTHERN SASKATCHEWAN, HIGH CENTERED OVER HALL BEACH,  
AND LOW IN LABRADOR. MAIN SOUTHERN STREAM JET RUNS FROM THE NORTHERN  
GULF OF ALASKA THROUGH SOUTHERN ALBERTA AND ACROSS NORTHERN  
MINNESOTA.  
 
AT THE SURFACE, HIGH PRESSURE CONTINUES TO DOMINATE THE CENTRAL  
ARCTIC, ALTHOUGH THE CENTRAL PRESSURE IS SLOWLY DROPPING, NOW AT 1024  
MB, DOWN CONSIDERABLY FROM THE 1069 RECORDED SEVERAL DAYS AGO, BUT IN  
ALMOST THE EXACT SAME LOCATION JUST WEST OF HALL BEACH. 999 MB LOW  
JUST NORTH OF THOMPSON TRACKING NORTHEASTWARD AND STARTING TO WEAKEN.  
1002 MB LOW IN WISCONSIN WITH COLD FRONT WESTWARD THROUGH THE  
NORTHWESTERN CONUS. 991 MB LOW WAY UP IN THE ARCTIC OCEAN NORTHWEST  
OF MOULD BAY. 1006 MB LOW IN THE NORTHWESTERN GULF OF ALASKA AND  
DEEPENING RATHER QUICKLY.  
 
DISCUSSION...SOUTHERN AND WESTERN PRAIRIES...RATHER STEEP LAPSE RATES  
SETTING UP AS COLD AIR ALOFT COMBINES WITH STRONG SPRING SUNSHINE  
RESULTING IN CONVECTIVE PRECIPITATION. FLURRIES, SHOWERS, OR MIXED  
PRECIPITATION IS POSSIBLE IN THE AFTERNOON AND EARLY EVENING WITH THE  
ODD WEAK THUNDERSTORM NOT BEING RULED OUT. ADD TO THIS WINDS GUSTING  
AT TIMES TO 60 OR 70 KM/H. FINALLY BY THURSDAY A HIGH PRESSURE RIDGE  
WILL BRING A TEMPORARY REPRIEVE - ONLY TO BE FOLLOWED BY THE NEXT LOW  
WHICH IS CURRENTLY TRACKING INTO THE NORTHERN GULF OF ALASKA AND IS  
FORECAST TO TAKE A SOUTHEASTWARD DIVE ACROSS THE PRAIRIES LATER IN  
THE WEEK.  
 
NORTHERN MANITOBA AND NORTHEASTERN SASKATCHEWAN...SNOW ALONG A LOW  
PRESSURE TROUGH WILL GRADUALLY WEAKEN AND SHIFT EASTWARD TOWARDS THE  
HUDSON BAY COAST OVER THE NEXT DAY OR SO. EXPECT THE SNOWFALL WARNING  
FOR BROCHET TO END LATER TODAY.  
 
EASTERN ARCTIC...LARGE HIGH CONTINUES TO DOMINATE WEATHER PATTERN  
RESULTING IN NIL SIG WX.  
 
WESTERN ARCTIC...A TROUGH EXTENDING FROM THE LOW PRESSURE SYSTEM IN  
MANITOBA IS BRINGING SNOW TO THE EASTERN ARM OF GREAT SLAVE LAKE.  
LUTSEL K'E IS EXPECTED TO SEE 2-4 CM OF SNOW TODAY AND 5-10 CM OF  
SNOW TONIGHT BEFORE THE TROUGH MOVES OFF WEDNESDAY MORNING.  
 
A WEAK SYSTEM IS ALSO MOVING THROUGH THE AMUNDSEN GULF TODAY BRINGING  
SOME SNOW TO THE COASTAL COMMUNITIES. 2 CM IS EXPECTED FOR PAULATUK  
AND SACHS HARBOR TODAY. OTHERWISE NIL SIG WX FOR THE REST OF THE NWT  
WITH SCATTERED CLOUDS WITH A FEW FLURRIES UNTIL THE NEXT SYSTEM MOVES  
INTO THE SOUTHERN MACKENZIE WEDNESDAY NIGHT.  
 
END/MELSNESS/STANFEL  
 
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