404
FOCN45 CWWG 031200
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CDT WEDNESDAY
SEPTEMBER 3 2025.
ALERTS IN EFFECT...AIR QUALITY WARNINGS FOR PORTIONS OF THE NT,
ALBERTA, AND SASKATCHEWAN.
SYNOPTIC OVERVIEW...THE 00Z UPPER ANALYSES REVEALED A TROUGH FROM
BAFFIN ISLAND TO THE MB/ON BORDER, WITH A RIDGE OVER ALASKA AND A LOW
SPINNING OFF VANCOUVER ISLAND.
THE SURFACE ANALYSIS SHOWS HIGH PRESSURE OVER SASKATCHEWAN AND LOWS
NEAR GREAT SLAVE LAKE AND NEAR CAMBRIDGE BAY.
DISCUSSION...
MB/SK...IT'S A BIT OF A FROSTY MORNING IN PARTS OF EAST-CENTRAL
SASKATCHEWAN UNDER THE HIGH, AND A REPEAT IS POSSIBLE IN PARTS OF
SOUTHEASTERN MANITOBA TONIGHT.
LOOKING AHEAD TO THURSDAY, A LOW PRESSURE SYSTEM WILL DEVELOP IN THE
ARCTIC AND THEN SLIDE SOUTH INTO SOUTHERN SASKATCHEWAN/MANITOBA
THURSDAY. THIS SYSTEM WILL BRING AN AREA OF STEADY RAINFALL ALONG THE
MANITOBA/SASKATCHEWAN BORDER AND INTO SOUTHERN MANITOBA FOR MOST OF
THE DAY ON THURSDAY. RAIN WILL BEGIN IN NORTHERN MB/SK TONIGHT AND
CONTINUE INTO THURSDAY AFTERNOON. EXPECTING 10-25 MM ALONG THE BORDER
BETWEEN THE TWO PROVINCES OVER A 24 HOUR PERIOD. STRONG WINDS WILL
ALSO DEVELOP OVER SOUTHEASTERN SK THURSDAY WITH WINDS GUSTING TO
70 KM/H THURSDAY AFTERNOON.
AB...WARM TEMPERATURES RETURN FOR THE SOUTHERN HALF OF THE PROVINCE
TODAY, WITH HIGHS ABOVE 30 DEGRESS POSSIBLE IN A FEW LOCATIONS.
SMOKE CONTINUES TO LINGER, ALTHOUGH IN LOWER CONCENTRATIONS. AIR
QUALITY IS NOT AS BAD AS PREVIOUS DAYS, BUT AQHI VALUES ARE STILL AT
7 OR ABOVE FOR MUCH OF THE PROVINCE. ADDITIONALLY, WILDFIRE SMOKE IS
NOW COMING FROM SOURCES IN BOTH THE NT AND BC, FURTHER COMPLICATING
THE AIR QUALITY FORECAST. GENERALLY, WE EXPECT INTERMITTENTLY POOR
AIR QUALITY OVER THE NEXT 24-48 HOURS. AIR QUALITY WARNINGS REMAIN
IN PLACE FOR NORTHERN AND WESTERN ALBERTA.
ARCTIC...A LOW MOVING THROUGH THE ARCTIC WILL BRING SOME SCATTERED
SHOWERS AND STRONG NORTHWEST WINDS TO THE SOUTHERN NT TODAY. THIS
NORTHWEST FLOW HAS HELPED TO CLEAR SMOKE OUT OF THE NORTHERN REACHES
OF THE TERRITORIES, PUSHING IT BACK TOWARDS THE SOUTH. AIR QUALITY
WARNINGS REMAIN IN PLACE FOR THE SOUTHERN HALF OF THE NT.
END/CARLSEN/GRIFFITH
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