174
FOCN45 CWWG 031900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT WEDNESDAY
SEPTEMBER 3 2025.
ALERTS IN EFFECT...AIR QUALITY WARNINGS FOR PORTIONS OF THE NT,
ALBERTA, AND SASKATCHEWAN.
SYNOPTIC OVERVIEW...THE 12Z 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...FROST APPEARED IN IN PARTS OF EAST-CENTRAL SASKATCHEWAN UNDER
THE HIGH EARLIER THIS MORNING. SOME SITES NEAR HUDSON BAY SK DIPPED
BELOW ZERO FOR 3 HOURS THIS MORNING BUT HAVE SINCE REBOUNDED.
THE HIGH WILL SHIFT EAST TODAY AND SIT OVE SOUTHEASTERN MANITOBA
TONIGHT, BRINGING A RISK OF FORST TO THE REGION 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
80 KM/H THURSDAY AFTERNOON.
AB...WARM TEMPERATURES ARE POSSIBLE THE SOUTHERN HALF OF THE PROVINCE
TODAY, WITH HIGHS ABOVE 30 DEGRESS FORECAST IN A FEW
LOCATIONS. SMOKE HOWEVER MAY DAMPEN TEMPERATURES BELOW THIS
THRESHOLD. COOLER TEMPERATURES ARE EXPECTED ON THURSDAY.
SPEAKING OF SMOKE, SMOKE CONTINUES TO BLANKET A LARGE PORTION OF THE
PROVINCE, WITH VARYING CONCENTRATIONS NOTED. GENERALLY, WE EXPECT
INTERMITTENTLY POOR AIR QUALITY OVER THE NEXT 24-48 HOURS.
AIR QUALITY WARNINGS REMAIN IN PLACE FOR A LARGE PORTION OF THE
PROVINCE AND WILL BE EXPANDED AS NEEDED.
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.
ALL IS QUIET ELSEWHERE.
END/CARLSEN/ZIOLKOWSKI/PIMISKERN
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