625
FOCN45 CWWG 281900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT WEDNESDAY MAY
28 2025.
ALERTS IN EFFECT...AIR QUALITY WARNINGS FOR PARTS OF SOUTHEASTERN
MANITOBA AND NORTHERN SASKATCHEWAN. SPECIAL AIR QUALITY STATEMENTS
FOR MUCH OF MANITOBA. HEAT WARNING FOR MUCH OF ALBERTA.
SYNOPTIC OVERVIEW...UPPER AIR ANALYSIS REVEALS A UPPER LOW OVER THE
GULF OF ALASKA WITH TROUGH SOUTHWARD AND A BROAD UPPER RIDGE OVER THE
WESTERN PRAIRIES. AN UPPER LOW LIES OVER MINNESOTA. OVER THE ARCTIC,
ZONAL FLOW TOPS THE RIDGE WITH A FEW EMBEDDED SHORTWAVE TROUGHS.
AT THE SURFACE, A SPRAWLING AREA OF HIGH PRESSURE LIES OVER ONTARIO
AND ACROSS THE SOUTHERN PRAIRIES, INCLUDING BC. A 1000 MB LOW
LIES OVER NORTHERN HUDSON BAY NEAR SOUTHAMPTON ISLAND ALONG A
BAROCLINIC ZONE THAT TIES BACK UP TO A SECOND LOW CENTRE VC BANKS
ISLAND.
DISCUSSION...
AB/NT...29C HIGHS ARE EXPECTED OVER NORTHERN ALBERTA TODAY. CENTRAL
AND SOUTHERN AREAS OF ALBERTA AND THE SOUTHERN NT WILL REACH THE
HIGH 20S. TOMORROW WILL BE SEVERAL DEGREES WARMER. A COLD FRONT,
SIMILAR TO MONDAY, WILL SWEEP EASTWARD ON THURSDAY BRINGING A
RISK OF SEVERE THUNDERSTORMS.
A FEW FIRES IN AB AND NE BC ARE BRINGING SOME LOCALLY POOR AIR
QUALITY TO A FEW AREAS, BUT NOTHING LOOKS BAD ENOUGH YET TO REQUIRE
ANY ALERTS.
SK/MB...UPPER RIDGING CONTINUES TO DOMINATE BOTH SASKATCHEWAN AND
MANITOBA THIS WEEK, LEADING TO WARM, DRY CONDITIONS WHICH HAVE
FUELLED FOREST FIRE ACTIVITY. WILDFIRES EJECTED MASS AMOUNTS OF SMOKE
INTO PARTS OF THE NORTHERN SASKATCHEWAN AND MANITOBA OVER THE PAST
FEW DAYS AND THESE CONDITIONS LOOK TO CONTINUE FOR THE REMAINDER OF
THE WEEK. THE COLD FRONT MOVING THROUGH NORTHERN MANITOBA TODAY WILL
SHIFT WINDS AND PUSH SMOKE TO THE SOUTHEAST UNTIL THURSDAY MORNING
WHEN A SOUTHERLY FLOW RETURNS.
PARTS OF WESTERN SASKATCHEWAN WILL FLIRT WITH HEAT WARNING CRITERIA
OVER THE COMING DAYS. THIS HEAT WILL MOVE EASTWARD THROUGH THE WEEK,
LYING OVER MANITOBA LATE WEEK INTO THE WEEKEND. WHILE DAYTIME HIGHS
WILL BE CLOSE TO HEAT WARNING CRITERIA, OVERNIGHT LOWS LOOK TO DIP A
FEW DEGREES BELOW CRITERIA SO WIDESPREAD HEAT WARNINGS ARE NOT
EXPECTED AT PRESENT TIME.
FURTHER EAST, A WEAK UPPER VORT MAX WILL GIVE A VERY SLIGHT CHANCE OF
AN ISOLATED SHOWER OR THUNDERSHOWER THIS AFTERNOON OVER EXTREME
SOUTHEASTERN MANITOBA. AS WAS OBSERVED ON TUESDAY, THERE IS LITTLE
INSTABILITY OR SHEAR TO WORK WITH AND ANY PRECIPITATION THAT DOES
DEVELOP WILL BE VERY ISOLATED AND WON'T AMOUNT TO MUCH.
NU...THE LOW PRESSURE SYSTEM NEAR SOUTHAMPTON ISLAND GAVE RAIN, FZRA
AND SNOW TO CORAL HARBOUR LAST NIGHT. PRECIPITATION WAS FALLING
THROUGH A FAIRLY DEEP ABOVE FREEZING LAYER WITH SURFACE TEMPERATURES
NEAR ZERO SO PRECIPITATION MOSTLY FELL AS RAIN, HOWEVER A SHORT FUSE
FZRA WARNING WAS ISSUED LATE LAST NIGHT FOR THE COMMUNITY.
WILL LIKELY SEE A TRANSITION TO SNOW WEDNESDAY MORNING ON THE
BACKSIDE WITH A FEW QUICK CM'S OF ACCUMULATION BEFORE THE SYSTEM
PULLS OFF ON WEDNESDAY EVENING INTO NORTHERN QUEBEC.
A LOW PRESSURE SYSTEM APPROACHING RESOLUTE MAY PRODUCE SOME FREEZING
RAIN THERE OVERNIGHT AND THURSDAY MORNING. SURFACE TEMPERATURES WILL
BE NEAR ZERO SO THE IMPACT IS EXPECTED TO BE MINIMAL.
END/DYKES/STAMMERS/STAUNTON
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