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FOCN45 CWWG 301200
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CDT FRIDAY MAY
30 2025.
ALERTS IN EFFECT...AIR QUALITY WARNINGS FOR PARTS OF SOUTHEASTERN AND
WEST CENTRAL MANITOBA AND NORTHERN SASKATCHEWAN. SPECIAL AIR QUALITY
STATEMENTS FOR MUCH OF MANITOBA AND PARTS OF CENTRAL SASKATCHEWAN,
ALBERTA AND THE NWT. HEAT WARNING FOR MUCH OF ALBERTA. FOG ADVISORY
FOR CORAL HARBOUR AND RESOLUTE.
SYNOPTIC OVERVIEW...ALOFT, A TROUGH LIES OVER NWT AND ALBERTA BEFORE
BECOMING AN AMPLIFIED RIDGE OVER THE EASTERN PRAIRIES. THE SAME RIDGE
POKES UP THROUGH MAINLAND NUNAVUT AND THE HIGH ARCTIC. DEEP TROUGH
ANCHORED BY A LOW CENTRE OVER THE LABRADOR SEA ARCS THROUGH WESTERN
QUEBEC, INTO EASTERN ONTARIO.
AT THE SURFACE, RIDGING LIES OVER BC. DEEP LOW CENTRE OVER THE
BEAUFORT WITH A COLD FRONT DRAPED SOUTHWARDS, THROUGH EASTERN NWT
INTO SASKATCHEWAN. THE WARM FRONT ARCS SOUTH-SOUTHEASTWARDS OVER
NORTHERN MANITOBA. HIGH CENTRE OVER NORTHERN HUDSON BAY WITH RIDGING
SOUTH, INTO NORTHWESTERN ONTARIO, AND NORTHWARDS, OVER BAFFIN ISLAND.
DISCUSSION...
AB/NT...A NUMBER OF WILDFIRES WERE PRODUCING NOTABLE SMOKE SINCE
YESTERDAY IN NORTHERN AB AND NE BC. MUCH OF NORTHERN ALBERTA IS UNDER
A SPECIAL AIR QUALITY STATEMENT OR AN AIR QUALITY WARNING. WHILE THE
COLD FRONTAL PASSAGE HAS HELPED TO IMPROVE AIR QUALITY IN SOME
REGIONS, THE WIND SHIFT HAS ALSO ADVECTED MORE SMOKE IN FROM BC IN
OTHER REGIONS. CONDITIONS SHOULD IMPROVE SOMEWHAT IN ALBERTA (ASIDE
FROM IMMEDIATELY DOWNSTREAM OF THE FIRES) AS A SHIFT TO SOUTHWESTERLY
WINDS TODAY SHOULD PUSH A LOT OF THE BC SMOKE INTO THE NWT.
SK/MB...UPPER RIDGING CONTINUES TO DOMINATE BOTH SASKATCHEWAN AND
MANITOBA, MAINTAINING THE WARM, DRY CONDITIONS WHICH HAVE FUELED
FOREST FIRE ACTIVITY. WILDFIRES CONTINUE TO EJECT MASS AMOUNTS OF
SMOKE INTO PARTS OF NORTHERN SASKATCHEWAN AND MANITOBA AND THESE
CONDITIONS WILL CONTINUE INTO THE WEEKEND AND BEYOND. SMOKE LINGERS
ALOFT OVER MUCH OF SOUTHERN MANITOBA TODAY. CONDITIONS WILL LIKELY
WORSEN BEGINNING FRIDAY NIGHT AS THE WIND DIRECTION SHIFTS TO
NORTHWESTERLY BEHIND A COLD FRONT THAT IS SET TO TRACK THROUGH THE
PROVINCE. IN NORTHERN MANITOBA, MUCH OF THE SMOKE WILL REMAIN IN
COMMUNTIES ADJACENT TO THE PROVINCIAL BOUNDARY. IN SOUTHERN SK, THE
AFOREMENTIONED COLD FRONT WILL BRING DOWN THE SMOKE AS WINDS SWITCH
TO NORTHWESTERLY FRIDAY. ALERTS FOR POOR AIR QUALITY MAY BE EXPANDED
ACROSS THE SOUTHERN PRAIRIES, REMAINING FOR SOME THROUGH THE WEEKEND.
THE THUNDERSTORM THREAT WILL SHIFT INTO EASTERN SASKATCHEWAN AND
WESTERN MANITOBA ON FRIDAY AS THE FRONT IN WESTERN SASKATCHEWAN
APPROACHES. THUNDERSTOMS SHOULD REMAIN NON-SEVERE IN NATURE, WITH A
FEW PRODUCING GUSTS OF 70 TO 80 KM/H THROUGH SOUTHEASTERN SK/
SOUTHWESTERN MB FRIDAY AFTERNOON/EVENING.
SHOWERS ALONG THE SAME FRONT ARE EXPECTED ACROSS NORTHERN MB FRIDAY
NIGHT INTO SATURDAY. UNFORTUNATELY, AMOUNTS WILL BE LACKLUSTER, WITH
ONLY A FEW MILLIMETRES (AT MOST) FALLING MAINLY ACROSS FAR NORTHERN
REGIONS.
NU...FOG HAS BEEN IN AND OUT OF RESOLUTE OVER THE LAST DAY. THERE IS
LITTLE APPRECIABLE CHANGE IN THE FLOW UNTIL THIS AFTERNOON WHEN WINDS
STRENGTHEN AHEAD OF AN INCOMING SHORTWAVE, ALLOWING VISIBILITY TO
IMPROVE MORE SUBSTANTIALLY.
WINDS WILL INCREASE OUT OF THE SOUTH ON FRIDAY AFTERNOON ACROSS THE
KIVALLIQ AHEAD OF AN APPROACHING TROUGH OF LOW PRESSURE. SHOWERS ARE
EXPECTED TO BEGIN FRIDAY NIGHT AND PERSIST INTO SATURDAY FOR MOST
KIVALLIQ COMMUNITIES.
LIGHT, ONSHORE FLOW BROUGHT IN THE MARINE LAYER TO CORAL HARBOUR
OVERNIGHT. FOG TO LIFT AND VISIBILITY TO IMPROVE FRIDAY MORNING.
END/DYKES/STAUNTON
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