037
FOCN45 CWWG 101200
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CDT THURSDAY
SEPTEMBER 10 2026.
ALERTS IN EFFECT...AIR QUALITY WARNING FOR FORT SIMPSON. RAINFALL
WARNING FOR PARTS OF NORTHERN MANITOBA.
SYNOPTIC OVERVIEW...THE 00Z UPPER ANALYSES REVEALED A TROUGH FROM THE
NWT TO THE EASTERN PACIFIC, AND ANOTHER TROUGH OVER NORTHWESTERN
QUEBEC. A RIDGE SAT BETWEEN THE TROUGHS, FROM THE KIVALLIQ TO
WASHINGTON STATE.
THE SURFACE ANALYSIS SHOWS A LOW OVER NORTHERN SASKATCHEWAN WITH A
COLD FRONT DRAPED SOUTHWESTWARD FROM IT, AND A LOW OVER EASTERN
HUDSON BAY.
DISCUSSION...
WESTERN PRAIRIES AND NT...A LOW NEAR THE 60TH PARALLEL IS GENERATING
PROLONGED, WIDESPREAD SHOWERS AROUND GREAT SLAVE LAKE AND OVER
NORTHERN ALBERTA/SASKATCHEWAN. LOCALIZED TOTAL AMOUNTS OF 5-10 MM
PER FORECAST PART PERIOD IS EXPECTED.
SOUTH OF THE LOW, THE FRONTAL WAVE IS TRANSVERSING ALBERTA, BRINGING
ADDITIONAL SHOWER AND ISOLATED THUNDERSTORM ACTIVITY TO CENTRAL AND
SOUTHERN REGIONS. INSTABILITY BEHIND THIS COLD FRONT WILL CO-LOCATE
WITH THE UPPER TROF, AND WILL ENHANCE THE LIKELIHOOD OF LIGHT SHOWER
ACTIVITY THIS AFTERNOON. SHOWERS WILL CONTINUE INTO TONIGHT AND
FRIDAY BEFORE THE TROF FULLY PULLS OFF TO THE EAST. STRONG, GUSTY
WINDS ALONG AND BEHIND THE
COLD FRONT WILL DEVELOP TODAY AND PERSIST THROUGH THE REMAINDER OF
THE
FORECAST PERIOD.
GUSTY WEST WINDS ARE ALSO OCCURING OVER SOUTHWESTERN ALBERTA AHEAD
OF THE COLD FRONT, WITH THE STRONGEST GUSTS OCCURING OVER EXTREME
SOUTHWESTERN ALBERTA (80-90 KM/H).
THE COLD FRONT IS ALSO EXPECTED TO LOWER SNOW LEVELS IN THE MOUNTAIN
PARKS, WITH LEVELS DROPPING TO ROUGHLY 2000M TODAY AND CLOSE TO
1500M ON TONIGHT. THIS COULD LEAD TO MIXED PRECIPITATION OVER THE
HIGHEST TERRAIN TONIGHT INTO FRIDAY, WITH A TRANSITION OVER
TO SOME SNOW AT THESE HIGHER ELEVATIONS.
IN FORT SIMPSON, AIR QUALITY HAS IMPROVED. HOWEVER, WE ARE UNSURE
FOR HOW LONG THIS WILL LAST AND HAVE OPTED TO KEEP THE WARNING IN
PLACE FOR THE TIME BEING TO MONITOR THE SITUATION.
OVER THE SAHTU AND ISR, DRIZZLE/SHOWERS AND FOG (PARTICULARLY ALONG
THE ARCTIC COAST) ARE LIKELY.
EASTERN PRAIRIES...THE LOW OVER NORTHERN SK IS FORECAST TO MOVE
EASTWARD OVER THE NEXT COUPLE OF DAYS, BRINGING SOME STEADY RAIN TO
PARTS OF THE NORTHERN PRAIRIES. OF PARTICULAR CONCERN IS NORTHEASTERN
MANITOBA, WHERE MOISTURE WILL WRAP AROUND THE LOW, LIKELY AUGMENTED
BY SOME THUNDERSTORM ACTIVITY, AND RAIN WILL START FALLING THIS
EVENING. 24-HOUR RAINFALL LOOKS TO BE IN THE 25 TO 40 MM RANGE. AS A
RESULT, WE HAVE ISSUED A RAINFALL WARNING FOR THE REGION.
FARTHER SOUTH, SOME INSTABILITY IS LIKELY ALONG THE TRAILING COLD
FRONT FROM EAST-CENTRAL SK TO CENTRAL MB THIS AFTERNOON. SEVERE
WEATHER ISN'T EXPECTED, AS INSTABILITY WILL REMAIN LOW.
NUNAVUT..NIL SIG WX.
END/CARLSEN/PIMISKERN
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