703
FOCN45 CWWG 111900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT FRIDAY
SEPTEMBER 11 2026.
ALERTS IN EFFECT...AIR QUALITY WARNING FOR FORT SIMPSON. RAINFALL
WARNING FOR PARTS OF NORTHEASTERN MANITOBA. COASTAL FLOOD ALERT FOR
HERSCHEL ISLAND. SPECIAL MARINE WARNING FOR FREEZING RAIN OVER THE
BEAUFORT.
SYNOPTIC OVERVIEW...ALOFT, A LOW SPINS IN THE ARCTIC OCEAN WITH
TROUGHING OVER THE ARCTIC ISLANDS. ANOTHER UPPER LOW SPINS OFF THE
COAST OF SOUTHERN BC. A THIRD UPPER LOW IS OVER NORTHEAST MANITOBA.
AN UPPER RIDGE ARCS OVER ONTARIO AND QUEBEC, THEN SPRAWLS NORTH
TOWARDS BAFFIN ISLAND. THERE IS A LONGWAVE TROUGH OVER ATLANTIC
CANADA WITH MULTIPLE SHORTWAVES EMBEDDED.
AT THE SURFACE, A WEAK INVERTED TROUGH FROM THE PACIFIC NORTHWEST
EXTENDS NORTH ALONG THE BC COAST. A HIGH PRESSURE IS OVER SOUTHERN
YUKON WITH RIDGING INTO NWT AND WESTERN NUNAVUT. ANOTHER RIDGE FROM
THIS HIGH SPREADS SOUTH OVER NORTHERN BC AND ALBERTA. A LOW CENTRE
IS OVER NORTHEASTERN MANITOBA. ANOTHER WEAK LOW IS NEAR NORTHERN
BAFFIN ISLAND. A RIDGE FROM SOUTHERN ONTARIO EXTENDS NORTH TO A HIGH
PRESSURE CENTRE OVER FOXE PENINSULA. FINALLY, A LOW SPINS OVER
LABRADOR SEA.
DISCUSSION...
WESTERN PRAIRIES AND NT...A LOW NEAR THE 60TH PARALLEL AND NEAR THE
SASKATCHEWAN/MANITOBA BORDER IS GENERATING WIDESPREAD SHOWERS AROUND
AREAS OF NORTHEASTERN ALBERTA AND ACROSS NORTHERN SASKATCHEWAN.
RAINFALL AMOUNTS OF 5-10 MM IS EXPECTED TODAY BEFORE THE RAIN SLOWLY
TAPERS OFF OVERNIGHT TONIGHT. BRISK, GUSTY WINDS TO THE WEST OF THE
LOW WILL PERSIST TODAY BEFORE SLOWLY WEAKENING TONIGHT AND INTO
SATURDAY.
OVERNIGHT TONIGHT, COLD AIR IN BEHIND THE LOW IS EXPECTED TO BRING
SOME FREEZING OR NEAR FREEZING TEMPERATURES TO MUCH OF ALBERTA. IN
PARTICULAR, THE NORTHWESTERN REGIONS AND AREAS NEAR THE FOOTHILLS. A
SURFACE HIGH SETTING UP NEAR THE HINTON REGION WILL BRING AN
EASTERLY UPSLOPE FLOW TO THE SOUTHWESTERN PORTIONS OF THE PROVINCE,
SO THERE IS THE CHANCE THAT FOG/STRATUS MAY DEVELOP AND SAVE THESE
REGIONS FROM DEVELOPING FROST. A FROST ADVISORY WILL BE ISSUED THIS
AFTERNOON, FOR AREAS MOST AT RISK OF DEVELOPING FROST.
IN FORT SIMPSON, AIR QUALITY HAS IMPROVED FOR THE TIME BEING.
HOWEVER, AS WILDFIRES CONTINUE TO BURN, AND A LIGHT SOUTHERLY FLOW
DEVELOPS THIS EVENING, SMOKE IS LIKELY TO RETURN TO THE COMMUNITY.
OVER ISR, DRIZZLE/SHOWERS AND FOG (PARTICULARLY ALONG THE ARCTIC
COAST) ARE LIKELY BEFORE THE NEXT SYSTEM MOVES IN FROM THE BEAUFORT
BRINGING STEADIER RAIN TO MUCH OF THE REGION TODAY, TONIGHT AND INTO
SATURDAY.
ELSEWHERE, AN APPROACHING LOW AND ITS ASSOCIATED WARM FRONT,
CURRENTLY NORTH OF ALASKA, WILL MOVE INTO THE BEAUFORT TODAY AND
THIS EVENING, SPREADING AN AREA OF FREEZING RAIN ACROSS MANY ARCTIC
MARINE REGIONS.
EASTERN PRAIRIES...THE LOW OVER NORTHEASTERN MANITOBA WILL CONTINUE
SLOWLY MOVING EAST, AND THE STEADY RAIN OVER NORTHEASTERN MANITOBA
WILL CONTINUE THROUGH TO SATURDAY. RAINFALL TOTALS LOOK TO BE IN THE
25 TO 40 MM RANGE. AS A RESULT, THE RAINFALL WARNING CONTINUES FOR
THE REGION. STRONG NORTHWEST WINDS, ON THE BACK SIDE OF THE LOW WILL
AFFECT THE HUDSON BAY COAST OF MANITOBA SATURDAY, WITH GUSTS OF 80
TO 90 KM/H LIKELY. WIND WARNINGS MAY BE ISSUED LATER THIS AFTERNOON
FOR CHURCHILL.
NUNAVUT...A LOW PRESSURE SYSTEM WILL CONTINUE TO BRING LIGHT SNOW TO
RESOLUTE BAY AND GRISE FIORD. GRISE FIORD MAY SEE SOME SNOW
ACCUMULATIONS OF UP TO 4 CM BY THE END OF THE DAY SATURDAY.
END/BILOUS/ALBRECHT
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