120
FOCN45 CWWG 211200
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CDT WEDNESDAY
OCTOBER 21 2026.
ALERTS IN EFFECT...SNOWFALL WARNINGS FOR FORT MCPHERSON, AKLAVIK AND
INUVIK. STORM SURGE WARNING FOR TUKTOYAKTUK.
SYNOPTIC OVERVIEW...ALOFT, AN UPPER LOW IS OVER THE ARCTIC OCEAN
WITH A TROUGH SOUTHWARD TO THE GULF OF ALASKA. TWO SHORTWAVES ARE
LOCATED WITHIN THE TROUGH, ONE OVER NORTHERN YUKON AND THE OTHER IS
LOCATED IN THE BASE OF THE TROUGH, OVER THE GULF OF ALASKA. UPPER
RIDGING IS OVER THE PRAIRIES AND EXTENDS THROUGH THE CENTRAL ARCTIC.
AN UPPER LOW IS NEAR SOUTHAMPTON ISLAND WITH TROUGHING SOUTHWARD
THROUGH ONTARIO. ANOTHER UPPER LOW IS OVER DAVIS STRAIT.
AT THE SURFACE, A 979 MB LOW IS NEAR FORT GOOD HOPE WITH A TROUGH
EXTENDING SOUTHWARD THROUGH ALBERTA. A RIDGE IS OVER THE SOUTHERN
PRAIRIES AND EXTENDS NORTHWARD THROUGH NORTHERN MANITOBA INTO
SOUTHERN KIVALLIQ. A 1005 MB WEAKENING LOW PRESSURE SYSTEM IS OVER
EASTERN HUDSON BAY. HIGH PRESSURE IS OVER BAFFIN ISLAND. A 1002 MB
LOW IS OVER DAVIS STRAIT.
DISCUSSION...
WESTERN PRAIRIES...TODAY WILL BE ANOTHER PLEASANT DAY ACROSS THE
WESTERN PRAIRIES, WITH ABOVE SEASONAL DAYTIME HIGHS RANGING FROM 10
TO 20 DEGREES. MOST REGIONS WILL SEE SIMILAR CONDITIONS ON THURSDAY.
FRIDAY WILL BRING A DRAMATIC SHIFT IN THE WEATHER, WITH RAIN, SNOW,
AND MUCH COOLER TEMPERATURES.
EASTERN PRAIRIES...GENERALLY BENIGN WEATHER CONTINUES ACROSS THE
PRAIRIES WITH ABOVE SEASONAL TEMPERATURES PERSISTING THROUGH THE
NEXT FEW DAYS.
HOWEVER, A CHANGE IS COMING AS A A SIGNIFICANT LOW PRESSURE SYSTEM
IS PROGGED TO IMPACT THE PRAIRIES FRIDAY AND THROUGH THE WEEKEND.
THIS SYSTEM WILL SPREAD RAIN, SNOW, FREEZING RAIN, AND STRONG WINDS
THROUGH THE REGION FOLLOWED BY A COOLER PATTERN NEXT WEEK.
WESTERN ARCTIC...THE LOW NEAR FORT GOOD HOPE WILL CONTINUE TO IMPACT
THE NORTHERN NORTHWEST TERRITORIES OVER THE NEXT 24 HOURS. ROUGHLY 6
CM OF SNOW ACCUMULATED OVERNIGHT IN INUVIK, WITH AN ADDITIONAL 5 TO
10 CM EXPECTED TO FALL ACROSS THE MACKENZIE DELTA TODAY, WHERE
SNOWFALL WARNINGS REMAIN IN EFFECT. WITH WIND GUSTS NO GREATER THAN
50 KM/H, BLOWING SNOW REMAINS MINIMAL.
AS THE LOW PRESSURE SYSTEM MOVES EASTWARDS THIS AFTERNOON, ONSHORE
FLOW IS EXPECTED TO DRIVE A STORM SURGE EVENT IN TUKTOYAKTUK AROUND
THE NOON HOUR TODAY, WITH MODERATE FLOODING POSSIBLE AT HIGH TIDE.
OTHER ARCTIC COMMUNITIES AFFECTED BY THIS LOW OVER THE NEXT TWO DAYS
WILL EXPERIENCE SNOW, STRONG WINDS, AND LIKELY SOME BLOWING SNOW AT
TIMES. WITH WIND GUSTS UP TO 80 KM/H IN FOR FORECAST FOR SOME
COMMUNITIES, NEAR BLIZZARD CONDITIONS ARE POSSIBLE.
EASTERN ARCTIC...THE LOW OVER DAVIS STRAIT IS BRINGING SNOW TO
QIKIQTARJUAQ. NORTHERLY UPSLOPE FLOW WILL SLIGHTLY ENHANCE SNOWFALL
AMOUNTS OVER THE COMMUNITY WITH TOTAL SNOWFALL AMOUNTS OF 4 TO 8 CM
FORECAST BY WEDNESDAY EVENING.
THE LOW NEAR FORT GOOD HOPE WILL TRACK EASTWARD PUSHING SNOW, GUSTY
WINDS AND RESULTING BLOWING SNOW THROUGH NORTHERN BAFFIN ISLAND AND
MELVILLE PENINSULA AND MIXED PRECIPITATION THROUGH KIVALLIQ ON
THURSDAY. AS THE LOW CONTINUES TO TREK EASTWARD, SNOW WILL SPREAD
THROUGH BAFFIN ISLAND THROUGH THURSDAY NIGHT AND FRIDAY. NO NOTABLE
ACCUMULATIONS ARE FORECAST.
END/MOODIE/VALLEE
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page