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Before I get to the long range, much cooler and less humid air has spread into eastern North America as the massive ridge along the East Coast has weakened and retreated. While there will still be some spells of warmer weather in the East, the period of summer-like warmth is over for the season. The humidity will remain higher than normal over the eastern Maritimes and Atlantic Canada the rest of this month with more opportunities for rain as a southwesterly flow aloft dominates.
There will also be a brief, reinforcing shot of Arctic air into the western Prairies Friday night with a period of rain showers quickly going over to snow from southern and central Alberta to southern Saskatchewan. Accumulations will likely be under 5 cm for most areas before it ends on Saturday. A gradual warmup will begin next week in the west.
Week of October 22 to 28
Week of October 28 to November 4
Week of November 5 to 11
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A drier and milder pattern for the West while the East experiences real fall.
Major shift in the weather pattern on the way.
Extreme weather pattern across North America to persist into next week.
Plenty of cold for the Prairies and more snow as well.
Coldest air will be directed into the Prairies over the next 1-2 weeks.
Chilly air to expand eastward as we head into October.