The new weekly ECMWF model just came in and it shows very cold air over the western half of Canada shifting south and east and expanding into eastern Canada (not Atlantic Canada) and the eastern U.S. by the second week of December as the North Atlantic Oscillation shifts back into a negative phase. A second indicator, the MJO, also suggests a cold pattern into eastern North America starting around the 5th.
In the meantime, a fairly mild pattern across the U.S. and southern Canada through the weekend, but quite unsettled over the Pacific NW and southern BC with heavy coastal rain and mountain snow through early next week.
Looks like a significant cold shot coming down into northern BC and northern Alberta next week then gradually settling southward.
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Some snow today across southwestern Ontario as the west remains under strong high pressure ridge.
Significant snow is likely for parts of New Brunswick this weekend.
Cold air expected to spill into eastern North America in about 10 to 14 days.
Arctic air likely to retreat well to the north as we go into early December.
Active weather pattern through next week.