The intense Pacific “atmospheric river” storm track across California to the Great Basin is releasing mild maritime air eastward of the Continental Divide extending anomalous warmth to the Atlantic Seaboard. Canada is very cold, and the attendant chill should extend southward across snow cover. New York and New England are at risk of "sneaky cold" late December.

Lack of snow cover is helping to propel a mild climate across Europe. However, a colder change may be on the way in the extended range. Stratospheric warming propelling an arctic air mass in Canada and into the East U.S. during early December shifts westward to Asia during the next 2-3 weeks. The emerging stratospheric warming over Asia will cause a cold air mass to initiate across Northern Asia into early next week.