A winter storm underway across the Northeast will be notable for its prolonged duration into Tuesday; generating widespread heavy snow (1-2 feet), and several weaker disturbances lined up to follow reinforcing below average temperatures across the Northeast (coldest over fresh snowcover) for more than 1 full week. However, even the coldest air surging deep into the Southeast early this week (Monday and Tuesday) is not of arctic origin, and will quickly warm back to above average temperatures by midweek along with the entire central U.S. Pacific storms moving through the West this week are also devoid of extreme cold air and noticeably milder than observed last week. While extended range model forecasts are uncertain in timing details at some point by late next week (after Dec 10) both the West and Northeast will also noticeably warm, as a mild pattern by early winter standards becomes fully established across the U.S. and southern Canada. Seasonal temperatures between the northern Rockies and northern Plains appear to be main exceptions to near coast to coast above average warmth forecast to predominate mid-late December. The north-central U.S. also remains forecast by the 30-day MWA ensemble to be the initial focus of returning arctic air during the final days of December (after Christmas), marking early stages of a frigid Eastern half of the U.S. by early January.
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