Behind the nor'easter on Sunday (see details in the Winter Weather Outlook), the NAO will dive down near -1SD with the AO and PNA around neutral. The intense low pressure associated with the nor'easter will move near 50/50, pulling down arctic air into the region, with strong high pressure dropping near the Great Lakes Region. The possibility exists for a the coldest air of the season starting Monday with high temperatures between 15 and 25 through the end of the week, and lows dropping below zero for the first time this season. I'll have some historical references later tonight. There is the possibility of low temperatures reaching record levels, particularly on Tuesday or Wednesday.
Another coastal storm could affect the region on Wednesday, but confidence low at this point especially beyond Sunday in terms of storm development and tracks.
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