Eta 500 mb

21/00 UTC Eta 500 mb forecast valid 22/18 UTC.

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The 21/00 UTC Eta forecast indicated the potential for a significant snowstorm for northeast Pennsylvania and southern New York from the afternoon on the 22d into the morning of the 23rd. The 500 mb forecast indicated that a shortwave would be tracking northeast across Pennsylvania during the afternoon on the 22d, while a second, much stronger wave tracked east across Illinois.

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