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300mb Heights & Winds -
The sequence of 300mb maps clearly shows the polar and subtropical jetstreams at the beginning of
the animation; each has a jetstreak embedded within its circulations. During the animation, the jetstreams
merge and by 31 December a trough and jetstreak positioned in the base of the trough is located over the east
coast of the United States. The strong divergence this created supported a strong surface low pressure system -
a Nor’easter.
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