700 mb frontogenesis and 650-500 EPV (negative values shaded)
Notes:
Negative values of EPV from 650-500 mb were co-located with 700 mb frontogenesis during the peak of the storm on the morning of the 23rd, enhancing the upward branch of the direct circulation associated with the frontogenesis, and setting the stage for intense bands of heavy snow over portions of eastern Pennsylvania and New Jersey.
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Slide 10