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Summary

• Low-to-mid tropospheric frontogenesis increased rapidly as the storm moved north toward a baroclinic zone.
• A strong, thermally direct circulation developed along an on the warm side of the frontal zone.
• Upward motion became co-located with a region of negative lapse rates.
• This may have helped developed a band of heavy rain well to the west of the center, over central New York and northeast Pennsylvania.