Cross-section
Vertical motion and frontogenesis (shaded) left, vertical motion and lapse rate below 2 degrees C per km (shaded) right.
Notes:
Southeast-to-northwest oriented cross sections taken during the period of heaviest snowfall in southern New York and northeast Pennsylvania are shown on this slide. Frontogenesis (shaded) and vertical motion (yellow contours) are on the left, indicating a pronounced plume of upward motion located above and on the warm side of a sloping region of frontogenesis. The image on the right shows vertical motion (yellow contours) and lapse rates (values less than 2 degrees C per km shaded). Reduced lapse rates can be seen juxtaposed with the strong upward vertical motion near the middle of the cross-section, where the heaviest snow was falling.
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Slide 8