Cross-sections - 00z September 3
Notes:
A cross-section of Petersen frontogenesis and ageostrophic wind vectors, shown on the left and valid at 00z on the 3rd, shows a strong thermally direct circulation across central New York and eastern Pennsylvania, with upward motion in the warm air south of a sloping frontal zone in the northern part of the cross section. An enhanced low-level jet can be seen streaming toward the frontal zone from the south. The low-level jet can also be seen in the slide on the right, which shows frontogenesis and contours of wind speed. In addition, the upper level jet can be seen above the frontal zone.
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Slide 7