500 mb height falls and 1000-850 mb frontogenesis
Notes:
Forcing for upward vertical motion on the 26th can be inferred by the data on this slide. 500 mb height falls were centered over the central Appalachians and western mid-Atlantic region, with very small height falls farther northeast across Pennsylvania and southern New York. Meanwhile, the shaded frontogenesis maxima associated with the low-level front can be seen stretching from southern Quebec southwest to northern Ohio. In summary, forcing for large-scale upward vertical motion across southern New York and northern Pennsylvania was not strong in this case.
Slide 7