Visible satellite imagery
Notes:
The data on this slide shows that a large area of cloudiness covered central New York and northern Pennsylvania prior to the onset of severe weather from late morning through early afternoon. This cloud cover reduced the instability across the area, however a very warm and humid air mass was in place across the area and temperatures were still able to reach near or just above 80 degrees in many places, with dew points near 70.
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Slide 12