0-6 km shear and supercell composite at 18zNotes:Deep layer shear was adequate for the development of supercells. The data on this slide shows 40 kt northwesterly deep layer shear across southern New York and Pennsylvania. The supercell composite parameter, which is a function of instability and shear. Was maximized over eatern Pennsylvania at 18z, with an extension northward into southern New York. Switch images by moving your mouse pointer over numbered buttons...
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