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This radar image shows an extensive squall line, which produced widespread wind damage across a very large portion of the Ohio and Tennessee Valleys.  Notice little "fingers" of weaker reflectivity on the back edge of the squall line.  These are referred to as rear inflow notches, and indicate strong jets of wind coming from the rear of the line of storms toward the leading edge.  These inflow jets can result in severe wind gusts at the surface.