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This radar shows two distinct supercell thunderstorms.  The one that produced the porch damage is the northern one, located in northeastern Brown County.  This storm exhibits a kidney-bean shape, which sometimes characterizes high-precipitation supercells (the most common type of supercell in the Ohio Valley).  The most notable feature to a storm of this shape is the reflectivity notch on it eastern side.  This notch is indicative of a rotating updraft.  Click the link below the radar image for a look at the rotation in this storm.