Here we see two supercell thunderstorms located to the west of the photographer.  The northern cell put out a gust front which resulted in the roll cloud over western Hamilton County.  While gust fronts are usually associated with linear systems such as squall lines and bow echoes, this case shows how supercells can produce gust fronts as well.  However, outflow displaced this far from a supercell will usually cause it to weaken and lose its rotation.  Accordingly, this storm weakened and lost its supercell characteristics shortly after this radar image was taken..