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This large squall line contained several embedded supercells.  While squall lines are typically associated with straight-line winds, this case shows that they can produce tornadoes as well, especially when they contain supercellular storms.  The storms over Brown and Highland Counties look like supercells, but the tornado-producing storm over Pickaway County is lacking the classic supercell characteristics such as a hook echo or weak echo region.  Click on the link to the velocity image to see the rotation embedded within this storm.