National Weather Service United States Department of Commerce
Downbursts ("Straight-Line" Winds)
Winter March April May
June July August Autumn

 

Large Hail
Winter March April May
June July August Autumn

 

   Tornadoes
             
Winter Spring
             
Summer Autumn

 

                    An (hopefully useful) explanation of these maps.

Interactive Historical Tornado Track Map for the Carolinas & Northeast Georgia