The National Weather Service in Peachtree City has a explanatory slide on Mesoscale Convective Systems which may be useful to you, since one may be impacting the weather here in the South later today and causing severe weather, mainly strong winds and frequent lightning, across the area.  The slide is attached below for some basic information on MCS’s.

You can follow the eastward progress of the system using the lightning map I highlighted in a post yesterday at www.lightningmaps.org.