Tornadoes struck the Deep South after a line of storms moved through the region Wednesday, part of a system that is expected to continue further into the Southeast and the Eastern Seaboard on Thursday, leaving millions at risk from severe weather conditions.Tornadoes struck the Deep South after a line of storms moved through the region Wednesday, part of a system that is expected to continue further into the Southeast and the Eastern Seaboard on Thursday, leaving millions at risk from severe weather conditions.