Strong and severe storms will bring the possibility of damaging winds, hail, and even an isolated tornado. The weather service says power outages could occur where the heaviest amounts fall.
The area most at risk for Tuesday's storms is heavily populated, with more than 10 million people and major Florida cities such as Jacksonville, Tampa and Orlando, Savannah, Georgia; and Charleston, South Carolina. "So, an active pattern will continue".
Tuesday's potential for severe weather depends heavily on how quickly Monday evening's storms end.
The office also tweeted that downed trees and power lines were blocking roads in the county along the Tennessee border.
Only a few injuries are being reported.
Part of the roof was ripped off the nursing school and Pete Mathews Coliseum, a 3,500-seat basketball arena.
A severe weather risk has developed for early Monday morning across South Mississippi as storms that developed in Texas move across Louisiana, and into South Mississippi.More news: Lockdown lifted after 4th bomb threat at Hernando County school
Forecasters said the storm threat was unusually risky because of the possibility of several tornadoes, some of which could be intense.
The greatest risk for one-inch hail, damaging wind, cloud-to-ground lightning and standing water will be found between the Triad and Goldsboro, the weather service said.
A tornado watch will be in effect for DeSoto County until 7 p.m., Meteorologist Scott Zedeker said.
Alabama Emergency Management Executive Operations Officer Jeff Smitherman raised the threat level and increased staffing at Alabama's emergency management agency.
Georgia Power reported that about 8,000 customers were without power Tuesday morning statewide, with more than 2,000 of them in the Haralson area.
Here is another look at the timing for the Tennessee Valley.
TORCON isn't an official weather term that the National Weather Service (NWS) or National Oceanic and Atmospheric Administration use.
"We can't rule out a strong tornado east of Interstate 65 at this point with all the ingredients coming together", Weber added.