Eleven people were killed in southern Georgia early Sunday morning as storms associated with this weather system rolled through the area. Another four people were killed in MS by a tornado on Saturday.
The National Weather Service said late Sunday morning that we may be looking at "possibly largest severe weather outbreak since 2008".
The Sheriff's Office said a mobile home at Airline and Centennial roads was destroyed with a man inside.
He said: "I woke up and I looked outside - it was just a lot of thundering and lightning, and it was real dark".
Those shelters were opened as three cells moved through the Albany area.
In Mississippi, the state's emergency agency released a statement on its website that said that a tornado has killed at least four people and caused more than 20 injuries.
The National Weather Service in Melbourne urged residents to be alert in a Sunday morning tweet, noting the threat of severe weather in the county had been upgraded.
Most of South Georgia and North Florida are in the "high" risk category.
The ingredients for potentially significant severe weather will likely come together across the Carolinas by later today, and the threat of severe thunderstorms and tornadoes will increase substantially.
"The threat for tornadoes or waterspouts is small as this front passes across the state", Spann explained.
It is forecast the severe weather will continue throughout the weekend into Monday and that other USA states will be affected.
Now you may be thinking, "10% chance is not very high".
The time frame for severe weather will run from the mid afternoon hours and last into the late evening.
The deaths are said to be weather-related but it has not been specified whether tornadoes were the cause.