More than 9 million people live in parts of Texas, Oklahoma, Arkansas and Louisiana where there is an enhanced risk of severe weather on Friday, according to the Storm Prediction Center.
The threat moves eastward Saturday, with the potential bullseye covering millions of people across much of Mississippi and Alabama, plus parts of eastern Louisiana and the Florida Panhandle. Storms could reach as far north as the Ohio Valley.
Heavy rains are possible in addition to damaging winds, according to the Storm Prediction Center. Many streams already are at or near flood levels because of earlier storms.