The National Weather Service issued multiple tornado and severe thunderstorm warnings early Saturday for areas in Alabama, Kentucky, Mississippi, Tennessee, Illinois, Indiana and Texas.

A sprawling storm system crossing the U.S. has overturned semitrucks on highways and fanned wildfires in Texas, Oklahoma, Missouri and Kansas. Tornado threats loom for the Mississippi Valley into the

The system moving through New Orleans, Lafayette and Baton Rouge is capable of spinning off multiple tornadoes and more. Here's what you need to know.

Saturday’s setup is shaping up to be a particularly dangerous situation. Increased instability (how quickly the air rises) and wind shear (how the air changes in wind direction and speed with height) will lead to the risk of severe storms capable of producing tornadoes.