"We’re absolutely going to see some kind of impactful weather, it’s just a matter of how widespread," NWS warns.

The National Weather Service issued tornado watches for more than 2 million people on Saturday. An "outbreak" of tornadoes and severe thunderstorms is expected through Saturday night in Alabama, Mississippi, Louisiana, western Georgia, southern Tennessee, the Florida Panhandle and southern Arkansas.

We all hear the terms when there's a threat of severe weather. But what does each alert mean, and how does it affect you?