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

An "outbreak" of tornadoes and severe thunderstorms is expected through Saturday night in Alabama, Mississippi, Louisiana, and other southern states.

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?

An "outbreak" of tornadoes and severe thunderstorms is expected through Saturday night in Alabama, Mississippi, Louisiana, and other southern states.

A dangerous storm system is expected to sweep through the St. Louis region Friday evening, bringing the potential for destructive winds and fast-moving tornadoes, with the metro area under a Level 4 out of 5 risk for severe weather.

A significant severe weather day is anticipated for Saturday across Southeast Louisiana and South Mississippi. We remain highlighted in a level 4 out of 5 moderate risk for severe weather. This threat will begin by late morning Saturday and continue through sunset in the evening.