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?

Widespread severe weather was looking more and more likely in Alabama on Saturday, and part of Alabama has been added to a rare Level 5 out of 5 severe weather risk. NOAA’s Storm Prediction Center issues nationwide severe weather outlooks and forecasts severe weather categories that run from Level 1 (marginal) to Level 5 (high).