A powerful low-pressure system is likely to spawn a dangerous outbreak of severe thunderstorms in portions of the Midwest, South and East, where tornadoes, widespread damaging winds, large hail and flash flooding are all concerns.

Severe thunderstorm outlooks issued by NOAA's Storm Prediction Center can show a threat level from 1 to 5. They are used to show how widespread and intense severe weather could be on a given day.

The threat of tornadoes is moving east into the Mississippi Valley and Deep South a day after a massive storm system moving across the country unleashed winds that damaged buildings, whipped up dust s

Severe storms are on the way this weekend and have the potential for unleashing powerful tornadoes and destructive hail across the South. A "squall line of storms" will begin to develop Friday afternoon in the central U.

The dangerous outbreak will sweep through the Midwest, South and East through the weekend. Saturday could be one of the worst severe weather days of the year.