OKLAHOMA CITY (AP) — The threat of tornadoes moved east into the Mississippi Valley and Deep South on Saturday, a day after a massive storm system moving across the country unleashed winds that damaged buildings, whipped up dust storms that caused deadly crashes and fanned more than 100 wildfires in several central states.

Alabama is bracing for two rounds of severe weather on Saturday, and the first could affect parts of west Alabama early this morning. NOAA’s Storm Prediction Center has issued a tornado watch for parts of west and north Alabama.

The severe weather threat, including multiple strong tornadoes, will extend well beyond the daylight hours, adding to the danger tremendously. AccuWeather's Bernie Rayno breaks down what to expect.

A powerful storm system is set to bring multiple rounds of dangerous severe thunderstorms, with numerous strong tornadoes possible, from the Midwest to the Southeast beginning Friday. Threat level: A total of about 100 million people live in areas under threat from straight-line wind damage,