A multiday severe weather outbreak could blast cities across the central and eastern U.S. with thunderstorms capable of producing large hail and potential tornadoes.

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,