Tornadoes may hit the Mississippi Valley on Friday, as well as blizzards in the northern Plains and gusty conditions in Texas that pose a high risk of wildfires.

Strong storms are heading to the Upstate, the National Weather Service says, and tornadoes could spin out of them.

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,