New rounds of severe thunderstorms and life-threatening, potentially catastrophic, flooding risks are brewing in the central and eastern United States Tuesday, putting more than 50 million people at risk this week.

At least one person has died in southwest Oklahoma after flash flooding hit the region, with authorities warning people to stay off the roads as severe weather warnings continue.

Heavy rain and flooding risks rise across central and southern Illinois, Metro East, and St. Louis as showers continue after a two-day severe storm outbreak.