New rounds of severe thunderstorms are underway 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 of dangerous weather this week.

After severe thunderstorms moved across Oklahoma overnight, more severe weather is expected Tuesday. Here's what we know.

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.