A tornado in Atlanta forced thousands to seek shelter, and one man was killed when a falling tree brought power lines onto his vehicle.
California Gov. Gavin Newsom delivered the news while standing in a lake basin that would normally be under water.
Arizona and Nevada could see their first mandatory water use caps as climate change leaves the Colorado River at a historic low.
The deadly floodwaters follow Nashville's second-highest two-day rainfall total. Authorities have urged residents to stay home and not drive through the water.
At one point, an entire tree blows past the vehicle.
The swath of violent weather also toppled trees, demolished homes and knocked out power to thousands.
The biggest overnight threat of tornadoes remained over Alabama, according to the National Weather Service.
Severe weather is expected to sweep from the Rockies to the Mississippi River Valley in the next few days.
It’s only going to get worse with the increased demands of extreme weather triggered by climate change, he warned.
Electricity price-gouging in storm-struck Texas is just a glimpse of the nation’s looming utility debt crisis.