At least five people have been killed in a monster storm sweeping across much of the U.S. At least two people were killed in Missouri after a tornado struck the Bakersfield area.

A powerful storm dropping drenching rain on flood-prone Southern California is raising concern among forecasters that it could produce a dangerous, widespread outbreak of tornadoes, damaging winds and fires along with a blizzard as it crosses the entire United States in the coming days.

The National Weather Service warned of extreme weather across a vast swath of the country that is home to more than 100 million people.