BBC:
More than 120 million Americans woke to severe weather warnings on Monday, after huge storms killed at least 23 people and left a path of destruction across central US.
Tornadoes and devastating thunderstorms left nearly 600,000 residents in 13 states without power, obliterated homes and injured hundreds.
Forecasters said the greatest weather risk will now shift east, covering a broad sweep of the country, from Alabama to New York.
More thunderstorms, damaging wind gusts, hail and flash flooding are expected.
