At least seven people have died after tornadoes and violent winds ripped through the US South, as a series of storms expected to continue for days takes hold.
Deaths were recorded in western Tennessee, Missouri and Indiana on Wednesday and Thursday, in areas where homes were flattened and debris flew miles-high.
The toll could rise in what the National Weather Service described as "once-in-a-generation" storms in flood warnings issued on Thursday.
Dozens of severe weather alerts, including tornado watches and flash flood warnings, have been issued from Texas to Pennsylvania.
The storm system will threaten "significant, life-threatening flash flooding" until Saturday, the NWS said.
On Thursday, tornado warnings - the highest level alert - were issued in parts of Texas, Louisiana and West Virginia, with tornado watches in parts of Arkansas, Mississippi, Kentucky and Tennessee.
Flash flood warnings were also in effect in Mississippi, Tennessee and Kentucky - where states of emergency have also been declared - and West Virginia.
Bulldozers have already been deployed in many of these areas, clearing mounds of debris and rubble amid downed powerlines.
Early NWS reports estimate wind speeds up to 160mph (241km/h) in Selmer, in south-west Tennessee.
"Don't let your guard down," Tennessee Governor Bill Lee warned on Thursday. At least five people have been killed there, including a man and his teenaged daughter.
Up to 15in (38cm) of rain is expected to fall in parts of the state by the time the storms pass. Officials say the rainfall risks overflowing Tennessee's riverbanks.
Ray Garcia, chief deputy of the Fayette County Sheriff's Office, told the Associated Press: "It looks like a swimming pool in my front yard."
President Donald Trump has approved an emergency declaration for Tennessee, clearing the way for federal assistance.
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