"The damage is widespread and devastating. Our focus remains on search and rescue," Governor Earl Ray Tomblin told a news conference after floods caused by a day of heavy rains.
"I had planned to fly around the affected areas myself today but wasn't able to because all state aircrafts are currently being used for rescues," he said.
The dead included an eight-year-old boy who was swept away while walking along a creek bank with his mother and sister, WSAZ reported. His body was found after three hours of searching.
About 200 national guard members had fanned out in eight counties to assist local responders and 17 shelters were open for those whose homes were damaged or destroyed.
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About 500 people were stranded overnight inside a shopping mall in Elkview, near the capital Charleston, after a bridge leading to the main road was washed away, ABC News reported.
News station WCHS/WVAH posted a video on its Instagram account showing a house in flames being carried away by muddy floodwaters in the small city of White Sulphur Springs.
Another set of photos showed a woman who had caught a giant trout with her hands while standing on a two-lane road amid stopped traffic.