( CNN ) -- Emergency teams on Sunday were assessing damage from deadly storms that devastated parts of Missouri , Kentucky and West Virginia this weekend -- even as the threat of more severe weather continued . West Virginia Gov . Joe Manchin tours Mingo County to assess damage caused by extensive rain and flooding . The storm that tore through Madison County , Kentucky , on Friday was a category EF-3 tornado , the National Weather Service said Sunday . An EF-3 is the third-strongest category of tornado , with winds of 136 to 165 mph , strong enough to destroy large buildings and lift cars off the ground . At least one person was killed by that storm , with several other serious injuries . A waste water treatment plant was destroyed , two fire departments sustained major roof damage and some manufacturing facilities were damaged , local authorities said . Three people were killed in southern Missouri during high winds , thunderstorms and flash floods . A couple was killed when a tree fell on their car on a highway near Poplar Bluff . A man died of a heart attack near Springfield when winds tossed him and his wife into an open field , officials said . A weekend of storming in West Virginia destroyed as many as 400 buildings and severely damaged an additional 1,000 , said Rob Jelacic of the West Virginia Office of Emergency Services . `` We are in recovery mode , '' Jelacic said Sunday . There were no known deaths in West Virginia from the storms . After the storms came floods . On Sunday , parts of the Meramec and Big rivers were rising feet above flood levels , causing residents already hit by the storms to seek higher ground . Forecasters expected the Meramec to crest Monday 4 to 8 feet above flood state in St. Louis County . The big river was expected to crest a half-foot higher on Monday than it did Sunday .
Tornado hits Virginia with up to 165 mph winds , kills one . Three killed in southern Virginia during high winds , thunderstorms , flash floods . One dies of a heart attack after winds push him and his wife into an open field . Hurricane in West Virginia destroys 400 buildings , severely injuring an 1,000 .