( CNN ) -- [ Breaking news update at 2:05 a.m . ET ] . ( CNN ) -- A tornado touched down in Golden City , Missouri , early Monday morning and tore through two counties , Barton County Emergency Management Director Tom Ryan said . The number of injuries and extent of damage were not immediately clear . [ Breaking news update at 1:56 a.m . ET ] . ( CNN ) -- Two people missing from a trailer park in central Oklahoma have been found , Pottawatomie County Sheriff Mike Booth said . The two residents were not there when a tornado devastated Steelman Estates , destroying homes . [ Earlier story , updated at 11:25 p.m . ET ] . Four-state tornado outbreak kills 1 . ( CNN ) -- At least one person was killed and around a dozen injured Sunday when a string of tornadoes tore through four states , ripping roofs off homes , downing power lines and tossing trees like matchsticks . The death happened at a trailer park in Pottawatomie County , Oklahoma , said Sheriff Mike Booth . He had no details , other than that the deceased was an adult male . Rescue crews were picking through the mangled metal remains of mobile homes as darkness fell Sunday . As many as 26 tornadoes were reported in Oklahoma , Kansas , Illinois and Iowa , according to the National Weather Service , with Oklahoma and Kansas being the hardest hit . Some of those reports might have been of the same tornado . Oklahoma Gov . Mary Fallin declared a state of emergency for 16 counties . One tornado touched down near Wellston , Oklahoma , taking out power lines and damaging several homes , according to video from CNN affiliate KFOR . The affiliate 's helicopter pilot estimated the funnel cloud to be about a half-mile wide . `` It 's tearing up everything , '' the pilot said . `` Just ripping everything up in its sight . '' Aerial video from KFOR and CNN affiliate KOCO showed severe damage near Wellston and near Carney , Oklahoma . Roofs were ripped from homes , branches stripped from trees and roads were filled with debris . Tornadoes were also reported east of Dale , west of Paden , and near Prague in Oklahoma . Part of Interstate 40 in Shawnee , Oklahoma , was shut down in both directions Sunday night after a tornado touched down there , overturning multiple tractor-trailers . Eleven patients were being treated at St. Anthony Shawnee Hospital in Shawnee , Oklahoma , said spokeswoman Carla Tollett . Ten were not critical and will be released , while one remains in critical condition , she said . Still more tornadoes were spotted in Iowa , near Earlham , Huxley and east of Dallas Center , according to the weather service . It did not mince words , telling people to take cover there , as elsewhere . `` You could be killed if not underground or in a tornado shelter . Complete destruction of neighborhoods , businesses and vehicles will occur . Flying debris will be deadly to people and animals , '' it said in a Kansas advisory . The twisters are part of a severe weather outbreak that is sweeping through the region as storms move east . Baseball-sized hail , wind gusts and tornadoes are threatening to pummel parts of the central Plains and Midwest through Monday . `` We still have a couple of active cells , and so we do n't know for sure that it 's over yet , '' said Jerry Lojka with the Oklahoma Department of Emergency Management . Beyond the Midwest , other areas saw severe weather on Sunday . In Atlanta , serious flooding was reported amid storms producing heavy rainfall . Here 's a quick look at CNN meteorologist Melissa Le Fevre 's forecast for Monday for hard-hit Midwestern states : . Kansas . The surface front may stall on Monday , leading to showers and thunderstorms through the day . Localized heavy rainfall may lead to the need for flood watches and warnings . Oklahoma . There is a threat for strong storms in the late afternoon . With the heavy rain that will occur through the weekend , flooding could become a problem Monday night . Iowa . Showers and storms are expected to develop on Monday afternoon . Large hail is possible and though the tornado threat looks low , it can not be ruled out . Missouri . Flooding is expected to become an issue after localized heavy rainfall . Afternoon storms could produce large hail , damaging wind gusts and possible tornadoes . In St. Louis , storms will reorganize during the afternoon and evening hours . Threats include large hail , damaging winds and the possibility of tornadoes . CNN 's Nick Valencia , AnneClaire Stapleton , Sean Morris , Jackie Castillo and Alexandra Steele contributed to this report .
NEW : A tornado strikes Missouri early Monday , a county official says . `` We do n't know for sure that it 's over yet , '' says an official . Tornadoes tear through Oklahoma , Kansas , Illinois and Iowa . One person is killed in Pottawatomie County , Oklahoma .