JACKSON, Miss. - A large storm system packing high winds, thunderstorms and the threat of tornadoes is continuing its sweep across several Southern and central U.S. states.

Emergency management officials say the large storm front blacked out thousands in Arkansas and has caused scattered power outages in northern Mississippi. At least one person was reported injured by lightning in Arkansas.

Jeff Rent at the Mississippi Emergency Management Agency urged residents to be on guard for severe thunderstorms, high winds and possible twisters. Tennessee and other states also were on guard Wednesday.

Rent says some houses have been damaged and trees and power lines felled as the brunt of the storm was felt in four Mississippi counties overnight. The storm is set to sweep toward the Eastern seaboard in coming hours.