Lynn Champagne of E.C.O. Builders surveys the damage after the building was struck by an apparent tornado in south Slidell, La., April 10. Photo: Scott Threlkeld/The Times-Picayune/The New Orleans Advocate via AP

ATLANTA—Powerful storms rumbled over parts of the U.S. Southeast on April 11, prompting a few tornado warnings, causing flash flooding, and delaying the start of one of the world’s biggest sporting events, in Georgia.

The storm system, which has already been blamed for at least one death in Mississippi, demolished buildings and flooded streets in the New Orleans area April 10. It continued to spawn flash flood and tornado warnings in Florida, Georgia and South Carolina on April 11.

More than 100,000 customers lacked power the afternoon of April 11 nationwide. That included more than 60,000 in Louisiana, which was hit hard by storms on April 10, according to PowerOutage.us.

The entire state of Ohio was under a flood watch the afternoon of April 11. Public school students in at least a dozen counties in West Virginia were sent home early April 11 due to the arriving storms. Southern West Virginia was hit by 10 tornadoes April 2. It was a record for one day in the state, which gets two tornadoes in an average year.

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Torrential rains early April 11 made roads impassable in Valdosta, Georgia, an emergency manager reported. In Tallahassee, Florida, storms toppled trees and caused significant street flooding, the weather service said. Storm damage had been reported from Texas to the Florida Panhandle. (AP)