Tens of millions across Northeast under flood alerts

Tonight, new surveillance video shows the moment the roof of a wholesale club collapsed, sending shoppers running for their lives and a wall of water and debris crashing down in Monmouth County, New Jersey. >> People started screaming. It was just pandemonium.>> According to the sheriff, incredibly, no one was injured. The club the latest casualty of a summer of severe weather. And tonight, the threat is far from over.Tens of millions across the Northeast on flood alert as torrential rain sends water surgin ...