CUMMING — After spending 35 years on Atlanta TV warning viewers what not to do in a storm, retired meteorologist and Forsyth County resident Ken Cook had a chance to put his own advice into practice during a recent thunderstorm. Cook said he was at his Lake Lanier home on Sept. 3 when a strong storm blew through. “It’s scary,” he said. “ ... It was so dark, the rain was so heavy we couldn’t see out to the dock.