ATLANTA (AP) — More than 15 million people from Texas to Florida were under threat of severe storms and the potential for more tornadoes Monday, many of them in areas previously hit during one of the most active periods for twisters on record. At highest risk for severe storms and tornadoes was a zone stretching from southeast Texas through much of Louisiana and the Gulf Coast regions of Mississippi and Alabama, and to the Florida Panhandle, according to the national Storm Prediction Center. Some of the worst weather around midday Monday was in the Florida Panhandle, where a tornado watch was in effect. Roads flooded and stalled vehicles in Escambia County, the National Weather Service reported. There were also flash flood warnings for Alabama’s Gulf Coast, where more than 3 inches (7.6 centimeters) of rain had fallen. More than 90,000 homes and businesses lacked power across the South on Monday afternoon, with most of them in Florida, Alabama and Mississippi, according to PowerOutage.us.