What is the current impact of the powerful storm system that hit the southeast?

The storm system has caused devastating consequences across the southeastern United States, with the death toll rising to at least 15 people across several states. Millions of residents are now facing new threats as relentless rainfall has completely submerged entire neighborhoods underwater. The situation remains critical as communities deal with the immediate aftermath of flash flooding while simultaneously preparing for additional weather hazards, including the potential for bitter cold conditions that could follow the storm system.