A hazardous meteorological situation is developing across the Mid-Atlantic and Carolinas as a stationary cold front merges with moisture from Tropical Storm Bertha. Meteorologists caution that persistent heavy rainfall and sluggish thunderstorms may result in life-threatening flash floods until Saturday. Areas in North Carolina, such as Raleigh and the Outer Banks, are under a Level 3 flood threat, with millions still subject to severe weather warnings. Authorities are advising residents to remain vigilant as flooding and damaging storms are expected to escalate.