The flash flood threat could impact millions across the Mid-Atlantic and Northeast, including major urban centers like Washington, D.C., and Raleigh, North Carolina. Low-lying areas, urban zones, and regions with poor drainage are particularly vulnerable. The heavy rainfall may exacerbate existing drought conditions by causing rapid runoff instead of replenishing groundwater. Travel disruptions, property damage, and localized flooding are likely in affected areas. Residents in these regions should remain vigilant as the situation develops.