A widespread area of showers and thunderstorms that currently extends from the DC metro region all the way down to Georgia is riding right up the east coast. A strong southerly flow of air sandwiched between high pressure off the east coast and an inland upper level low pressure trough is pumping tropical moisture right up the eastern seaboard from the Gulf of Mexico. This “wall of water” will hit the DC region shortly with showers and embedded thunderstorms and some of the rain will be heavy at times, and the threat for rain will last for a few hours. The Philly metro region should be affected by this impressive batch of rainfall during the evening hours with the heaviest rain likely on the eastern side I-95. New York City and New England will get their turn with this area of rain later tonight. Flash flooding will no doubt be a significant concern in many Mid-Atlantic locations over the next several hours given the already well-saturated grounds and the additional heavy rainfall that will fall.