A massive storm system is sweeping across the U.S., with flash flood warnings already in effect for parts of Georgia and Tennessee. Approximately 120 million Americans in 23 states are expected to be impacted by the weather event, which is forecast to bring heavy downpours and severe conditions through Saturday.

In the Southeast, several inches of rain have already led to evacuations in Fannin County, Georgia, and Polk County, Tennessee, as waterways overflowed. The National Weather Service described the situation as "particularly dangerous" and urged residents to seek higher ground immediately due to the risk of life-threatening flash flooding.

The low-pressure system is anticipated to move into the Mid-Atlantic and Northeast regions throughout Thursday, with thunderstorms expected in the Carolinas and steady rain from Virginia to Maine. Meteorologists warn that the rainfall, even if not torrential, could create hazardous driving conditions on slick roads, especially after dry periods.

Dangerous flooding is predicted for multiple coastal cities along the East Coast, including parts of eastern Virginia, Delaware, southern New Jersey, the New York City metropolitan area, Connecticut, Rhode Island, and Boston, Massachusetts. The storm is expected to cause significant travel disruptions through the weekend.