The US National Weather Service’s Weather Prediction Center placed much of the Mid-Atlantic’s I-95 corridor under a Moderate Risk—Level 3 on the agency’s four-tier scale—for excessive rainfall on Monday. The advisory covers major population centers from Washington, D.C. through Baltimore and Philadelphia, as well as surrounding areas of Virginia, Maryland, Delaware and New Jersey. Slow-moving thunderstorms are expected to drop rain at rates of 2–3 inches an hour beginning Monday afternoon, a pace the WPC says could trigger “numerous” flash floods and, in isolated spots, produce locally catastrophic conditions. Meteorologists warned that urban drainage systems could be overwhelmed quickly, while smaller streams may rise rapidly. Flash-flood watches are in effect from the Blue Ridge and Piedmont regions of Virginia northward to Trenton, N.J. The NWS urged residents to monitor updated warnings and avoid driving across flooded roads. Monday’s alert follows a similar Moderate Risk issued for the region less than a week ago, underscoring an active, moisture-laden pattern in the Mid-Atlantic.