7/31/2025 4:12:00 PM until 7/31/2025 6:45:00 PM

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

At 412 PM EDT, emergency management reported thunderstorms producing heavy rain across the warned area. Several roads are closed in Potomac due to flooding. Between 2 and 4 inches of rain have fallen. The expected rainfall rate is 2 to 3 inches in 1 hour. Additional rainfall amounts up to 1.5 inches are possible in the warned area. Flash flooding is ongoing. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Emergency management reported. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. Some locations that will experience flash flooding include... Rockville... Bethesda... Reston... Lowes Island... Potomac... North Bethesda... Great Falls... Darnestown... Cabin John... Bradley Farms... Congressional Manor... This includes the following Flood Prone Roads... River Rd at Cabin John Creek west of the Beltway.