New Castle County, Delaware — Heavy thunderstorms are dropping intense rain across the Delaware Valley this afternoon, and the National Weather Service in Mount Holly, New Jersey has issued a Flash Flood Warning until 6:30 PM EST for northeastern New Castle County in Delaware, northwestern Gloucester County and northwestern Salem County in New Jersey, and southwestern Delaware County in Pennsylvania.

What is happening:

At 2:26 PM EST, Doppler radar showed thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have already fallen, and rain is coming down at a rate of 1.5 to 2.5 inches per hour. Another 1 to 2 inches of rain are possible. Flash flooding is ongoing or expected to begin shortly.

Local impacts:

Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses, as well as other poor drainage and low-lying areas.

What to do:

Turn around, do not drown when you come to a flooded road. Most flood deaths happen in vehicles.

Never drive through flooded roadways or around barricades.

If you see water rising around you, get to higher ground immediately.

Avoid underpasses and low-lying roads during heavy rain.

Source: National Weather Service, Mount Holly, New Jersey, November 12, 2026.