New Jersey Severe Flash Flood Warning | Effective 07/21/2026 05:49

Headline: 
Flash Flood Warning issued July 21 at 8:49AM EDT until July 21 at 1:00PM EDT by NWS Mount Holly NJ
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
July 21, 2026 - 5:49am
Expires: 
July 21, 2026 - 10:00am
Description: 
FFWPHI The National Weather Service in Mount Holly has issued a * Flash Flood Warning for... Southwestern Sussex County in northwestern New Jersey... Northern Warren County in northwestern New Jersey... * Until 100 PM EDT. * At 849 AM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.5 and 1.5 inches of rain have fallen. The expected rainfall rate is 1 to 2.5 inches in 1 hour. Additional rainfall amounts of 0.5 to 1.5 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Flooding of small creeks and streams, urban areas, highways, streets, and underpasses as well as other drainage and low lying areas. * Some locations that may experience flash flooding include... Newton, Blairstown, Franklin, Ogdensburg, Hope, Andover, Greendell, Allamuchy-Panther Valley, Great Meadows-Vienna, Lake Mohawk, Columbia and Portland. This includes Interstate 80 in New Jersey between mile markers 3 and 18.
Instruction: 
Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Area Description: 
Sussex, NJ; Warren, NJ
Forcast Office: 
NWS Mount Holly NJ