Flash Flood in New Jersey
Every flash flood event the National Weather Service has filed in New Jersey, year by year, with the most significant episodes. Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
The most significant on the map
The most significant flash flood episodes in New Jersey.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The record
- Events
- 1,846
- Deaths
- 40
- Injuries
- 203
- Damage
- $1.2 billion
Every year
The most significant
Ranked by deaths, injuries, damage and size together.
- Flash Flooding in New Jersey, September 1 to 2, 2021Post Tropical Cyclone Ida brought heavy rain to New Jersey on September 1. Rainfall totals were as high as 5 to 10 inches. The heavy rain caused significant flash flooding, mainly in the northern half of the state. It resulted in widespread property damage.
- Hurricane and Tropical Storm in New Jersey, September 16 to 23, 1999Hurricane Floyd battered New Jersey (especially the central and northern thirds) on September 16th and brought with it torrential and in some areas, unprecedented and record breaking rains and damaging winds.
- Flash Flooding and Flooding in New Jersey, September 1 to 3, 2021Extremely heavy rainfall associated with the remnants of Hurricane Ida overspread northeast New Jersey during the evening of September 1 and continued through the early morning hours of September 2.
- Tornado and Tropical Storm in New Jersey, August 27 to 31, 2011Irene produced torrential downpour rains that resulted in major flooding and a number of record breaking crests on area rivers, tropical storm force wind gusts with record breaking outages for New Jersey utilities, one confirmed tornado and a three to five foot storm surge that…
- Flash Flooding in New Jersey, September 16 to 17, 1999Torrential record rainfall, which caused serious widespread urban, small stream, and river flooding, preceded the remnants of Hurricane Floyd, which passed over Western Suffolk County of Long Island from 7 pm to 9 pm on September 16th.Deaths: Flooding caused 3 deaths: 2 in…
- Flash Flooding and Flooding in New Jersey, August 14 to 19, 2011A series of thunderstorms preceding a cold front dropped three to seven inches of rain across a wide swath of New Jersey (less along most of the coast) from overnight on the 13th into the day on the 14th.
- Flash Flooding in New Jersey, July 14, 2025A weak front approached from the west along with PW of 2 inches resulting in heavy rainfall across the area. 4 to 6.5 inches of rainfall totals were reported with rainfall rates between 1 to 2 inches.
- Flash Flooding and Hail in New Jersey, July 26, 2009A pre-frontal trough followed by a potent cold front caused multiple severe thunderstorms some of which produced flash flooding across Northeast New Jersey.
- Flash Flooding in New Jersey, August 12 to 17, 2000A nearly unprecedented thunderstorm with torrential downpour remained nearly stationary for about six hours from 9 a.m. EDT through 3 p.m. EDT on August 12th over the Hamburg Mountains of eastern Sussex County.
- Flash Flooding and Flooding in New Jersey, July 30 to 31, 2016Several clusters of thunderstorms associated with several shortwaves and a cold front became nearly stationary over Mercer County on the 29th and Hunderdon County on the morning of the 30th. Heavy rainfall over 5 inches occurred in these areas.
- Flash Flooding and Flooding in New Jersey, July 13 to 17, 2017A hot and humid airmass was present ahead of a frontal boundary which slowly moved southeast toward and then through the state. Several rounds of thunderstorms moved through the region ahead of this front over the course of a few days. 2,800 people lost power in Ocean county.
- Tropical Storm and Flash Flooding in New Jersey, July 10, 2020Tropical Storm Fay moved northward along the coasts of Delaware and New Jersey on the afternoon and evening of July 10. The storm produced rainfall totals up to 3 to 6 inches in New Jersey, with the highest totals occurring in the southern part of the state.
- Flash Flood in New Jersey, August 20 to 21, 1997Torrential rain fell across southeast New Jersey as a low pressure system developed over the Delmarva Peninsula and slowly moved northeast across southern New Jersey.
- Flash Flood and Flood in New Jersey, July 12 to 16, 2004During the late afternoon and evening of the 12th, thunderstorms with torrential downpours kept on redeveloping along the Interstate 295 corridor in southern Burlington County and moved east.
- Flash Flood in New Jersey, October 19, 1996Rain, very heavy at times around noon on the 19th caused widespread and severe flooding throughout Somerset County. For the major rivers, most of the crests were the second highest on record and represented a 25 to 50 year flood.
- Flash Flood and Flood in New Jersey, September 18 to 20, 2004The remnants of Hurricane Ivan interacting with a slowly moving cold front caused widespread very heavy rain to fall during the first half of the day on the 18th in Warren County. Storm totals average 3 to 6 inches with locally higher amounts throughout the county.
- Flash Flooding and Flooding in New Jersey, September 5 to 14, 2011The remnants of Tropical Storm Lee that interacted with a stalled frontal boundary produced several days with periods of heavy rain across New Jersey from the 5th into the 8th.
- Flash Flooding and Damaging Wind in New Jersey, July 8, 1996Clusters of strong thunderstorms developed in a moist unstable airmass ahead of a slow moving cold front.Thunderstorms produced torrential rain, frequent lightning, and gusty winds.
- Flash Flooding in New Jersey, June 15, 2015A wave of low pressure passed to the south of the Tri-State Area along a frontal boundary, which brought heavy rain to the region and resulted in isolated flash flooding in Passaic and Union Counties.
- Flash Flood in New Jersey, June 24, 2006A man fell into a swiftly flowing tributary of the Passaic River around 8 pm EDT and was killed. Heavy rains of up to 3 inches had fallen in the area during Friday and Saturday (the 23rd and 24th) which caused the stream to run more swiftly than normal.
- Flash Flooding in New Jersey, October 19 to 20, 1996On Friday October 18th, a strong low pressure system developed on a cold front over the DelMarVa Peninsula.
- Flash Flood and Flooding in New Jersey, October 13 to 14, 2005Heavy rain associated with a low pressure system southeast of New Jersey moved into Monmouth County on the 13th. Three day storm totals (from the 11th through the 14th) in the county averaged between four and eleven inches with the highest amounts near the coast.
- Flash Flood in New Jersey, July 17 to 18, 2005Thunderstorms with torrential downpours caused flash flooding in the Manalapan Brook basin in southeastern Middlesex County as a Doppler Radar estimated storm totals of between 6 and 8 inches fell over the basin.
- Flash Flooding in New Jersey, August 11, 2018A stalled stationary boundary within a very moist airmass provided a focusing mechanism for several rounds of heavy rain that resulted in widespread flash flooding across northeast New Jersey.
- Flash Flood in New Jersey, June 12 to 13, 1996Nearly stationary thunderstorms dropped between 3.5 and 7.6 inches of rain within four hours in western Mercer County. This caused widespread flash flooding throughout the area. Nearly every roadway was flooded.
More
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.