91
Recorded events
0
Direct deaths
2
Direct injuries
$19.6M
Property damage
Flash Flood in Monmouth County, New Jersey: 91 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #209 nationally and #8 statewide for this hazard.
Decade by decade
Flash Flood in Monmouth County, New Jersey: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Monmouth County is the 2020s, when 39 of the county's 91 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the Monmouth County archive, flash flood makes up 12.5% of all recorded severe weather across 12 hazard types. Nationally the county sits at #209 for this hazard and #8 within New Jersey, putting it in the 93.2 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for flash flood in Monmouth County with 35 recorded events, while Feb is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Jan 3, 1999 | NORTHEAST PORTION | 0 | 0 | 2 | $0 |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Sep 6, 2025 | SHREWSBURY | 0 | $10K |
| Sep 6, 2025 | EAST LONG BRANCH | 0 | $0 |
| Jul 31, 2025 | KEYPORT | 0 | $0 |
| Jul 20, 2025 | SEA GIRT | 0 | $0 |
| Jul 15, 2025 | EAST KEANSBURG | 0 | $0 |
| Jul 1, 2025 | NEPTUNE CITY | 0 | $30K |
| Jul 1, 2025 | BRIELLE | 0 | $0 |
| Jul 1, 2025 | BRADLEY BEACH | 0 | $30K |
| Aug 6, 2024 | ENGLISHTOWN | 0 | $0 |
| Aug 6, 2024 | OCEAN GROVE | 0 | $0 |
Other hazards here
More from Monmouth County
- Thunderstorm Wind 385
- Hail 78
- Lightning 64
- Heavy Rain 48
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Thunderstorms with torrential downpours caused flash flooding of roadways and creeks, especially in the eastern half of Monmouth County. Sections of New Jersey State Routes 35 and 71 were flooded and closed. Roadway closures occurred in Ocean Township, Long Branch, Manasquan, Deal, Wall and Neptune. Several dozen vehicles became struck in flood waters. In Long Branch, a mother and her nine-month-old son were rescued from a vehicle on Long Branch Avenue. Three other roadways were flooded. In Ocean Township, secondary roadways took a big flooding hit. In Manasquan, basement flooding occurred along Marcellus Avenue. Event precipitation totals included 4.11 inches in Ocean Township, 2.85 inches in Fair Haven, 2.68 inches in Red Bank, 2.57 inches in Rumson and 2.16 inches in Long Branch.
Thunderstorms with torrential downpours caused flash flooding in Deal. Numerous roadways were flooded. Both Norwood Avenue (New Jersey State Route 71) were flooded and impassable near the Poplar Brook. Heavy rain did cause additional poor drainage flooding in eastern Monmouth County. Event precipitation totals included 5.91 inches in Manasquan, 4.94 inches in Wall Township, 4.76 inches in Neptune City, 4.59 inches in Belmar, 4.56 inches in Sea Girt, 4.25 inches in Long Branch, 3.98 inches in Eatontown, 3.84 inches in Ocean Township and 3.12 inches in Howell Township.
Thunderstorms with torrential downpours caused poor drainage and small creek flash flooding in southeastern Monmouth County in Wall and Howell Townships. New Jersey State Route 35 was flooded in Wall Township between New Jersey State 138 and the Shark River Bridge. Doppler Radar storm total estimates reached 6 inches and 5.91 inches of rain was measured in Howell.
Quick answers
Frequently asked
How many flash flood events are on record in Monmouth County, New Jersey?
91 flash flood events are recorded in Monmouth County between 1996 and 2025, causing 0 direct deaths.
What is the strongest flash flood recorded in Monmouth County?
The strongest flash flood on record in Monmouth County measured 0.
Where does the flash flood data for Monmouth County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flash Flood in Monmouth County, New Jersey.” Severe Weather History. severeweatherhistory.com/county/new-jersey/monmouth-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.