234
Recorded events
0
Direct deaths
0
Direct injuries
$50.1M
Property damage
Flash Flood in Suffolk County, New York: 234 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #29 nationally and #1 statewide for this hazard.
Decade by decade
Flash Flood in Suffolk County, New York: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Suffolk County is the 2010s, when 88 of the county's 234 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 Suffolk County archive, flash flood makes up 27.0% of all recorded severe weather across 12 hazard types. Nationally the county sits at #29 for this hazard and #1 within New York, putting it in the 99.1 percentile of all U.S. counties.
Seasonality
Events by month
Aug is the peak month for flash flood in Suffolk County with 119 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.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Aug 1, 2025 | SHIRLEY ARPT | 0 | $0 |
| Jul 31, 2025 | HAGERMAN | 0 | $0 |
| Jul 31, 2025 | HOLBROOK | 0 | $0 |
| Jul 31, 2025 | BOHEMIA | 0 | $0 |
| Jul 31, 2025 | OAKDALE | 0 | $0 |
| Jul 31, 2025 | WEST SAYVILLE | 0 | $0 |
| Jul 31, 2025 | WEST SAYVILLE | 0 | $0 |
| Aug 19, 2024 | ST JAMES | 0 | $0 |
| Aug 19, 2024 | STONY BROOK | 0 | $500K |
| Aug 19, 2024 | BARNES HOLE | 0 | $0 |
Other hazards here
More from Suffolk County
- Thunderstorm Wind 398
- Hail 107
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
The Sagtikos Parkway southbound was closed at Exit S2, Crooked Hill Rd., in Brentwood due to flooding. Storm total rainfall amounts reported in Suffolk County ranged from 0.14 inches in Montauk to 13.27 inches at Islip/MacArthur Airport with a 24 hour rainfall record of 13.78 inches at MacArthur Airport which broke the New York State record. Damage amounts are validated costs of damage assessment inspections of municipal property, $11.7 million, and $23.5 million for small business administration loans as a result of the FEMA private property and business damage assessment. This information was provided by the Suffolk County Office of Emergency Management.
Flash flooding resulted in an estimated $3,234,712 in damages across Suffolk County. This estimate is based on FEMA grant money awarded under the Individuals and Household Program (IHP), which includes funds for both housing assistance and other needs.
The Nissequogue River dam broke due to the flash flooding causing the entire Blydenburgh Pond to empty into the river. The river overflowed its banks, sending water into homes and nearby streets. Two residents were trapped in their homes and had to be rescued.
Quick answers
Frequently asked
How many flash flood events are on record in Suffolk County, New York?
234 flash flood events are recorded in Suffolk County between 1996 and 2025, causing 0 direct deaths.
What is the strongest flash flood recorded in Suffolk County?
The strongest flash flood on record in Suffolk County measured 0.
Where does the flash flood data for Suffolk 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 Suffolk County, New York.” Severe Weather History. severeweatherhistory.com/county/new-york/suffolk-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.