169
Recorded events
0
Direct deaths
0
Direct injuries
$19.2M
Property damage
Flash Flood in Nassau County, New York: 169 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #58 nationally and #4 statewide for this hazard.
Decade by decade
Flash Flood in Nassau County, New York: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Nassau County is the 2020s, when 59 of the county's 169 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 Nassau County archive, flash flood makes up 29.0% of all recorded severe weather across 13 hazard types. Nationally the county sits at #58 for this hazard and #4 within New York, putting it in the 98.1 percentile of all U.S. counties.
Seasonality
Events by month
Aug is the peak month for flash flood in Nassau County with 61 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 |
|---|---|---|---|
| Jul 31, 2025 | NORTH WANTAGH | 0 | $0 |
| Jul 31, 2025 | HARBOR HILLS | 0 | $0 |
| Aug 19, 2024 | JERICHO | 0 | $0 |
| Aug 19, 2024 | JERICHO | 0 | $0 |
| Aug 19, 2024 | MUTTONTOWN | 0 | $0 |
| Aug 6, 2024 | LOCUST VLY | 0 | $0 |
| Aug 6, 2024 | GLEN COVE | 0 | $0 |
| Jan 10, 2024 | GREAT NECK | 0 | $0 |
| Jan 10, 2024 | NASSAU SHRS | 0 | $0 |
| Jan 10, 2024 | MUNSEY PARK | 0 | $0 |
Other hazards here
More from Nassau County
- Thunderstorm Wind 246
- Hail 81
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Flash flooding resulted in an estimated $7,956,143 in damages across Nassau 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.
Extensive flood damage was reported at the One Offering Tabernacle of God Church on Clinton St. in Hempstead. The church's organ, van, printers, furniture, religious artifacts, robes and several computers were destroyed. Several other vehicles in the church's parking lot were also damaged by flood waters. Numerous residents of Lido Beach, Long Beach and E. Atlantic Beach also sustained damage from flood waters entering their homes. National Blvd. was underwater, while Loop Pkwy. and portions of Lido Blvd. were closed due to flooding. Property damage amounts are estimated.
All lanes were closed in both directions on Interstate 495 in Roslyn Heights from Searingtown Rd. to Glen Cove Rd. with motorists being rescued from high water by the local fire department. In the Herricks section of New Hyde Park, torrential rain caused severe flooding on Allen Street. Four to five feet of water accumulated on parts of the street causing a foundation wall of one house to collapse, rupturing the gas main. Approximately 30 homes had to be evacuated as a result of this. Three homes on Allen St. were condemned as unsafe to inhabit due to cracks or partial collapse of their foundation walls. Property damage amounts are estimated.
Quick answers
Frequently asked
How many flash flood events are on record in Nassau County, New York?
169 flash flood events are recorded in Nassau County between 1996 and 2025, causing 0 direct deaths.
What is the strongest flash flood recorded in Nassau County?
The strongest flash flood on record in Nassau County measured 0.
Where does the flash flood data for Nassau 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 Nassau County, New York.” Severe Weather History. severeweatherhistory.com/county/new-york/nassau-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.