72
Recorded events
0
Direct deaths
0
Direct injuries
$755K
Property damage
Flash Flood in St. Mary's County, Maryland: 72 recorded events between 1996 and 2022. The strongest on record measured 0. That places the county #322 nationally and #8 statewide for this hazard.
Decade by decade
Flash Flood in St. Mary's County, Maryland: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in St. Mary's County is the 2010s, when 29 of the county's 72 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 St. Mary's County archive, flash flood makes up 11.1% of all recorded severe weather across 9 hazard types. Nationally the county sits at #322 for this hazard and #8 within Maryland, putting it in the 89.6 percentile of all U.S. counties.
Seasonality
Events by month
Aug is the peak month for flash flood in St. Mary's County with 22 recorded events, while Mar 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 26, 2022 | GREAT MILLS | 0 | $0 |
| Jul 25, 2022 | LNRDTWN ST MARYS ARP | 0 | $0 |
| Jul 25, 2022 | LNRDTWN ST MARYS ARP | 0 | $0 |
| Jul 25, 2022 | GREAT MILLS | 0 | $0 |
| Jul 9, 2022 | LEONARDTOWN | 0 | $0 |
| Jul 9, 2022 | CHAPTICO | 0 | $0 |
| Jul 9, 2022 | ABELL | 0 | $0 |
| Jul 9, 2022 | LOVEVILLE | 0 | $0 |
| Jul 9, 2022 | BUSHWOOD | 0 | $0 |
| Jun 10, 2021 | ST INIGOES | 0 | $0 |
Other hazards here
More from St. Mary's County
- Thunderstorm Wind 336
- Flood 85
- Hail 80
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Water rushed and flooded several buildings at the College of Southern Maryland. There were reports from the college that at one time there was two feet of water rushing into the basements of the buildings. Many roads around the college were flooded. There were several car accidents due to the flooded roads, as well as several cars that stalled and had to be recovered with tow vehicles. In addition, flooded occurred at the government center in Leonardtown, mainly due to water leaking through the roof tiles.
The water level rose rapidly above flood stage of 6 feet along the St Mary's River at Great Mills. The water level eventually crested at 7.03 feet at 9:30 PM EST before falling below flood stage at 2:15 AM EST. Flat Iron Road was flooded with water around Great Mills.
The water level rapidly rose above flood stage along the St. Clement Creek in Clements. The water level crested at 9.09 feet at 10:00 AM on August 4th. Water approached Route 234 and 242. Water also approached homes near the creek north of Clements.
Quick answers
Frequently asked
How many flash flood events are on record in St. Mary's County, Maryland?
72 flash flood events are recorded in St. Mary's County between 1996 and 2022, causing 0 direct deaths.
What is the strongest flash flood recorded in St. Mary's County?
The strongest flash flood on record in St. Mary's County measured 0.
Where does the flash flood data for St. Mary's 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 St. Mary’s County, Maryland.” Severe Weather History. severeweatherhistory.com/county/maryland/st-marys-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.