314
Recorded events
2
Direct deaths
0
Direct injuries
$12.7M
Property damage
Flash Flood in Baltimore County, Maryland: 314 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #9 nationally and #1 statewide for this hazard.
Decade by decade
Flash Flood in Baltimore County, Maryland: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Baltimore County is the 2010s, when 186 of the county's 314 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 Baltimore County archive, flash flood makes up 23.8% of all recorded severe weather across 9 hazard types. Nationally the county sits at #9 for this hazard and #1 within Maryland, putting it in the 99.7 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for flash flood in Baltimore County with 111 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.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Jun 19, 1996 | S PORTION | 0 | 2 | 0 | $25K |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Aug 14, 2025 | DUNDALK | 0 | $0 |
| Aug 13, 2025 | DUNDALK | 0 | $0 |
| Jul 31, 2025 | RIDERWOOD | 0 | $0 |
| Jul 31, 2025 | MILFORD | 0 | $0 |
| Jul 31, 2025 | RUXTON | 0 | $0 |
| Jul 31, 2025 | FORK | 0 | $0 |
| Jul 31, 2025 | RUXTON | 0 | $0 |
| Jul 31, 2025 | FORK | 0 | $0 |
| Jul 31, 2025 | FORK | 0 | $0 |
| Jul 31, 2025 | WHITE MARSH | 0 | $0 |
Other hazards here
More from Baltimore County
- Thunderstorm Wind 638
- Flood 162
- Hail 146
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Numerous roads were closed countywide due to flash flooding. Water rescues occurred on Route 45/York Rd as well as on Seminary Road in Towson. A basement flooded in Timonium. Baltimore County Fire Department reports that Philadelphia Road between Raphel Road and Jones Road was closed until further notice due to washout in White Marsh. The Patapsco River overflowed its banks on the Baltimore County side of Frederick Road. Annapolis Road in Baltimore Highlands was flooded. The MARC's Brunswick and Camden routes closed, while other routes were disrupted. In some cases, the understructure of the track was washed away.
The stream gauge on Sawmill Creek exceeded its flood stage of 5 feet. Numerous roads were closed and flooding was reported in two businesses. This is the highest creek level ever recorded at this location and records date back to 1983. The record crest of 7.61 feet at 4:30 PM EDT.
The water level rapidly rose above flood stage of 11 feet along the Whitemarsh Run at White Marsh. At 11 feet, water covers the parking lots near the stream, particularly near the Town Center Court. The water fell below flood stage at 12:55 AM EST.
Quick answers
Frequently asked
How many flash flood events are on record in Baltimore County, Maryland?
314 flash flood events are recorded in Baltimore County between 1996 and 2025, causing 2 direct deaths.
What is the strongest flash flood recorded in Baltimore County?
The strongest flash flood on record in Baltimore County measured 0.
Where does the flash flood data for Baltimore 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 Baltimore County, Maryland.” Severe Weather History. severeweatherhistory.com/county/maryland/baltimore-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.