USA – Deadly Flash Floods in Maryland and Pennsylvania After 250mm of Rain

Over 10 inches (254mm) of rain fell in areas of Pennsylvania and Maryland, USA, on Friday 31 August, 2018, causing major flash floods.

At least one person has died and one other is still missing in Maryland after vehicles were dragged from a bridge by flood water near Creswell.

In Pennsylvania, Governor Tom Wolf said that parts of the state experienced significant flash flooding on 31 August that impacted roads, bridges, homes and critical infrastructure. Train services were also interrupted. York and Lancaster counties in Pennsylvania issued disaster declarations.

Mount Joy in Lancaster County recorded 10.57 inches (268.48mm) of rain in around 24 hours to late 31 August, and Kruetz Creek, York County recorded 6.2 inches (157.48mm) during the same period according to NWS State College. Parts of Lebanon County also saw heavy rain, with Schaefferstown, recording 8.88 inches (225.55mm) from 30 to 31 August.

Governor Wolf said. “Pennsylvania Emergency Management Agency’s (PEMA) will work with local municipalities to develop damage assessments and address unmet needs. We continue to urge Pennsylvanians to monitor driving conditions to stay safe this weekend.”

Wide areas of Pennsylvania suffered major flooding in mid August this year when 7 counties – Susquehanna, Bradford, Wyoming, Sullivan, Columbia, Schuylkill, and Lackawanna – declared disasters.

In Maryland, State Police said in a statement of 01 September, 2018, that they had recovered the body of a man whose car was washed off a bridge by flooding near Creswell during the evening of 31 August 2018. Police said they will continue to search for at least one more victim who was believed to be swept away by flood water.

Harford County Fire and EMS said by the evening of 31 August they had responded to 25 swift water calls and Swiftwater rescue teams from Howard, Anne Arundel, Balt City, Carroll, and Chester Counties were requested into Harford County to assist.

Flood damage in Bel Air, Harford County, MD, USA. Photo: Harford County

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Flood Summary

Last updated: September 5, 2018
Maryland and Pennsylvania, USA, August to September 2018
August 31 to September 2, 2018
Flash flood
Extreme rainfall


A - Lancaster PA
B - York PA
C - Creswell MD


Rainfall level
268.48 mm in 24 hours
Mount Joy, PA - August 30 to August 31, 2018
Figures from NWS State College
Rainfall level
157.48 mm in 24 hours
Kruetz Creek, PA - August 30 to August 31, 2018
Rainfall level
225.55 mm in 24 hours
Schaefferstown, PA - August 30 to August 31, 2018


2 people
Creswell MD - August 31 to September 2, 2018