Flood in Pennsylvania
Every flood event the National Weather Service has filed in Pennsylvania, year by year, with the most significant episodes. Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
The most significant on the map
The most significant flood episodes in Pennsylvania.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The record
- Events
- 2,203
- Deaths
- 33
- Injuries
- 107
- Damage
- $841 million
Every year
The most significant
Ranked by deaths, injuries, damage and size together.
- Flooding and Coastal Flood in Pennsylvania, October 29 to 30, 2012Post Tropical Storm Sandy caused an initial estimate of $20 million dollars in damage in Pennsylvania and directly or indirectly caused 15 deaths across the state. Most of the damage in the eastern part of the state was wind related as wind gusts reached as high as 81 mph.
- Flash Flooding and Flooding in Pennsylvania, September 7 to 11, 2011Heavy rainfall from the remnants of Tropical Storm Lee produced widespread flooding, flash flooding and river flooding mainly near and to the east of the Susquehanna Valley from September 4-10.
- Flood in Pennsylvania, September 17 to 19, 2004At 124 PM EDT on 17th, road flooding was reported 2 miles west of Pittsburgh. At 2 PM, Wexford flooded. At 218 PM, roads flooded in Oakdale. By 315 PM, Springdale Boro flooded; and Wexford had 4.5" of rain. .
- Flash Flooding and Flooding in Pennsylvania, August 19, 2011A slow moving cold front and a moist unstable airmass combined to produce scattered severe thunderstorms and flash flooding across eastern Ohio and Western Pennsylvania.
- Flooding in Pennsylvania, January 19 to 21, 1996The combination of snowmelt from the previous week's two storms, unseasonably warm temperatures and an additional one to two inches of rain caused the flash flooding of almost every small stream and significant roadway flooding the afternoon and early evening hours on the 19th.
- Tropical Storm and Storm Surge in Pennsylvania, August 27 to 30, 2011Irene produced heavy flooding rain, tropical storm force wind gusts with hundreds of thousands of outages, moderate tidal flooding along the Delaware River and one flooding related death in Eastern Pennsylvania over the weekend of August 27th and 28th.
- Tornadoes and Tropical Storm in Pennsylvania, August 4, 2020Tropical Storm Isaias brought high winds, heavy rain, several tornadoes, and coastal flooding to the mid-Atlantic region, becoming the most impactful tropical cyclone to impact most of the region since Sandy in 2012.
- Flooding in Pennsylvania, September 17 to 19, 2004The remnants of Hurricane Ivan moved north along the Appalachians during Friday, September 17th, and interacted with an approaching cold front, leading to a large swath of excessive rainfall across central Pennsylvania as the system weakened to a tropical depression.
- Flash Flood and Flood in Pennsylvania, June 27 to 30, 2006Several days of heavy rain throughout the Delaware and Lehigh River Basins culminated with major flooding along the Delaware River from the 28th through the 30th.
- Flash Flooding and Flooding in Pennsylvania, September 7 to 12, 2011The remnants of Tropical Storm Lee moved northward from the southern Appalachians on the 6th to the middle Atlantic states on the 7th before stalling on the 8th.
- Flash Flooding and Flooding in Pennsylvania, July 22 to 27, 2018I persistent upper level flow of moist southerly air brought waves of flooding and flash flooding to the region. Significant flooding was reported across eastern portions of the area.
- Tornadoes and Flash Flooding in Pennsylvania, June 27 to 28, 2013A MCV and broader mid-level trough crossed the central Appalachians and triggered strong to severe thunderstorms from the central ridges into the Susquehanna River Valley during the afternoon and evening.
- Flooding in Pennsylvania, October 1, 2010A series of low pressure systems that moved north along a slowly moving cold front brought heavy rain into Eastern Pennsylvania on September 30th and October 1st. Event precipitation totals average 5 to 10 inches with the highest amounts in the Philadelphia western suburbs.
- Flash Flood and Flooding in Pennsylvania, August 28, 2011Hurricane Irene moved north-northeast along the Mid-Atlantic Coast from North Carolina to Long Island New York.
- Flooding and Heavy Rain in Pennsylvania, November 8 to 9, 2006A slow moving low pressure system that moved from the Gulf of Mexico caused heavy rain to fall during about a twelve hour period on the 8th in Eastern Pennsylvania. Storm totals averaged between 2 and 3 inches. The heavy rain caused urban and poor drainage flooding.
- Flood and Hail in Pennsylvania, June 10, 1999Two children of undetermined age were struck by lightning while playing outside. Both received only minor injuries and were treated and released from hospital.
- Flash Flooding and Flood in Pennsylvania, July 1, 2025A cold front stationed across west-central Pennsylvania began traversing eastward across the area during the afternoon hours of July 1, 2025.
- Flooding and Heavy Snow in Pennsylvania, October 29 to 31, 2012Hurricane Sandy began as a tropical wave over the Caribbean Sea around 19 October 2012 and became a powerful storm by 23 October 2012 before making its long track over the western Atlantic, just off the East Coast of the United States and then into New Jersey and Pennsylvania.
- Flash Flooding and Flooding in Pennsylvania, September 5 to 10, 2011The remnants of Tropical Storm Lee that interacted with a stalled frontal boundary produced several days with periods of heavy rain across Eastern Pennsylvania from the 5th into the 8th.
- Flooding in Pennsylvania, March 10 to 14, 2011Heavy rainfall between 1 and 2 inches over northwest Pennsylvania and 2 to 4 inches across central and eastern Pennsylvania combined with snowmelt in the northern mountains to produce significant flooding. The worst flooding occurred over the eastern half of the Commonwealth.
- Flood in Pennsylvania, April 13 to 14, 2004Roads and basements flooded in Uniontown 430 PM EDT 13th. By 515 PM EDT, there was widespread flooding of streams. By 630 PM EDT, Jacobs Creek was reported south of Smithton.
- Tornado and Flash Flood in Pennsylvania, August 12, 2023A mid-level shortwave trough moved across the northern Great Lakes with a belt of stronger flow moving through the southern Great Lakes. Scattered thunderstorms|developed through midday into the afternoon. Forecast soundings showed some low-level hodograph curvature.
- Flood in Pennsylvania, April 2 to 5, 2005For the second time within seven months a greater than 50-year storm affected the Delaware River Basin and its tributaries. In all, about 5,715 homes were evacuated along the Delaware and Susquehanna Rivers in Pennsylvania.
- Flood in Pennsylvania, April 2 to 5, 2005For the second time within seven months a greater than 50-year storm affected the Delaware River Basin and its tributaries. In all, about 5,715 homes were evacuated along the Delaware and Susquehanna Rivers in Pennsylvania.
- Flood in Pennsylvania, April 3 to 5, 2005For the second time within seven months a greater than 50-year storm affected the Delaware River Basin and its tributaries. In all, about 5,715 homes were evacuated along the Delaware and Susquehanna Rivers in Pennsylvania.
More
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.