Debris Flow in Pennsylvania
Every debris flow event the National Weather Service has filed in Pennsylvania, year by year, with the most significant episodes. A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.
The most significant on the map
The most significant debris flow 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
- 8
- Deaths
- 0
- Injuries
- 0
- Damage
- $80,000
Every year
The most significant
Ranked by deaths, injuries, damage and size together.
- Flash Flood and Debris Flows in Pennsylvania, July 3 to 4, 2011Isolated severe thunderstorms developed in the afternoon as a cold front began to sag across the region on the 3rd. The weak front then stalled along the Mason-Dixon line. As an upper level short wave progressed across the front on July 4th, additional thunderstorms developed.
- Debris Flow in Pennsylvania, January 14, 2005Snowmelt followed by 1 to 2 inches of rain caused a landslide on US Route 11 just north of Shickshinny. Mud spilled across 2 1//2 lanes of the highway. It took several hours to remove the debris.
- Flash Flood and Debris Flow in Pennsylvania, August 28, 2013A shortwave crossing the region helped support for the development of showers and thunderstorms a few of which became severe. However, the bigger threat was heavy rain, as there was plenty of low level moisture to support one to two inch an hour rain rates.
- Flash Flooding and Debris Flow in Pennsylvania, June 16, 2017Yet another day of showers and thunderstorms with heavy rain passed over Allegheny county, Pennsylvania. After 3 prior days of rain, flash flood guidance was less than an inch over the region.
- Debris Flow in Pennsylvania, June 15, 2016A mudslide occurred in Greene county due to wet soil the evening of the 15th.
- Flash Flooding and Debris Flow in Pennsylvania, July 5 to 6, 2017Slow-moving thunderstorms with heavy rain developed along a stalled boundary across the upper Ohio Valley on the 5th through the 6th. A very warm and moist conditions supported heavy rainfall rates that lead to flooding in several counties across the region.
- Debris Flow and Flood in Pennsylvania, February 12 to 13, 2020Low pressure rode up the Ohio Valley during the nighttime and early morning hours of February 12th to the 13th.
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.