Flash Flood Warnings in Pennsylvania
5,205 flash flood warnings since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Flash Flood Warnings
- 5,205
- Busiest year
- 1996535 flash flood warnings
- Average year
- 127over 41 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Allegheny County387
- Westmoreland County330
- Montgomery County318
- Bucks County307
- Chester County295
- Lancaster County235
- Philadelphia County234
- York County228
- Berks County226
- Washington County222
- Delaware County218
- Fayette County200
- Bradford County197
- Butler County190
- Armstrong County164
- Lehigh County156
- Luzerne County154
- Northampton County153
- Beaver County151
- Somerset County149
- Bedford County147
- Susquehanna County146
- Dauphin County144
- Indiana County144
- Crawford County142
- Venango County139
- Cumberland County138
- Mercer County134
- Lawrence County127
- Wayne County127
- Monroe County127
- Lycoming County124
- Huntingdon County123
- Clarion County122
- Erie County121
- Greene County121
- Adams County120
- Jefferson County119
- Wyoming County118
- Cambria County117
27 more counties
- Lackawanna County117
- Clearfield County115
- Lebanon County114
- Franklin County110
- Schuylkill County105
- Blair County96
- Perry County90
- Pike County89
- Carbon County86
- Union County85
- Northumberland County85
- McKean County83
- Centre County83
- Columbia County82
- Forest County77
- Tioga County77
- Warren County75
- Sullivan County69
- Fulton County65
- Snyder County64
- Juniata County60
- Elk County57
- Montour County57
- Potter County56
- Clinton County52
- Mifflin County45
- Cameron County29
The latest flash flood warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 10:37 AM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
| Sep 20, 2:48 AM EDT | Flash Flood Warning | PBZ | Washington | 2 hr |
| Sep 17, 9:16 PM EDT | Flash Flood Warning | CTP | Somerset | 3 hr |
| Sep 13, 5:26 PM EDT | Flash Flood Warning | PBZ | Mercer | 3 hr |
| Sep 13, 8:06 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 13, 2:28 AM EDT | Flash Flood Warning | PBZ | Clarion | 3 hr |
| Sep 12, 10:42 PM EDT | Flash Flood Warning | CTP | Elk | 4 hr |
| Sep 12, 9:19 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler | 116 min |
| Sep 12, 6:14 PM EDT | Flash Flood Warning | PBZ | Fayette, Greene, Washington | 2 hr |
| Sep 12, 5:10 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 3 hr |
| Sep 12, 4:55 PM EDT | Flash Flood Warning | PBZ | Armstrong, Indiana | 3 hr |
| Sep 12, 3:55 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 3 hr |
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.