Alert archive / Pennsylvania / Flash Flood Warnings
Flash Flood Warnings in Pennsylvania, 1999
133 flash flood warnings in 1999. 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 in 1999. Tap one for its archive.
- Flash Flood Warnings
- 133
- Busiest month
- September44 flash flood warnings
- Busiest day
- September 16, 199921 flash flood warnings
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 3, 3:41 PM EST | Flash Flood Warning | PHI | Chester | 2 hr |
| Jan 9, 1:40 PM EST | Flash Flood Warning | PHI | Berks, Lehigh | 4 hr |
| Jan 18, 10:33 AM EST | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Jan 18, 1:25 PM EST | Flash Flood Warning | CTP | Lancaster | 4 hr |
| Jan 18, 3:03 PM EST | Flash Flood Warning | CTP | Columbia, Lycoming, Montour, Northumberland, Sullivan | 4 hr |
| Jan 18, 3:03 PM EST | Flash Flood Warning | CTP | Lebanon, Schuylkill | 4 hr |
| Jan 18, 3:15 PM EST | Flash Flood Warning | PHI | Berks | 3 hr |
| Jan 18, 4:05 PM EST | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Jan 18, 5:15 PM EST | Flash Flood Warning | BGM | Luzerne | 3 hr |
| Jan 18, 6:20 PM EST | Flash Flood Warning | PHI | Berks, Lehigh, Montgomery, Northampton | 4 hr |
| Jan 18, 7:10 PM EST | Flash Flood Warning | CTP | Lancaster, Lebanon | 5 hr |
| Jan 18, 10:25 PM EST | Flash Flood Warning | CTP | Lancaster, Lebanon | 6 hr |
| Jan 18, 11:10 PM EST | Flash Flood Warning | CTP | York | 5 hr |
| Jan 19, 1:38 PM EST | Flash Flood Warning | CTP | Lycoming | 5 hr |
| Jan 23, 11:50 AM EST | Flash Flood Warning | PBZ | Clarion | 4 hr |
| Jan 23, 12:31 PM EST | Flash Flood Warning | PBZ | Butler | 9 hr |
| Jan 23, 2:30 PM EST | Flash Flood Warning | PBZ | Lawrence | 8 hr |
| Jan 23, 5:25 PM EST | Flash Flood Warning | CTP | Bedford, Blair, Cambria, Clearfield | 6 hr |
| Jan 23, 5:25 PM EST | Flash Flood Warning | CTP | Somerset | 6 hr |
| Jan 23, 7:32 PM EST | Flash Flood Warning | CTP | Huntingdon | 6 hr |
| Jan 23, 10:40 PM EST | Flash Flood Warning | CTP | Centre | 6 hr |
| Jan 23, 11:01 PM EST | Flash Flood Warning | CTP | Juniata, Mifflin | 6 hr |
| Jan 23, 11:54 PM EST | Flash Flood Warning | PBZ | Lawrence | 8 hr |
| Jan 24, 1:58 AM EST | Flash Flood Warning | CTP | Huntingdon | 3 hr |
| Jan 24, 3:58 AM EST | Flash Flood Warning | CTP | Northumberland, Union | 4 hr |
| Jan 24, 4:39 AM EST | Flash Flood Warning | CTP | Centre, Huntingdon, Juniata, Mifflin | 3 hr |
| Jan 24, 7:30 AM EST | Flash Flood Warning | PBZ | Lawrence | 5 hr |
| Jan 24, 7:51 AM EST | Flash Flood Warning | CTP | Centre | 4 hr |
| Jan 24, 7:51 AM EST | Flash Flood Warning | CTP | Juniata | 4 hr |
| Jan 24, 8:00 AM EST | Flash Flood Warning | CTP | Columbia, Northumberland | 4 hr |
| Jan 24, 8:00 AM EST | Flash Flood Warning | CTP | Union | 4 hr |
| Jan 24, 9:23 AM EST | Flash Flood Warning | CTP | Huntingdon | 3 hr |
| Jan 24, 11:59 AM EST | Flash Flood Warning | CTP | Huntingdon | 4 hr |
| Jan 24, 11:59 AM EST | Flash Flood Warning | CTP | Columbia | 4 hr |
| Jan 24, 11:59 AM EST | Flash Flood Warning | CTP | Union | 4 hr |
| Jan 24, 12:55 PM EST | Flash Flood Warning | PBZ | Mercer | 4 hr |
| Jan 24, 1:16 PM EST | Flash Flood Warning | CTP | Lycoming | 3 hr |
| Jan 24, 4:45 PM EST | Flash Flood Warning | PBZ | Mercer | 6 hr |
| Jan 24, 10:10 PM EST | Flash Flood Warning | PBZ | Mercer | 7 hr |
| Jan 25, 4:50 AM EST | Flash Flood Warning | PBZ | Mercer | 5 hr |
| Mar 3, 9:48 PM EST | Flash Flood Warning | CTP | Clinton, Lycoming | 3 hr |
| Mar 21, 7:57 PM EST | Flash Flood Warning | PHI | Chester | 6 hr |
| Mar 21, 8:47 PM EST | Flash Flood Warning | CTP | Lancaster, York | 5 hr |
| Mar 21, 9:10 PM EST | Flash Flood Warning | PHI | Berks | 5 hr |
| Mar 21, 9:40 PM EST | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe | 4 hr |
| Mar 21, 10:34 PM EST | Flash Flood Warning | PHI | Montgomery | 3 hr |
| Mar 21, 11:15 PM EST | Flash Flood Warning | PHI | Bucks | 3 hr |
| Mar 21, 11:50 PM EST | Flash Flood Warning | PHI | Philadelphia | 3 hr |
| Mar 22, 12:19 AM EST | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| Mar 22, 12:19 AM EST | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 3 hr |
| Mar 22, 12:19 AM EST | Flash Flood Warning | PHI | Berks, Chester | 3 hr |
| Apr 9, 2:52 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 3 hr |
| Apr 9, 2:58 PM EDT | Flash Flood Warning | PBZ | Fayette, Greene | 3 hr |
| Apr 9, 4:06 PM EDT | Flash Flood Warning | PBZ | Beaver | 2 hr |
| Apr 9, 4:19 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 3 hr |
| Apr 9, 4:23 PM EDT | Flash Flood Warning | PBZ | Butler | 3 hr |
| Apr 9, 5:51 PM EDT | Flash Flood Warning | PBZ | Washington, Westmoreland | 4 hr |
| Apr 9, 6:59 PM EDT | Flash Flood Warning | PBZ | Fayette | 3 hr |
| Apr 9, 9:46 PM EDT | Flash Flood Warning | PBZ | Fayette, Washington, Westmoreland | 6 hr |
| Apr 22, 12:59 AM EDT | Flash Flood Warning | PBZ | Allegheny | 91 min |
| Apr 22, 3:06 AM EDT | Flash Flood Warning | CTP | Cambria | 5 hr |
| May 18, 6:56 PM EDT | Flash Flood Warning | PBZ | Allegheny | 3 hr |
| May 18, 9:55 PM EDT | Flash Flood Warning | PBZ | Allegheny | 4 hr |
| May 24, 12:25 PM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 3 hr |
| Jul 17, 4:20 PM EDT | Flash Flood Warning | CTP | Somerset | 3 hr |
| Jul 28, 10:40 AM EDT | Flash Flood Warning | PBZ | Mercer | 2 hr |
| Jul 28, 10:46 AM EDT | Flash Flood Warning | PBZ | Lawrence | 3 hr |
| Jul 28, 12:28 PM EDT | Flash Flood Warning | PBZ | Allegheny | 3 hr |
| Jul 28, 12:34 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 2 hr |
| Jul 28, 1:03 PM EDT | Flash Flood Warning | PBZ | Lawrence | 4 hr |
| Jul 29, 1:16 AM EDT | Flash Flood Warning | PBZ | Lawrence | 3 hr |
| Jul 29, 2:00 AM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver | 3 hr |
| Aug 14, 2:14 AM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Aug 20, 10:18 AM EDT | Flash Flood Warning | CTP | Northumberland, Snyder, Union | 4 hr |
| Aug 20, 10:18 AM EDT | Flash Flood Warning | CTP | Montour | 4 hr |
| Aug 20, 11:25 AM EDT | Flash Flood Warning | CTP | Juniata | 3 hr |
| Aug 20, 2:03 PM EDT | Flash Flood Warning | CTP | McKean | 4 hr |
| Aug 20, 2:05 PM EDT | Flash Flood Warning | CTP | Juniata, Northumberland, Snyder | 3 hr |
| Aug 20, 2:05 PM EDT | Flash Flood Warning | CTP | Montour | 3 hr |
| Aug 20, 2:05 PM EDT | Flash Flood Warning | CTP | Union | 3 hr |
| Aug 20, 2:09 PM EDT | Flash Flood Warning | CTP | McKean | 66 min |
| Aug 20, 5:15 PM EDT | Flash Flood Warning | CTP | Juniata, Snyder | 5 hr |
| Aug 20, 5:15 PM EDT | Flash Flood Warning | CTP | Union | 5 hr |
| Aug 20, 5:33 PM EDT | Flash Flood Warning | PBZ | Forest | 4 hr |
| Aug 20, 5:50 PM EDT | Flash Flood Warning | CTP | McKean | 4 hr |
| Aug 26, 5:49 PM EDT | Flash Flood Warning | CTP | York | 3 hr |
| Aug 26, 10:46 PM EDT | Flash Flood Warning | CTP | Juniata, Perry | 3 hr |
| Aug 26, 11:00 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Aug 27, 5:09 PM EDT | Flash Flood Warning | CTP | Bedford | 3 hr |
| Sep 5, 11:34 PM EDT | Flash Flood Warning | PHI | Chester | 14 hr |
| Sep 6, 3:01 PM EDT | Flash Flood Warning | CTP | Franklin, Fulton | 3 hr |
| Sep 6, 3:01 PM EDT | Flash Flood Warning | CTP | Bedford, Cambria, Somerset | 3 hr |
| Sep 6, 4:17 PM EDT | Flash Flood Warning | CTP | Lancaster, York | 3 hr |
| Sep 6, 9:07 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, Perry, York | 3 hr |
| Sep 6, 11:37 PM EDT | Flash Flood Warning | CTP | Lycoming, Snyder, Union | 3 hr |
| Sep 6, 11:47 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, York | 3 hr |
| Sep 6, 11:47 PM EDT | Flash Flood Warning | CTP | Perry | 3 hr |
| Sep 7, 2:06 AM EDT | Flash Flood Warning | CTP | Northumberland | 3 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Perry, Snyder, Union | 4 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Dauphin, York | 4 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Lycoming | 4 hr |
| Sep 7, 3:45 AM EDT | Flash Flood Warning | CTP | Tioga | 2 hr |
| Sep 7, 4:10 AM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Sep 9, 5:54 PM EDT | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Sep 9, 6:10 PM EDT | Flash Flood Warning | CTP | York | 3 hr |
| Sep 9, 7:17 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 3 hr |
| Sep 9, 7:17 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Sep 9, 8:58 PM EDT | Flash Flood Warning | CTP | Lancaster, York | 3 hr |
| Sep 9, 10:45 PM EDT | Flash Flood Warning | CTP | Union | 3 hr |
| Sep 16, 8:37 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Philadelphia | 4 hr |
| Sep 16, 9:00 AM EDT | Flash Flood Warning | CTP | Dauphin, Lebanon, Schuylkill | 6 hr |
| Sep 16, 9:00 AM EDT | Flash Flood Warning | CTP | Lancaster, York | 6 hr |
| Sep 16, 9:00 AM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Perry | 6 hr |
| Sep 16, 9:25 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 6 hr |
| Sep 16, 11:25 AM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 6 hr |
| Sep 16, 11:25 AM EDT | Flash Flood Warning | PHI | Chester | 6 hr |
| Sep 16, 12:11 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 5 hr |
| Sep 16, 12:11 PM EDT | Flash Flood Warning | PHI | Northampton | 5 hr |
| Sep 16, 2:15 PM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Dauphin, Lancaster, York | 7 hr |
| Sep 16, 2:15 PM EDT | Flash Flood Warning | CTP | Perry | 7 hr |
| Sep 16, 2:15 PM EDT | Flash Flood Warning | CTP | Lebanon, Schuylkill | 7 hr |
| Sep 16, 2:41 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 6 hr |
| Sep 16, 3:21 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 6 hr |
| Sep 16, 4:21 PM EDT | Flash Flood Warning | PHI | Northampton | 5 hr |
| Sep 16, 4:21 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 5 hr |
| Sep 16, 4:35 PM EDT | Flash Flood Warning | CTP | Columbia, Lycoming, Montour, Northumberland, Union | 3 hr |
| Sep 16, 4:35 PM EDT | Flash Flood Warning | CTP | Snyder | 3 hr |
| Sep 16, 5:15 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne | 5 hr |
| Sep 16, 5:15 PM EDT | Flash Flood Warning | BGM | Pike, Wayne | 5 hr |
| Sep 16, 7:30 PM EDT | Flash Flood Warning | CTP | Snyder, Union | 90 min |
| Sep 16, 9:59 PM EDT | Flash Flood Warning | BGM | Pike | 6 hr |
| Sep 16, 9:59 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne, Wayne | 6 hr |
| Sep 30, 1:25 AM EDT | Flash Flood Warning | CTP | Snyder, Union | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Union County12
- Lancaster County11
- York County11
- Berks County9
- Chester County8
- Snyder County8
- Lycoming County7
- Northumberland County7
- Juniata County7
- Lehigh County6
- Lawrence County6
- Bucks County6
- Philadelphia County6
- Allegheny County6
- Perry County6
- Lebanon County5
- Montgomery County5
- Northampton County5
- Huntingdon County5
- Mercer County5
- Dauphin County5
- Columbia County4
- Montour County4
- Monroe County4
- Delaware County4
- Westmoreland County4
- Cumberland County4
- Schuylkill County3
- Luzerne County3
- Bedford County3
- Cambria County3
- Somerset County3
- Centre County3
- Carbon County3
- Washington County3
- Fayette County3
- McKean County3
- Butler County2
- Mifflin County2
- Beaver County2
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive19982000
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. Warning verification from the Mesonet's Cow. Rebuilt daily.