Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 2009
Severe Thunderstorm Warnings in Pennsylvania, August 2009
102 severe thunderstorm warnings in August 2009. 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in August 2009. Tap one for its archive.
- Severe Thunderstorm Warnings
- 102
- Busiest day
- August 21, 200920 severe thunderstorm warnings
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|---|
| Aug 2, 7:30 AM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 60 min |
| Aug 2, 8:29 AM EDT | Severe Thunderstorm Warning | CTP | Adams, Dauphin, Lancaster, Lebanon, York | 61 min |
| Aug 2, 10:08 AM EDT | Severe Thunderstorm Warning | PHI | Chester | 67 min |
| Aug 2, 10:24 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 66 min |
| Aug 2, 10:53 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 67 min |
| Aug 2, 11:14 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Montgomery, Northampton | 61 min |
| Aug 2, 11:25 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 65 min |
| Aug 2, 11:48 AM EDT | Severe Thunderstorm Warning | PHI | Bucks | 57 min |
| Aug 4, 5:31 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 44 min |
| Aug 9, 2:20 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter, Tioga | 70 min |
| Aug 9, 2:26 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 79 min |
| Aug 9, 3:01 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming, Potter, Tioga | 59 min |
| Aug 9, 3:28 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 46 min |
| Aug 9, 3:28 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clinton, Elk, McKean, Potter | 62 min |
| Aug 9, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Columbia, Lycoming, Montour, Northumberland and 4 more | 43 min |
| Aug 9, 4:10 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Luzerne, Wyoming | 53 min |
| Aug 9, 4:25 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Juniata, Lebanon, Montour, Northumberland and 4 more | 65 min |
| Aug 9, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 90 min |
| Aug 9, 4:41 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 64 min |
| Aug 9, 5:11 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Perry, York | 49 min |
| Aug 9, 5:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 76 min |
| Aug 9, 5:19 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 56 min |
| Aug 9, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 82 min |
| Aug 9, 5:58 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 32 min |
| Aug 9, 5:59 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 46 min |
| Aug 9, 6:10 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 80 min |
| Aug 10, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter, Tioga, Warren | 81 min |
| Aug 10, 2:38 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 67 min |
| Aug 10, 3:37 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 53 min |
| Aug 10, 4:11 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 64 min |
| Aug 10, 4:24 PM EDT | Severe Thunderstorm Warning | CLE | Crawford | 66 min |
| Aug 10, 4:27 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 63 min |
| Aug 10, 4:47 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 58 min |
| Aug 10, 4:53 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer | 37 min |
| Aug 10, 5:17 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Forest, Venango | 43 min |
| Aug 10, 5:23 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 52 min |
| Aug 10, 5:31 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna | 44 min |
| Aug 10, 6:01 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Huntingdon | 44 min |
| Aug 10, 6:12 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna, Wayne | 63 min |
| Aug 10, 6:24 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 66 min |
| Aug 10, 6:39 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 66 min |
| Aug 10, 6:54 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Pike, Wayne | 66 min |
| Aug 11, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 43 min |
| Aug 11, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 34 min |
| Aug 11, 4:21 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 54 min |
| Aug 18, 12:51 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 54 min |
| Aug 18, 3:44 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 61 min |
| Aug 18, 3:52 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 53 min |
| Aug 18, 4:01 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Snyder | 59 min |
| Aug 18, 4:18 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, York | 57 min |
| Aug 18, 4:23 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry | 52 min |
| Aug 18, 4:44 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming | 46 min |
| Aug 18, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 56 min |
| Aug 18, 4:50 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Northumberland, Perry, Snyder, Union | 55 min |
| Aug 18, 4:57 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lebanon, York | 78 min |
| Aug 18, 5:05 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 55 min |
| Aug 18, 5:25 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Montour, Sullivan | 80 min |
| Aug 18, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Lebanon, Northumberland, Schuylkill | 70 min |
| Aug 18, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 60 min |
| Aug 18, 5:54 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland | 51 min |
| Aug 18, 6:02 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 88 min |
| Aug 18, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 72 min |
| Aug 18, 7:22 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 53 min |
| Aug 18, 7:37 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 68 min |
| Aug 18, 8:35 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 70 min |
| Aug 19, 2:19 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Susquehanna | 41 min |
| Aug 19, 3:19 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 56 min |
| Aug 19, 3:36 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Wyoming | 54 min |
| Aug 19, 4:34 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Schuylkill | 56 min |
| Aug 19, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 55 min |
| Aug 19, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 37 min |
| Aug 19, 5:33 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Perry, York | 57 min |
| Aug 19, 6:31 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lancaster, Lebanon, York | 59 min |
| Aug 20, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Northumberland, Perry, Snyder | 50 min |
| Aug 20, 3:15 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, Northumberland, Perry, Schuylkill | 60 min |
| Aug 20, 3:52 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 53 min |
| Aug 20, 4:38 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 52 min |
| Aug 20, 6:28 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Mercer, Venango | 62 min |
| Aug 20, 7:03 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 72 min |
| Aug 20, 7:37 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 53 min |
| Aug 20, 7:44 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence | 61 min |
| Aug 20, 7:50 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 55 min |
| Aug 20, 8:06 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Greene, Washington | 54 min |
| Aug 20, 8:18 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 57 min |
| Aug 20, 8:37 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 53 min |
| Aug 21, 11:32 AM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Dauphin, Perry, York | 58 min |
| Aug 21, 12:06 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Dauphin, Lancaster, York | 54 min |
| Aug 21, 12:15 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lebanon, Schuylkill | 75 min |
| Aug 21, 12:18 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 42 min |
| Aug 21, 12:20 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 55 min |
| Aug 21, 12:41 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon, York | 49 min |
| Aug 21, 12:48 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 57 min |
| Aug 21, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 35 min |
| Aug 21, 1:16 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 59 min |
| Aug 21, 1:27 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 63 min |
| Aug 21, 1:29 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 76 min |
| Aug 21, 1:40 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 35 min |
| Aug 21, 1:48 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 57 min |
| Aug 21, 1:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 68 min |
| Aug 21, 1:55 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 65 min |
| Aug 21, 2:01 PM EDT | Severe Thunderstorm Warning | BGM | Pike | 44 min |
| Aug 21, 2:23 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 21 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- York County16
- Dauphin County13
- Lancaster County11
- Chester County9
- McKean County9
- Lebanon County8
- Montgomery County8
- Northumberland County8
- Perry County8
- Adams County7
- Columbia County7
- Monroe County7
- Schuylkill County6
- Berks County6
- Cumberland County6
- Delaware County5
- Philadelphia County5
- Bucks County5
- Potter County5
- Clinton County5
- Lycoming County5
- Montour County5
- Snyder County5
- Juniata County5
- Carbon County5
- Pike County5
- Northampton County4
- Erie County4
- Tioga County4
- Warren County4
- Susquehanna County4
- Crawford County4
- Mercer County4
- Venango County4
- Lawrence County4
- Wayne County4
- Lehigh County3
- Sullivan County3
- Union County3
- Bradford County3
19 more counties
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
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.