Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 1999
Severe Thunderstorm Warnings in Pennsylvania, September 1999
30 severe thunderstorm warnings in September 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in September 1999. Tap one for its archive.
- Severe Thunderstorm Warnings
- 30
- Busiest day
- September 30, 199911 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 |
|---|---|---|---|---|
| Sep 6, 2:37 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 53 min |
| Sep 6, 2:45 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 60 min |
| Sep 6, 3:27 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 48 min |
| Sep 6, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 64 min |
| Sep 6, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 58 min |
| Sep 9, 4:01 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 59 min |
| Sep 9, 4:38 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 52 min |
| Sep 9, 5:08 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 67 min |
| Sep 9, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 51 min |
| Sep 29, 3:18 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 57 min |
| Sep 29, 3:35 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 55 min |
| Sep 29, 4:06 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 54 min |
| Sep 29, 4:20 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 55 min |
| Sep 29, 4:29 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 61 min |
| Sep 29, 4:49 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 61 min |
| Sep 29, 4:51 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 54 min |
| Sep 29, 4:57 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 63 min |
| Sep 29, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 62 min |
| Sep 29, 6:02 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 58 min |
| Sep 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield | 54 min |
| Sep 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Cameron | 54 min |
| Sep 29, 10:27 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Potter | 78 min |
| Sep 29, 11:43 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 47 min |
| Sep 29, 11:46 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 44 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 51 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 66 min |
| Sep 30, 12:35 AM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin | 40 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 59 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland | 59 min |
| Sep 30, 1:02 AM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 43 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cambria County3
- Clinton County3
- Dauphin County2
- Venango County2
- Warren County2
- Juniata County2
- Snyder County2
- Bedford County1
- Lancaster County1
- York County1
- Perry County1
- Forest County1
- McKean County1
- Berks County1
- Washington County1
- Allegheny County1
- Beaver County1
- Butler County1
- Lawrence County1
- Crawford County1
- Erie County1
- Mercer County1
- Armstrong County1
- Blair County1
- Centre County1
- Clearfield County1
- Cameron County1
- Potter County1
- Cumberland County1
- Columbia County1
- Lycoming County1
- Sullivan County1
- Montour County1
- Northumberland County1
- Lebanon County1
- Schuylkill County1
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.