Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 1999
Severe Thunderstorm Warnings in Pennsylvania, August 1999
49 severe thunderstorm warnings in August 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 August 1999. Tap one for its archive.
- Severe Thunderstorm Warnings
- 49
- Busiest day
- August 14, 199922 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 |
|---|---|---|---|---|
| Jul 31, 8:05 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence | 60 min |
| Jul 31, 8:07 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 53 min |
| Jul 31, 8:18 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Tioga | 42 min |
| Jul 31, 8:40 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 65 min |
| Jul 31, 8:49 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Potter | 41 min |
| Jul 31, 9:00 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 60 min |
| Jul 31, 9:28 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 62 min |
| Jul 31, 9:48 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 57 min |
| Aug 1, 1:22 AM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 38 min |
| Aug 4, 10:47 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 63 min |
| Aug 13, 4:00 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 60 min |
| Aug 13, 4:22 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 53 min |
| Aug 13, 4:26 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 64 min |
| Aug 13, 4:34 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 86 min |
| Aug 13, 4:55 PM EDT | Severe Thunderstorm Warning | CTP | Blair | 65 min |
| Aug 13, 5:18 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 57 min |
| Aug 13, 5:39 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Union | 66 min |
| Aug 13, 6:04 PM EDT | Severe Thunderstorm Warning | PBZ | Greene, Washington | 56 min |
| Aug 13, 6:28 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 62 min |
| Aug 13, 8:08 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Juniata, Northumberland, Perry, Snyder | 67 min |
| Aug 13, 8:08 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin | 67 min |
| Aug 13, 8:08 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 67 min |
| Aug 13, 8:43 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 32 min |
| Aug 13, 8:54 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 46 min |
| Aug 13, 9:42 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 33 min |
| Aug 13, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 61 min |
| Aug 13, 10:14 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 61 min |
| Aug 13, 10:27 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 63 min |
| Aug 13, 10:29 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 61 min |
| Aug 13, 11:30 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 60 min |
| Aug 14, 1:49 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 56 min |
| Aug 14, 2:41 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 64 min |
| Aug 14, 2:45 PM EDT | Severe Thunderstorm Warning | CTP | York | 30 min |
| Aug 14, 3:33 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 57 min |
| Aug 14, 3:50 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 55 min |
| Aug 14, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Perry | 64 min |
| Aug 14, 4:54 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 46 min |
| Aug 14, 5:09 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 66 min |
| Aug 14, 5:19 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 51 min |
| Aug 14, 6:25 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour | 65 min |
| Aug 14, 7:11 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 64 min |
| Aug 20, 2:09 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 66 min |
| Aug 20, 3:33 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 57 min |
| Aug 24, 4:49 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 56 min |
| Aug 26, 4:44 PM EDT | Severe Thunderstorm Warning | CTP | York | 61 min |
| Aug 26, 5:41 PM EDT | Severe Thunderstorm Warning | CTP | York | 49 min |
| Aug 26, 6:23 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin | 67 min |
| Aug 26, 6:24 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 66 min |
| Aug 27, 4:07 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 68 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lancaster County6
- York County4
- Clearfield County3
- Clinton County3
- Elk County2
- Lycoming County2
- Tioga County2
- Allegheny County2
- Westmoreland County2
- Indiana County2
- Franklin County2
- Huntingdon County2
- Juniata County2
- Perry County2
- Schuylkill County2
- Luzerne County2
- Carbon County2
- Monroe County2
- Butler County1
- Lawrence County1
- Potter County1
- Beaver County1
- Fulton County1
- Erie County1
- Cambria County1
- Centre County1
- Blair County1
- Union County1
- Greene County1
- Washington County1
- Fayette County1
- Northumberland County1
- Snyder County1
- Cumberland County1
- Dauphin County1
- Northampton County1
- Lebanon County1
- Berks County1
- Delaware County1
- Philadelphia 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.