Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 1999
Severe Thunderstorm Warnings in Pennsylvania, May 1999
33 severe thunderstorm warnings in May 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 May 1999. Tap one for its archive.
- Severe Thunderstorm Warnings
- 33
- Busiest day
- May 24, 199919 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 |
|---|---|---|---|---|
| May 7, 6:37 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 38 min |
| May 7, 8:00 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 30 min |
| May 8, 3:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 46 min |
| May 8, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Tioga | 61 min |
| May 8, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Union | 61 min |
| May 8, 5:28 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 62 min |
| May 8, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder | 58 min |
| May 8, 5:32 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour | 58 min |
| May 8, 5:44 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 61 min |
| May 8, 6:07 PM EDT | Severe Thunderstorm Warning | CTP | Columbia | 53 min |
| May 12, 6:21 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 24 min |
| May 12, 6:44 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Juniata, Mifflin | 46 min |
| May 18, 3:48 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 57 min |
| May 18, 5:36 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 54 min |
| May 24, 10:08 AM EDT | Severe Thunderstorm Warning | PHI | Bucks | 32 min |
| May 24, 10:58 AM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 59 min |
| May 24, 11:15 AM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 58 min |
| May 24, 11:24 AM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 57 min |
| May 24, 12:04 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Clearfield | 56 min |
| May 24, 12:08 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 30 min |
| May 24, 12:43 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clinton | 62 min |
| May 24, 12:43 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 62 min |
| May 24, 2:03 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Tioga | 57 min |
| May 24, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Sullivan | 50 min |
| May 24, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Northumberland, Snyder, Union | 50 min |
| May 24, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Montour | 50 min |
| May 24, 2:51 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 64 min |
| May 24, 3:11 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 29 min |
| May 24, 3:18 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne, Wyoming | 62 min |
| May 24, 3:26 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 34 min |
| May 24, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 30 min |
| May 24, 3:47 PM EDT | Severe Thunderstorm Warning | BGM | Susquehanna | 63 min |
| May 24, 4:26 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 34 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Bucks County3
- Columbia County3
- Lycoming County2
- Tioga County2
- Union County2
- Bradford County2
- Northumberland County2
- Snyder County2
- Montour County2
- Sullivan County2
- Huntingdon County2
- Somerset County1
- Bedford County1
- Montgomery County1
- Juniata County1
- Mifflin County1
- Washington County1
- Greene County1
- Allegheny County1
- Westmoreland County1
- Armstrong County1
- Cambria County1
- Clearfield County1
- Indiana County1
- Cameron County1
- Clinton County1
- Centre County1
- Chester County1
- Luzerne County1
- Wyoming County1
- Delaware County1
- Philadelphia County1
- Susquehanna 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.