Alert archive / Pennsylvania / Severe Thunderstorm Watches / 2018
Severe Thunderstorm Watches in Pennsylvania, May 2018
9 severe thunderstorm watches in May 2018. 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 watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in May 2018. Tap one for its archive.
- Severe Thunderstorm Watches
- 9
- Busiest day
- May 4, 20183 severe thunderstorm watches
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 4, 1:22 PM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 5 hr |
| May 4, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Bradford, Butler, Cambria and 23 more | 6 hr |
| May 4, 6:20 PM EDT | Severe Thunderstorm Watch | SPC | Columbia, Lackawanna, Luzerne, Montour, Northumberland, Pike and 5 more | 4 hr |
| May 12, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 15 more | 8 hr |
| May 13, 4:28 PM EDT | Severe Thunderstorm Watch | SPC | Bedford, Fayette, Greene, Somerset, Washington, Westmoreland | 7 hr |
| May 14, 12:29 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 16 more | 9 hr |
| May 15, 12:26 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Armstrong, Bedford, Blair, Bradford and 37 more | 7 hr |
| May 15, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 9 hr |
| May 22, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Beaver, Butler, Crawford, Lawrence, Mercer and 2 more | 7 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Washington County6
- Allegheny County5
- Fayette County5
- Greene County5
- Somerset County5
- Westmoreland County5
- Armstrong County4
- Beaver County4
- Butler County4
- Cambria County4
- Indiana County4
- Bedford County4
- Adams County3
- Blair County3
- Cumberland County3
- Franklin County3
- Fulton County3
- Huntingdon County3
- Juniata County3
- Mifflin County3
- Perry County3
- Crawford County2
- Bradford County2
- Cameron County2
- Centre County2
- Clearfield County2
- Clinton County2
- Elk County2
- Jefferson County2
- Lawrence County2
- Lycoming County2
- McKean County2
- Mercer County2
- Potter County2
- Sullivan County2
- Tioga County2
- Venango County2
- Columbia County2
- Luzerne County2
- Montour County2
27 more counties
- Northumberland County2
- Snyder County2
- Union County2
- Wyoming County2
- York County2
- Erie County1
- Clarion County1
- Forest County1
- Warren County1
- Lackawanna County1
- Pike County1
- Susquehanna County1
- Wayne County1
- Dauphin County1
- Lancaster County1
- Lebanon County1
- Schuylkill County1
- Berks County1
- Bucks County1
- Carbon County1
- Chester County1
- Delaware County1
- Lehigh County1
- Monroe County1
- Montgomery County1
- Northampton County1
- Philadelphia County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20172019
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.