Alert archive / Pennsylvania / Severe Thunderstorm Watches

Severe Thunderstorm Watches in Pennsylvania, 2009

29 severe thunderstorm watches in 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 watches reaches back to 1997.

Severe Thunderstorm Watches by county

Each county as a circle sized by its count in 2009. Tap one for its archive.

Severe Thunderstorm Watches
29
Busiest month
June10 severe thunderstorm watches
Busiest day
June 25, 20093 severe thunderstorm watches

Over time

By month

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.

IssuedProductOfficeCountiesLasted
Feb 11, 5:53 PM ESTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 19 more4 hr
Feb 11, 8:19 PM ESTSevere Thunderstorm WatchSPCAdams, Cameron, Centre, Clinton, Columbia, Cumberland and 19 more3 hr
May 16, 1:00 PM EDTSevere Thunderstorm WatchSPCAdams, Allegheny, Armstrong, Beaver, Bedford, Blair and 48 more7 hr
May 29, 1:26 PM EDTSevere Thunderstorm WatchSPCAdams, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more8 hr
Jun 2, 1:58 PM EDTSevere Thunderstorm WatchSPCBucks, Chester, Delaware, Montgomery, Philadelphia6 hr
Jun 9, 1:31 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Blair, Bradford, Carbon and 31 more6 hr
Jun 17, 9:56 PM EDTSevere Thunderstorm WatchSPCAllegheny, Fayette, Greene, Washington, Westmoreland3 hr
Jun 19, 6:28 PM EDTSevere Thunderstorm WatchSPCAllegheny, Beaver, Bedford, Fayette, Greene, Somerset and 2 more3 hr
Jun 25, 12:38 PM EDTSevere Thunderstorm WatchSPCBradford, Susquehanna7 hr
Jun 25, 2:08 PM EDTSevere Thunderstorm WatchSPCCrawford, Erie8 hr
Jun 25, 5:30 PM EDTSevere Thunderstorm WatchSPCCarbon, Lackawanna, Luzerne, Monroe, Pike, Wayne and 1 more5 hr
Jun 26, 12:32 PM EDTSevere Thunderstorm WatchSPCBradford, Cameron, Clinton, Elk, Lackawanna, Luzerne and 9 more6 hr
Jun 26, 2:42 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Blair, Bucks, Carbon and 26 more7 hr
Jun 30, 11:37 AM EDTSevere Thunderstorm WatchSPCBerks, Bucks, Carbon, Chester, Delaware, Lackawanna and 10 more7 hr
Jul 7, 11:05 AM EDTSevere Thunderstorm WatchSPCCarbon, Lehigh, Monroe, Northampton8 hr
Jul 16, 1:39 PM EDTSevere Thunderstorm WatchSPCSusquehanna, Wayne6 hr
Jul 25, 3:50 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Blair, Bradford, Cambria, Cameron and 27 more5 hr
Jul 26, 3:51 PM EDTSevere Thunderstorm WatchSPCAdams, Berks, Bucks, Carbon, Chester, Cumberland and 19 more7 hr
Jul 29, 12:49 PM EDTSevere Thunderstorm WatchSPCBerks, Bucks, Carbon, Chester, Delaware, Lackawanna and 10 more8 hr
Jul 31, 1:18 PM EDTSevere Thunderstorm WatchSPCBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more7 hr
Aug 9, 11:57 AM EDTSevere Thunderstorm WatchSPCBradford, Cameron, Clarion, Crawford, Elk, Erie and 8 more6 hr
Aug 9, 3:18 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Blair, Bucks, Cambria and 36 more5 hr
Aug 9, 10:44 PM EDTSevere Thunderstorm WatchSPCBradford, Cameron, Clinton, Columbia, Elk, Lycoming and 11 more4 hr
Aug 10, 3:13 PM EDTSevere Thunderstorm WatchSPCArmstrong, Beaver, Bradford, Butler, Cameron, Clarion and 13 more8 hr
Aug 10, 5:09 PM EDTSevere Thunderstorm WatchSPCAdams, Allegheny, Beaver, Bedford, Berks, Blair and 38 more5 hr
Aug 20, 2:41 PM EDTSevere Thunderstorm WatchSPCBeaver, Crawford, Erie, Lawrence, Mercer7 hr
Aug 20, 6:54 PM EDTSevere Thunderstorm WatchSPCArmstrong, Cambria, Cameron, Clarion, Clearfield, Elk and 9 more5 hr
Aug 21, 10:47 AM EDTSevere Thunderstorm WatchSPCLackawanna, Pike, Wayne7 hr
Aug 21, 11:28 AM EDTSevere Thunderstorm WatchSPCAdams, Berks, Bucks, Carbon, Chester, Cumberland and 11 more7 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

27 more counties

The busiest days

Days with the most alerts issued, by UTC date.

  1. June 25, 20093severe thunderstorm watches
  2. August 10, 20093severe thunderstorm watches
  3. June 26, 20092severe thunderstorm watches
  4. August 9, 20092severe thunderstorm watches
  5. August 20, 20092severe thunderstorm watches
  6. August 21, 20092severe thunderstorm watches
  7. February 11, 20091severe thunderstorm watches
  8. February 12, 20091severe thunderstorm watches
  9. May 16, 20091severe thunderstorm watches
  10. May 29, 20091severe thunderstorm watches
  11. June 2, 20091severe thunderstorm watches
  12. June 9, 20091severe thunderstorm watches

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.