Alert archive / Pennsylvania / Severe Thunderstorm Watches

Severe Thunderstorm Watches in Pennsylvania, 1999

29 severe thunderstorm watches in 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 watches reaches back to 1997.

Severe Thunderstorm Watches by county

Each county as a circle sized by its count in 1999. Tap one for its archive.

Severe Thunderstorm Watches
29
Busiest month
July16 severe thunderstorm watches
Busiest day
July 6, 19993 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
Mar 3, 6:30 PM ESTSevere Thunderstorm WatchSPCAdams, Berks, Bucks, Carbon, Centre, Chester and 26 more7 hr
Apr 9, 12:30 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Fayette, Greene, Washington and 1 more6 hr
Apr 9, 4:00 PM EDTSevere Thunderstorm WatchSPCBedford, Somerset5 hr
Apr 23, 1:45 PM EDTSevere Thunderstorm WatchSPCAllegheny, Fayette, Greene, Somerset, Washington, Westmoreland5 hr
May 24, 9:05 AM EDTSevere Thunderstorm WatchSPCBerks, Bucks, Chester, Delaware, Lehigh, Monroe and 3 more6 hr
May 24, 1:00 PM EDTSevere Thunderstorm WatchSPCAdams, Berks, Bradford, Bucks, Carbon, Chester and 25 more6 hr
Jun 7, 1:45 PM EDTSevere Thunderstorm WatchSPCBradford, Cameron, Elk, Lackawanna, Lycoming, McKean and 5 more5 hr
Jun 7, 4:30 PM EDTSevere Thunderstorm WatchSPCCarbon, Lackawanna, Lehigh, Luzerne, Monroe, Northampton and 4 more6 hr
Jul 1, 6:45 PM EDTSevere Thunderstorm WatchSPCArmstrong, Butler, Cameron, Clarion, Clearfield, Crawford and 10 more6 hr
Jul 3, 8:45 PM EDTSevere Thunderstorm WatchSPCWayne4 hr
Jul 6, 12:45 PM EDTSevere Thunderstorm WatchSPCBradford, Cameron, Crawford, Elk, Forest, Lycoming and 6 more5 hr
Jul 6, 3:00 PM EDTSevere Thunderstorm WatchSPCWayne6 hr
Jul 6, 6:00 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Bradford, Butler, Cambria and 35 more5 hr
Jul 9, 5:15 PM EDTSevere Thunderstorm WatchSPCBeaver, Butler, Crawford, Erie, Lawrence, Mercer and 1 more6 hr
Jul 9, 6:45 PM EDTSevere Thunderstorm WatchSPCArmstrong, Bradford, Butler, Cameron, Centre, Clarion and 20 more5 hr
Jul 9, 8:00 PM EDTSevere Thunderstorm WatchSPCAllegheny, Bedford, Blair, Cambria, Fayette, Fulton and 6 more4 hr
Jul 9, 10:00 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Bradford, Carbon, Columbia and 27 more5 hr
Jul 23, 6:00 PM EDTSevere Thunderstorm WatchSPCCrawford, Erie, Lawrence, Mercer, Venango6 hr
Jul 24, 3:15 PM EDTSevere Thunderstorm WatchSPCCarbon, Lehigh, Monroe, Northampton, Pike6 hr
Jul 28, 11:00 AM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 11 more6 hr
Jul 28, 10:30 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 9 more6 hr
Jul 31, 4:15 PM EDTSevere Thunderstorm WatchSPCCrawford, Erie, Forest, McKean, Mercer, Potter and 2 more6 hr
Jul 31, 5:45 PM EDTSevere Thunderstorm WatchSPCBradford, Lackawanna, Sullivan, Susquehanna, Wayne, Wyoming6 hr
Jul 31, 7:15 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Blair, Butler, Cambria and 24 more5 hr
Aug 13, 5:15 PM EDTSevere Thunderstorm WatchSPCFayette, Greene, Somerset, Washington, Westmoreland5 hr
Aug 13, 8:15 PM EDTSevere Thunderstorm WatchSPCAdams, Berks, Bucks, Carbon, Chester, Columbia and 19 more4 hr
Aug 14, 2:00 PM EDTSevere Thunderstorm WatchSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 4 more
Oct 13, 3:45 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more6 hr
Oct 13, 6:45 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Blair, Bradford, Cambria, Cameron and 31 more6 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. July 6, 19993severe thunderstorm watches
  2. July 31, 19993severe thunderstorm watches
  3. April 9, 19992severe thunderstorm watches
  4. May 24, 19992severe thunderstorm watches
  5. June 7, 19992severe thunderstorm watches
  6. July 9, 19992severe thunderstorm watches
  7. July 10, 19992severe thunderstorm watches
  8. August 14, 19992severe thunderstorm watches
  9. October 13, 19992severe thunderstorm watches
  10. March 3, 19991severe thunderstorm watches
  11. April 23, 19991severe thunderstorm watches
  12. July 1, 19991severe thunderstorm watches

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.