Weather alerts in Pennsylvania, 2011
4,168 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 4,168
- Warnings
- 1,451
- Watches
- 250
- Advisories
- 656
- Busiest month
- September660 alerts
- Busiest day
- August 19, 2011150 alerts
Over time
By month
The alerts
4,168 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Philadelphia County366
- Delaware County363
- Monroe County336
- Berks County313
- Dauphin County313
- York County312
- Northampton County309
- Carbon County289
- Lycoming County284
- Lehigh County283
- Cumberland County283
- Lancaster County277
- Lebanon County274
- Bradford County273
- Schuylkill County268
- Montgomery County262
- Northumberland County259
- Perry County259
- Bucks County256
- Allegheny County253
- Columbia County251
- Luzerne County251
- Wayne County251
- Chester County251
- Westmoreland County248
- Susquehanna County247
- Adams County247
- Franklin County234
- Sullivan County230
- Wyoming County230
- Snyder County229
- Union County227
- Huntingdon County225
- Montour County220
- Tioga County218
- Clinton County217
- Juniata County216
- Lackawanna County214
- Bedford County210
- Fayette County210
27 more counties
- Centre County208
- Mifflin County199
- Blair County196
- Pike County195
- Fulton County193
- Beaver County191
- Somerset County189
- Washington County184
- Butler County183
- Cambria County177
- Armstrong County176
- Lawrence County176
- Potter County171
- McKean County170
- Greene County170
- Mercer County169
- Clearfield County167
- Erie County165
- Venango County158
- Crawford County155
- Clarion County153
- Warren County149
- Elk County147
- Jefferson County143
- Forest County139
- Cameron County133
- Indiana County129
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20102012
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. Rebuilt daily.