Weather alerts in Pennsylvania, 2010
2,803 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 2,803
- Warnings
- 907
- Watches
- 217
- Advisories
- 404
- Busiest month
- July627 alerts
- Busiest day
- December 1, 201095 alerts
Over time
By month
The alerts
2,803 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.
- Delaware County244
- York County243
- Lancaster County236
- Philadelphia County235
- Berks County215
- Allegheny County209
- Dauphin County206
- Cumberland County204
- Lebanon County201
- Lehigh County196
- Northampton County196
- Cambria County185
- Carbon County184
- Franklin County183
- Clinton County181
- Adams County181
- Clearfield County179
- Centre County179
- Schuylkill County177
- Lycoming County177
- Chester County177
- McKean County176
- Monroe County175
- Perry County175
- Elk County174
- Somerset County173
- Montgomery County173
- Northumberland County171
- Union County169
- Bedford County168
- Bucks County166
- Butler County165
- Cameron County165
- Potter County164
- Blair County163
- Snyder County163
- Huntingdon County162
- Beaver County159
- Wayne County158
- Mifflin County153
27 more counties
- Warren County152
- Juniata County152
- Washington County151
- Columbia County150
- Westmoreland County149
- Lawrence County148
- Susquehanna County147
- Forest County145
- Clarion County145
- Lackawanna County144
- Mercer County142
- Jefferson County141
- Montour County141
- Erie County139
- Bradford County139
- Fulton County139
- Luzerne County134
- Tioga County134
- Armstrong County133
- Venango County132
- Wyoming County131
- Sullivan County131
- Pike County127
- Crawford County125
- Fayette County125
- Greene County121
- Indiana County104
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.