Weather alerts in Pennsylvania, 2009
1,951 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 1,951
- Warnings
- 697
- Watches
- 123
- Advisories
- 483
- Busiest month
- June430 alerts
- Busiest day
- June 26, 200974 alerts
Over time
By month
The alerts
1,951 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.
- Lancaster County228
- York County225
- Dauphin County172
- Philadelphia County171
- Adams County166
- Lebanon County166
- Delaware County164
- Cumberland County162
- Schuylkill County161
- Lycoming County155
- McKean County155
- Somerset County151
- Franklin County142
- Huntingdon County142
- Cambria County141
- Elk County140
- Tioga County140
- Warren County139
- Centre County138
- Wayne County138
- Clearfield County137
- Clinton County136
- Northumberland County134
- Berks County134
- Potter County134
- Monroe County131
- Carbon County130
- Cameron County130
- Columbia County129
- Perry County129
- Montgomery County129
- Blair County128
- Northampton County128
- Bedford County126
- Sullivan County126
- Chester County126
- Montour County124
- Mifflin County122
- Bucks County122
- Lehigh County121
27 more counties
- Lackawanna County121
- Union County119
- Juniata County117
- Snyder County116
- Luzerne County115
- Susquehanna County111
- Fulton County107
- Crawford County106
- Pike County106
- Wyoming County104
- Erie County101
- Bradford County100
- Allegheny County97
- Forest County94
- Jefferson County92
- Armstrong County90
- Clarion County87
- Washington County87
- Venango County86
- Beaver County83
- Lawrence County81
- Greene County79
- Mercer County78
- Butler County75
- Fayette County53
- Westmoreland County50
- Indiana County44
The busiest days
Days with the most alerts issued, by UTC date.
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. Rebuilt daily.