Weather alerts in Pennsylvania, 2017
2,849 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 2,849
- Warnings
- 845
- Watches
- 108
- Advisories
- 589
- Busiest month
- July583 alerts
- Busiest day
- August 4, 201796 alerts
Over time
By month
The alerts
2,849 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.
- Montgomery County235
- Bucks County228
- Berks County217
- Chester County198
- Allegheny County192
- Philadelphia County191
- Lehigh County187
- Northampton County182
- Westmoreland County181
- Delaware County177
- Erie County173
- York County164
- Susquehanna County162
- Dauphin County161
- Lebanon County160
- Huntingdon County156
- Cumberland County155
- Lancaster County155
- Washington County155
- Butler County155
- Monroe County154
- Fayette County152
- Bradford County152
- Beaver County146
- Clearfield County144
- Perry County144
- Blair County142
- Franklin County142
- Luzerne County141
- Cambria County140
- Carbon County139
- Bedford County137
- Lycoming County137
- Armstrong County137
- Clinton County135
- Adams County134
- Centre County134
- Schuylkill County132
- Wayne County132
- Mifflin County131
27 more counties
- Lackawanna County131
- Juniata County128
- Clarion County128
- McKean County127
- Somerset County124
- Warren County124
- Lawrence County122
- Fulton County121
- Northumberland County121
- Mercer County121
- Elk County119
- Venango County118
- Crawford County117
- Montour County115
- Tioga County115
- Greene County115
- Potter County113
- Wyoming County113
- Snyder County112
- Columbia County111
- Sullivan County110
- Union County110
- Cameron County107
- Indiana County100
- Jefferson County97
- Forest County92
- Pike County91
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.