Weather alerts in Pennsylvania, 2021
3,463 weather alerts in 2021, 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 2021. Tap one for its archive.
- Alerts
- 3,463
- Warnings
- 1,219
- Watches
- 156
- Advisories
- 564
- Busiest month
- July1,019 alerts
- Busiest day
- June 21, 2021123 alerts
Over time
By month
The alerts
3,463 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.
- Bucks County317
- Montgomery County266
- Lancaster County251
- Chester County246
- Philadelphia County243
- Delaware County230
- Westmoreland County228
- Allegheny County224
- Northampton County222
- Berks County221
- York County215
- Susquehanna County206
- Wayne County204
- Lehigh County204
- Washington County203
- Bradford County201
- Lycoming County197
- Dauphin County195
- Monroe County192
- Lackawanna County190
- Luzerne County189
- Centre County183
- Lebanon County181
- Carbon County177
- Sullivan County166
- Wyoming County163
- Columbia County161
- Cumberland County160
- Butler County159
- Schuylkill County159
- Fayette County158
- Pike County157
- Perry County156
- Union County155
- Northumberland County154
- Clinton County153
- Snyder County151
- Juniata County147
- Beaver County146
- Montour County143
27 more counties
- Armstrong County142
- Mifflin County142
- Adams County140
- Clearfield County139
- Huntingdon County137
- Erie County136
- Franklin County135
- Tioga County134
- Cambria County129
- Blair County128
- Crawford County128
- Somerset County122
- Venango County121
- Greene County120
- Indiana County119
- Jefferson County115
- Potter County110
- McKean County109
- Clarion County108
- Elk County108
- Warren County107
- Bedford County106
- Mercer County105
- Lawrence County103
- Forest County100
- Cameron County98
- Fulton County93
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.