Weather alerts in Pennsylvania, 2018
3,225 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 3,225
- Warnings
- 1,012
- Watches
- 180
- Advisories
- 875
- Busiest month
- August651 alerts
- Busiest day
- October 2, 2018124 alerts
Over time
By month
The alerts
3,225 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.
- Chester County301
- Montgomery County282
- Bucks County281
- Delaware County241
- Philadelphia County239
- Westmoreland County236
- Berks County232
- Allegheny County229
- Lancaster County222
- York County217
- Lehigh County204
- Northampton County200
- Bradford County186
- Lebanon County184
- Susquehanna County183
- Fayette County182
- Somerset County181
- Dauphin County179
- Lycoming County177
- Centre County174
- Cumberland County172
- Washington County171
- Bedford County169
- Wayne County168
- Monroe County168
- Schuylkill County167
- Franklin County164
- Adams County161
- Northumberland County160
- Columbia County159
- Luzerne County156
- Cambria County154
- Carbon County154
- Lackawanna County152
- Sullivan County147
- Wyoming County146
- Huntingdon County145
- Fulton County143
- Perry County143
- Pike County142
27 more counties
- Montour County141
- Clearfield County140
- Clinton County140
- Union County140
- Tioga County138
- Blair County136
- Armstrong County131
- Beaver County128
- Greene County125
- Mifflin County125
- Potter County122
- Jefferson County119
- Snyder County119
- McKean County116
- Elk County115
- Butler County115
- Juniata County114
- Warren County106
- Clarion County104
- Mercer County103
- Indiana County100
- Crawford County98
- Cameron County98
- Lawrence County96
- Venango County93
- Erie County90
- Forest County88
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20172019
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.