Weather alerts in Pennsylvania, 2020
2,678 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 2,678
- Warnings
- 853
- Watches
- 104
- Advisories
- 477
- Busiest month
- July560 alerts
- Busiest day
- May 29, 202088 alerts
Over time
By month
The alerts
2,678 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 County276
- Montgomery County273
- Bucks County267
- Delaware County229
- Philadelphia County219
- Berks County213
- Lehigh County205
- Northampton County203
- York County184
- Lancaster County181
- Monroe County160
- Allegheny County155
- Westmoreland County155
- Butler County150
- Armstrong County146
- Wayne County144
- Carbon County139
- Adams County139
- Lebanon County137
- Dauphin County136
- Cumberland County135
- Franklin County132
- Washington County132
- Schuylkill County132
- Susquehanna County129
- Beaver County129
- Lawrence County126
- Centre County125
- Fayette County123
- Erie County120
- Pike County120
- Clarion County119
- Mercer County119
- Clearfield County118
- Huntingdon County117
- Somerset County116
- Bradford County114
- Jefferson County113
- Venango County112
- Perry County110
27 more counties
- Fulton County109
- Cambria County109
- Bedford County108
- Luzerne County108
- Clinton County107
- Mifflin County107
- Union County107
- Northumberland County106
- Juniata County105
- Lycoming County105
- Snyder County105
- Lackawanna County104
- Wyoming County102
- Columbia County101
- Blair County96
- Crawford County96
- Sullivan County94
- Montour County93
- Indiana County91
- Greene County90
- Cameron County86
- Tioga County86
- Forest County85
- Warren County82
- Elk County79
- McKean County77
- Potter County68
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.