Strongest Tornadoes Recorded in Pennsylvania
The highest tornado rating, longest recorded path, casualties, and rating caveats in Pennsylvania’s SPC historical archive.
The highest rating in Pennsylvania’s 1950–2024 archive is F/EF4. The strongest entry shown here occurred on May 31, 1985 and had a recorded path length of 69.0 miles.
The highest rating in the archive
The strongest rating represented in Pennsylvania is F/EF4. When several records share that rating, this page highlights the one with the longest recorded path: 69.0 miles on May 31, 1985.
This is a database summary, not a definitive ranking of every historical tornado. Early events may have incomplete paths or retrospective ratings.
Rating is based on damage
Survey teams assign EF ratings by examining damage indicators and degrees of damage. The scale estimates a wind range from the damage that occurred; it does not measure every tornado’s maximum wind directly.
A violent tornado crossing open land may leave few indicators, while a lower-rated tornado can still be deadly when exposure and shelter are poor.
Impact across the full record
The state archive totals 1,050 injuries and 49 fatalities. Those human impacts cannot be compared by rating alone because warning access, time of day, construction, population, and storm speed matter.
Use historic events to improve present-day plans: reliable alerts, rapid shelter, head protection, and careful post-storm movement reduce avoidable risk.
Frequently asked questions
What month has the most tornadoes in Pennsylvania?
July has the largest count in the SPC archive used here, with 210 recorded tornadoes. Individual years can differ sharply.
How many tornadoes have been recorded in Pennsylvania?
The archive contains 956 records from 1950 through 2024. The total reflects reporting and database practices as well as weather.
What is the strongest tornado recorded in Pennsylvania?
The highest rating in this archive is F/EF4. Fujita and Enhanced Fujita ratings are damage-based and are not directly interchangeable wind measurements.
Data source and limits
Counts on this page come from the NOAA Storm Prediction Center historical tornado archive for 1950–2024. Older records are less complete, weaker tornado reporting increased with population and technology, and ratings changed from the Fujita scale to the Enhanced Fujita scale in 2007. A record is not a forecast.