Norristown, PA Tornado History — 88 Tornadoes Since 1950
How many tornadoes has Norristown, PA had?
Norristown has had 88 tornadoes on record within 25 miles since 1950, including 4 strong to violent (EF3+) tornadoes.
When was the most recent tornado near Norristown?
The most recent tornado within 25 miles of Norristown was an EF1 on August 10, 2023.
When is tornado season in Norristown?
July is historically the peak month for tornadoes near Norristown, with 21 on record. April through June account for 26 of the 88 tornadoes on record near Norristown.
At a Glance
Recent Tornado Activity Near Norristown
The last 20 years of confirmed tornadoes within 25 miles — 23 total, averaging 1.1 per year over this window.
Preliminary tornado reports near Norristown since December 29, 2025
This is a preliminary report, not confirmed tornadoes. It has not yet been through an NWS damage survey, and is not counted in the confirmed totals above.
Preliminary reports are revised, merged, and sometimes withdrawn — historically about 23% are consolidated downward once surveys complete. Ratings are omitted until a survey assigns one.
Confirmed records above are complete through December 29, 2025. NOAA publishes the confirmed archive annually, so tornadoes after that date appear here first and move into the totals above once finalized.
A brief tornado occurred in East Caln Township. The first damage was noted just south of the intersection of East Lancaster Avenue and Quarry Road... where several smal (PHI)
Within 25 miles of Norristown. Quoted text is the report narrative exactly as filed. Source: NOAA Storm Prediction Center preliminary storm reports, updated daily.
Tornadoes by Decade
Tornadoes by Enhanced Fujita Rating
F0–F5 ratings (pre-2007) are grouped with their EF equivalents. The Enhanced Fujita scale replaced the original Fujita scale in February 2007.
Tornadoes by Month
Casualties on Record Near Norristown
6 fatalities have been recorded within 25 miles of Norristown since 1950, across 4 events. 104 injuries have been reported across all events. 1994 was the deadliest year on record near Norristown.
The deadliest single event was an F3 on July 27, 1994, which caused 3 fatalities along a 2.0-mile track.
Notable Tornadoes Near Norristown
What the record shows near Norristown
The 1990s were the busiest decade near Norristown, with 27 of the 88 confirmed tornadoes within 25 miles; the 2020s have produced 16 so far. The Norristown record runs from the 1950s to today.
Of the tornadoes rated near Norristown, 68 reached EF0 or EF1 and 20 reached EF2 or stronger. The most intense on record near Norristown is rated EF3, of which 4 are logged.
Across the last 20 years Norristown has averaged 1.1 confirmed tornadoes a year within 25 miles, 23 in total. 2021 was the busiest of them with 9, and 12 of those years passed with none at all.