1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The Pittsburgh radar (KPBZ), 49 km away, was scanning. The volume nearest the first event began at 15:35 UTC.
1 flash flood. Local standard time, as filed.
Heavy thunderstorm rains led to widespread flooding across Butler County. The Little Buffalo Creek and small tributary streams of the Connoquenessing River went out of their banks. About 100 basements flooded throughout the county. Several roads were also flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 1997Every state in 1997This day in weather historyWarnings in Pennsylvania, May 1997
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5615096.