It was around this time in 1972 that the remnants of Hurricane Agnes impacted the area. I’ve always been interested in that storm.
The storm made landfall over Florida on June 19th and then moved northeast and weakened to a tropical depression. It became a tropical storm again over North Carolina and moved made another landfall near New York City on June 22.
It produced 6 to 12 inches of rain in Pennsylvania. with locally more. It caused plenty of flooding in the area. The Susquehanna River flooded and threatened the Conowingo Dam. The water rose to within 5 inches of the top.
We’ve had similar amounts of rain since then but never anything close to the results of Agnes. It’s been dry before the more recent heavy rainfall event unlike Agnes which it hadn’t been dry before the event.