A flood catastrophe ensued — worse than any before or since — spurred by an improbable source: a scrappy tropical storm named Agnes. AdvertisementNo region was harder hit than the Susquehanna River basin. The depression quickly gained strength and was declared Tropical Storm Agnes the next day. The depression moved over the North Carolina Outer Banks into the Atlantic, where it intensified into a tropical storm. AdvertisementExtraordinary flooding occurred throughout this zone, with some of the worst of it focused along the Susquehanna River and its tributaries.

Source: Washington Post June 20, 2022 04:29 UTC