Flash Flood in Seneca County, Ohio

Multiple locations along a several mile stretch of U.S. 224 between Tiffin and Attica with 6 to 8 inches of flowing water across the roadway. Radar estimated 1.5 to 2.5 inches of rainfall in just under one hour leading up to the flash flooding, in addition to the 1.5 to 2.75 inches of rain that fell in the previous six hours before the flash flood causative torrential rainfall.

A weak warm front lifted north across northern Ohio early in the day on July 16, 2025, bringing a warm and unstable airmass to the region. A shortwave trough lifting northeast across the region during the day promoted scattered shower and thunderstorm activity. Repeated rounds of rainfall affected Seneca County during the day, with particularly intense rainfall during the early evening hours bringing flash flooding impacts. Heavy rainfall rates were influenced by ample moisture in the atmosphere, with precipitable water values exceeding 2 inches, modest instability with mixed layer CAPE around 1500 j/kg, and weak shear/slow moving storms.