Flash Flood in Ashtabula County, Ohio

Widespread basement and street flooding in Ashtabula, with several videos of flowing water of six inches or more across roadways. Radar estimated 2.75 to 3.5 inches of rainfall in a two to three hour period, which roughly equates to a 50 year recurrence interval.

A slow-moving cold front was draped west to east across the southern Great Lakes during the day of June 18th, 2025, with low pressure near Chicago drifting east toward southern Ontario. An upper-level shortwave trough moving eastward across the southern Great Lakes during the afternoon brought scattered showers and thunderstorms to portions of northern Ohio, with slow-moving and back-building storms along a lake breeze front in far-northeast Ohio, which brought flash flooding to portions of Ashtabula County. A quasi-linear convective system organized and strengthened across Illinois and Indiana during the afternoon and early evening hours, and moved eastward across northern Ohio during the evening. This line of storms generated widespread damaging straight-line wind gusts up to approximately 80 mph and three tornadoes in northern Ohio. All of these storms occurred amidst moderate to strong effective bulk shear and primarily weak to moderate MUCAPE.