Thunderstorm Wind in Crawford County, Pennsylvania

Tree downed in Springboro.

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 northwest Pennsylvania, with slow-moving and back-building storms along a lake breeze front in far-northeast Erie County in Pennsylvania, which brought flash flooding. 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 entered northwest Pennsylvania in the late evening and generated isolated straight-line wind damage in western Crawford County before weakening farther east. These storms traversed an ambient environment comprised of moderate to strong effective bulk shear and weak to moderate MUCAPE.