Thunderstorm Wind in Ashtabula County, Ohio

Two trees downed in Jefferson, including one on North Spruce Street.

At the surface, a wavy warm front swept eastward from Lake Michigan, southern Lower MI, and western OH to southern Lake Huron, southwestern ON, eastern Lake Erie, and northwestern PA as an occluded low drifted from central Lake Superior to central ON during the mid-morning through early afternoon hours of the 29th. Multiple lines of multicell showers and thunderstorms developed and persisted generally eastward along and ahead of the surface warm front amidst weak to moderate MUCAPE and DCAPE, respectively, and moderate to strong effective bulk shear. A very brief mesovortex-related tornado occurred in Huron County, amidst surface-based effective storm-relative helicity near 150 to nearly 200 meters squared per second squared and mixed layer LCL's between 750 meters and 1000 meters AGL. Isolated straight-line convective wind damage impacted Lorain and Cuyahoga Counties.