EF0 tornado in Knox County, Ohio

This very brief EF0 tornado with estimated peak winds of 75-mph began just west of Granny Creek Road, southwest of Fredericktown. The tornado ripped off part of a barn's metal roof and scattered the debris southeastward before the tornado ended in vicinity of the road. Radar data suggest this tornado was associated with an anticyclonic mesovortex along the equatorward side of the descending rear-inflow jet of a bow echo and the bow echo was embedded in the flanking line of a cyclonic supercell.

At the surface, a cold front moved from the southern Great Lakes region to the Upper and Middle Ohio Valley during the early afternoon through late evening hours of the 26th as a low moved east-northeastward from southern Quebec to the Gulf of Saint Lawrence. Along and ahead of the front, scattered multicell and isolated supercell thunderstorms impacted northern Ohio as the storms persisted generally eastward or southeastward during the late afternoon through mid-evening hours of the 26th, amidst moderate to strong effective bulk shear and weak to moderate MUCAPE. The storms produced sporadic straight-line convective wind damage and severe hail. Two weak tornadoes occurred; one in Morrow County and the other in Knox County, where mixed layer LCL's were favorably-low and surface-based ESRH was maximized due to southwesterly low-level jet development.