EF0 tornado in Grayson County, Kentucky

The National Weather Service conducted the storm survey.

A bow echo passed through Grayson County and quickly spun up just south of Clarkson. It dropped a very brief tornado at 3900 Millerstown Road. A large 30ft x 40ft garage was mostly destroyed. A large beam from the garage was thrown into the sidewall of the home residence adjacent to the garage. The house also sustained some minor roof, siding, and gutter damage.

Across the street, a one-story family residence sustained roof and shingle damage with one of the front windows blown out.

Debris from the garage and one-story family residence was thrown up to a quarter-mile eastward into the forest. There were a couple of snapped and uprooted trees in the forest, but the most impressive damage was just beyond the small wooded area where a very noticeable ground grinding swirl could be seen across the farmers field. It measured approximately 40 yards wide, which was seen very clearly from a NWS aerial drone.

There were no signs of any damage beyond the farmers field, where the swirls ended abruptly.

Early in the day, low level wind shear was very strong. A stable layer over the area allowed a warm front to bring sunshine and warmer temperatures to the region, but the warming surface temperatures caused the stable layer to erode and become unstable. The high shear environment allowed storms, ahead of a cold front, to become severe and severe hail, damaging winds, and three tornadoes resulted.