Scattered thunderstorms formed over western Kentucky, southeast Illinois, and southwest Indiana on Friday afternoon. One of the storms intensified to severe levels over Trigg County, Kentucky. As this storm approached Cadiz, it acquired supercellular characteristics. Based on low level rotation depicted by doppler radar, a Tornado Warning was issued for parts of Trigg County.
A National Weather Service meteorologist who happened to be in the area took photos of the rotating wall cloud produced by this storm. A wall cloud is the forerunner of a funnel cloud. Below are a couple of photos taken by the meteorologist in eastern Trigg and western Christian Counties.
Below is a radar image of the storm from the Fort Campbell radar (near Hopkinsville). The storm of interest is the storm nearest the center of the image. Note the hook-shaped appendage on the western side of the storm.