EF3 tornado in Graves County, Kentucky

Dozens of structures were destroyed, including mobile homes, businesses, barns, and garages. Several homes received major damage or were destroyed. Many dozens of other homes and businesses received minor damage, mainly loss of shingles and fascia. Several dozen cars were damaged or destroyed. Some cars were tossed around and lofted atop other cars or structures. Thousands of trees were snapped, uprooted, or broken. The tornado was captured on video or camera by numerous individuals. The tornado appeared to have more than one vortex at several different points along its path. The tornado moved through some residential and commercial neighborhoods just outside the northern city limits of Mayfield. A car dealership on U.S. Highway 45 right near the city limit received extensive damage, including the loss of almost all 40 vehicles on the lot as well as a nearby storage building. The peak wind speed of 140 mph was assigned at this car lot. A flea market type of business on Highway 121 just outside Mayfield was destroyed by winds near 135 mph. Once the tornado reached the northern edge of Mayfield, it tracked almost parallel to the Purchase Parkway (future Interstate 69). The center of the tornado stayed about one-half mile north of the parkway, crossing Kentucky Highways 131 and 301 prior to reaching the Marshall County line. The average path width was approximately 300 yards. Peak wind speeds were estimated near 140 mph. The tornado continued into Marshall County very close to where the parkway crosses the county line.

An outbreak of supercells with large hail and isolated tornadoes affected western Kentucky during the afternoon and early evening. The initial round of thunderstorms occurred early in the afternoon over northwest Kentucky. These storms, which produced a major hailstorm and flash flood in the Owensboro area, were triggered by a weak upper-level low over northern Illinois. This initial round of thunderstorms produced an outflow of cooler air that settled south into southwest Kentucky. By mid-afternoon, isolated supercells with tornadoes fired up along the leading edge of cooler air. Strong westerly upper-level winds associated with the upper-level low over Illinois provided ample wind shear for supercells. A southwest wind flow of moist and unstable air in the lower levels of the atmosphere provided fuel for the storms. Low-level winds up to around 40 knots enhanced low-level wind shear, providing a favorable environment for tornadoes. The supercells lingered well into the evening.