Areas of Houston, central Humphreys, and northern Hickman counties still received upwards of 8 to 10 inches (200 to 250 mm) of rain during the event.
However, the headwaters of Trace Creek originate in eastern parts of the county, with all the water draining westward through Waverly. Įastern Humphreys County, around the McEwen area, received substantially more rainfall than Waverly. Months later, in December, another rain gauge in McEwen, located at the McEwen Wastewater Treatment Plant, was officially verified as the state record, having recorded 20.73 inches (527 mm) of rain, breaking the previous record by slightly over 7 inches (180 mm). The previous highest daily record rainfall in Middle Tennessee was 9.45 inches (240 mm) in Franklin in May 2010, and the two-day total for Nashville in 2010 was 13.57 inches (345 mm). This broke the previous record of 13.6 inches (350 mm) recorded in Milan in 1982. A rain gauge operated by the Tennessee Valley Authority in McEwen recorded 17.02 inches (432 mm) of rain, setting a provisional daily rainfall record in Tennessee. By daybreak, numerous homes and businesses had been flooded in Humphreys County, leading to evacuations and water rescues. Rain started shortly after midnight and intensified throughout the morning, quickly filling area creeks and streams. CDT, besting the previous record of 2.21 inches (56 mm) for that specific date and time.
Precipitable water values reached as high as 2.37 inches (60 mm) at 7:00 a.m. Ī stalled frontal boundary west of Nashville led to training thunderstorms during the early hours of August 21, producing very heavy rainfall rates across the counties of Stewart, Houston, Dickson, Humphreys, and Hickman. Flooding also occurred in parts of western Kentucky, but to a much lesser extent. The event broke the 24-hour rainfall record in Tennessee, with over 20 inches (510 mm) of rain falling in McEwen. The event resulted in 19 fatalities in Waverly, with another in nearby Hurricane Mills, and is regarded as one of the worst natural disasters in Tennessee history. Numerous people became trapped, leading to widespread water rescues.
In a situation described as catastrophic, Waverly was severely damaged by floodwater, with hundreds of homes and dozens of businesses destroyed and swept away. During the event, much of a five-county area received up to a quarter of normal annual rainfall in under twelve hours, as much as 10 to 15 inches (250 to 380 mm). Western Middle Tennessee, Western Kentucky ( Jackson Purchase)īetween midnight and 10:00 am CDT on Saturday, August 21, 2021, very heavy rainfall resulted in widespread flash flooding across western Middle Tennessee, including the town of Waverly. Radar estimated 24-hour rainfall over western Middle Tennessee ending at 9:00 a.m.
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