“[T]he chance of getting over 17 inches of rain in 24 hours in any year at Waverly, TN is much more rare than 1 in 1,000,” wrote Geoffrey Bonnin, a hydrologist retired from the National Oceanic and Atmospheric Administration (NOAA), in a Facebook message to the Capital Weather Gang. He said that amount of rain is so rare that NOAA doesn’t have sufficient historical data to quantify it any further.

Source: Washington Post August 23, 2021 16:51 UTC