Any late season, strong hurricane that hits that area, can do the same thing. A several hundred miles long arm of the hurricane trained on the mountain range in NC/TN, and the mountains' cold air wrung out thirty inches of precipitation.
30 inches of rain in a couple days, will destroy most places.
The National Weather Service, the National Oceanic and Atmospheric Administration, and\or the National Hurricane Center should have warned people that 15-30 inches of precipitation is probably deadly.