Digging more into this: http://www.whatdoesitmean.com/index3432.htm?fbclid=IwAR2H6fpZ99H1UDL1S1ogxu0B6OdeDtnq7NWGhLY1_zRY38d8KP37Q8KvI1g

Hypothesis that the bomb was dropped from an air platform. Probably going to be inconclusive, but can any planfags determine if there were any military aircraft in the Nashville region around 5:30 CST Christmas morning?