Then, meteorologist Wayne Hart of WEHT-TV attempted to clear the confusion with a tweet Tuesday saying an unnamed pilot confirmed the blip was caused by chaff - radar-jamming material sometimes used during training exercises - from a military C-130 airplane.
There are two military bases in the area: Fort Campbell in Kentucky and Scott Air Force Base in Western Illinois. Neither are claiming responsibility for possible chaff.
“Whatever aircraft it was, it was not a Scott Air Force Base craft,” Master Sgt. Thomas Doscher, of Scott Air Force Base, told the Courier and Press.
A spokesman for Fort Campbell wasn't as unequivocal, the newspaper reported, but said he wasn't aware of any such operation -- unless it was involved in a secret special forces exercise.
The Federal Aviation Administration couldn't be reached by Fox News for comment Wednesday.