The NWS later determined that \"the leading theory\" for the cause of the blip was chaff from an aircraft, which is a stream or cloud of radar-jamming material such as thin aluminum that is often used as a countermeasure during combat.

The leading theory is chaff that originated in far southern Richland County IL around 2:50 PM this afternoon. Here is a 6.5 hour loop.... pic.twitter.com/eVwEbLVsQ7

— NWS Paducah (@NWSPaducah) December 11, 2018

Wayne Hart, meteorologist for ABC Evansville, Indiana, affiliate WEHT, tweeted that the chaff came from a military C-130 northwest of Evansville, citing an unnamed pilot who was given the information from the Evansville air traffic control.

Information from a pilot appears to confirm that chaff was the mysterious radar echo that traversed #tristatewx late Monday afternoon/evening. Pilot was told by EVV Air Traffic Control that chaff was released by a military C130 northwest of Evansville. @NWSPaducah

— Wayne Hart (@Wayne_C_Hart) December 11, 2018
\"PHOTO:
STOCK/Getty Images
PHOTO: An undated stock photo of a C-130 military plane.
>

The two military bases nearest to where the blip occurred denied that the C-130 came from their premises.

\"PHOTO:
Mary Knox Merrill/The Christian Science Monitor/Getty Images
PHOTO: One of the entrances to the Fort Campbell military base in Fort Campbell, Kentucky, March 14, 2008.
>

Major Martin Meiners, public affairs officer for the 101st Airborne Division for Fort Campbell in Hopkinsville, Kentucky, told ABC News that there are no units at that base that fly C-130s.

\"PHOTO:
Derik Holtmann/Belleville News-Democrat/AP
PHOTO: The main entrance to Scott Air Force Base near Mascoutah, Ill., June 10, 2013.
>

A spokesman for Scott Air Force Base in St. Clair County told the Evansville Courier & Press that the plane did not come from that base, either.

A representative for the Air Force did not immediately respond to ABC News' request for comment.

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