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A loud sonic boom was heard and felt across North Alabama – from Blount, Jefferson, Walker, Cullman, Talladega, Calhoun, Clay, Winston, Randolph, Tuscaloosa, and St. Clair counties, but also in Columbus, Mississippi – shortly after 13:40 CST (19:40 UTC) on November 14, 2017. At this time, NASA was only able to say: the origin of large boom over Alabama is a mystery.



 Loud boom recorded by the U.S. Geological Survey’s Lakeview Retreat near Centreville, Ala.. The sound graph shows a loud boom heard over Alabama at about 1:39 p.m. CST. The cause of the boom is still unknown.

This is what officials know so far:

1. Seismic data from the U.S. Geological Survey’s Lakeview Retreat near Centreville, Alabama, show a fairly loud boom occurring on or before 13:39 CST.

2. The Elginfield Infrasound Array in southern Ontario 965 km (600 miles) from North Alabama “picked up a matching infrasound signal beginning at 14:02 and lasting around 10 minutes.” NASA said the signal “could have been generated by a bolide, larger supersonic aircraft or a ground explosion.”

3. Eyewitnesses reported a vapor trail, and NASA said that points to a meteor or aircraft.

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