sonic boom
An F/A-18 breaking the sound barrier. Sometimes weather conditions can reflect sonic booms back toward shore. In this case the Navy denied exercises in the area.
If there is one constant on the Outer Banks, it has to be the noise. Not to the level of noise in New York City, but noise nonetheless.

Gentle lapping waves on the soundside, or pounding surf on the oceanside. The ever-present wind rustling through marsh grass. Insects, frogs, and birds singing their vari-BOOOOOOM!

Wednesday was another one of those mornings where everyone, from the fifth generation native to the visitor who just pulled into a rental cottage for the first time, immediately yells, "What the heck was that!?"

At least three separate almost ear-shattering booms were heard from Corolla to Manteo, and on the mainland of Currituck County, between 10:50 a.m. and noon.

But what was it? No one really knows.

The Navy said they don't have any activities going on nearby to produce a sonic boom, although it can't be ruled out as the cause.

"All branches of the military use an area well off the coast over the Atlantic, where jets are allowed to operate at supersonic speed," said Navy spokesman Mike Moss. He estimated the area is about 100 miles east of the Outer Banks.

"Sometimes, weather conditions can reflect the noise of sonic booms back towards shore," Moss said.

Naval exercises being conducted offshore was the explanation given when another loud boom was heard and felt up and down the beaches on the evening of July 22.

But Moss said there was really no way of knowing if that was the cause of what was heard Wednesday.

The Navy and Air Force jointly operate a bombing range on the Dare County mainland, but live explosives are not used and planes are not allowed to break the sound barrier when they fly in the vicinity, Moss added.

Seismic testing of the continental shelf using air guns underwater is being proposed off the Outer Banks, but that is not slated to begin until this fall, if approval is given.

So what could it have been?

We published a story in 2012 about the number of theories out there entitled "Mysterious coastal booms have legendary roots".

Other than that, we just don't know.