When I did a lot of wilderness hiking in my teens, at some locations these sounds (and accompanying flashes in the night sky) would/could be common. Especially if "camping in the right spot," -- and on clear nights -- the flashes and "booms" would be quite active on "some nights." They were "site specific" from the standpoint of "general location," but not in terms of any particular point of origin. There is, in fact, a form of lightning that is distinctive for NOT being associates with clouds or storms, but rather, coming from a "clear sky." If you are in the "right place" and the right time, the demonstration can be quite active, all night long. "Night" is a key part of the observation because the "light" -- lightning -- is both more easily seen and heard at night. These are very "site specific" and associated with those location but, any other 1000 square miles, rare if ever. That, I concluded, is why they are associated with a specific location, rather than an active storm process.
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