From an Unknowncountry reader:
"I have something to add to the catalog of strange sounds being reported from around the world. I live about 40 minutes from theNaval Air Station. Helicopters overhead are common and the pilot trainees do touchdown landings less than a mile from my house. So, I am used to sound in the sky. But, on occasion I hear what I can best describe as the very loud roar we would hear in a WWII movie scene of a group of propellar planes simultaneously preparing for takeoff. I’ve heard this many times, have taken a look out the window, but missed whatever it was (I thought). But, today the roar was the loudest I have every heard. It sounded like that group of WWII planes was flying low over my house. I went outside and scanned a clear blue, but empty sky. I waited, but nothing came into view. After a few minutes the sound receded toward the West, then returned for a bit, then receded again. I heard it once more, but it was distant. I think the whole episode lasted 15 or 20 minutes. I checked with a friend…she heard it also."
If you have noticed anything similar in your area, please write firstname.lastname@example.org and let us know.