Does anybody know what the hell this rumbling sound is??? No it's NOT thunder. It's something else entirely. I heard it this morning in Maryland about 20 minute ago to be exact. beautiful sky, no storm, no rain, no lightning. This rumbling is rhythmic, and louder then all the atmospheric noises and encompasses the entire sky yet it is subtle enough that I saw 3 people walk by and not one noticed. I have though seen videos on YT about people who have recorded it.

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