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I had exactly the same experience a month or two ago. I had even sent a pm to another ATS member about it. My husband figured it probably was military jets flying high above cloud cover. There was ONE day where in fact we knew from local news accounts that the noise was planes. Military jets were doing a lot of activity relating to something going on in Washington DC. But that would only account for two, maybe three days, tops. The stuff I heard went on for at least a couple of weeks. It still recurs from time to time, under bright clear skies and not a plane in sight to explain it all. But I can't discount the possibility of planes due to the fact that when the cause was planes according to my husband, I didn't see any planes then, either. At that time there was just enough cloud cover or it would be too dark when I would go out to investigate.
Originally posted by VariableConstant
Guess I'll throw in my 2 cents, for what it's worth...
I woke up the other night, I think it was a little after 4 a.m., to my dog barking like crazy. She was just standing in the living room, barking and barking, non-stop. I could hear a definite rumbling, low and deep, but I couldn't tell where it was coming from. It sounded a bit like a very large jet, so I went outside to see if it was visible, but I could not see anything. I kept expecting it to get fainter as it moved away, but it was constant, just went on and on, for at least half an hour (I went back to sleep eventually, so I'm not sure how long it actually lasted). I had a hard time trying to get my dog to calm down, as the sound just kept going.
I live on Hawai'i, no factories or large industries anywhere near me, no large cities, very low population density. Occasionally military jets will fly over, and they can be loud, but the sound gets fainter as they move away. Like I said, this was continuous. I have no idea what it was.edit on 21-3-2011 by VariableConstant because: (no reason given)