#21239
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WhiteKnight
Survivalist
rprepper

Evidently more in Canada and Europe. But I know Texans have heard it, etc. Enough people called into news outlets in several Canadian towns to ask what the heck it was, hence the media exposure. Seems to occur at random and if I had to select an explanation, I’d say it had to do with increased solar activity and changes in the magnetosphere. Just look up the news clips.