PP rumbling noise

Now that I'm listening for it, I can hear the rumblings off and on even now.  I thought it was a large truck or something but it sometimes comes one after another even when I don't hear any traffic.

I'm a few miles west of PP and I can still feel it.

Is that Web site saying that they'll do this until 11:59 PM today and start back up at 6:00 AM?  :(
 
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