Yesterday, around 5:40 AM, we had what sounded like an approaching thunderstorm. It was unique in that it sounded like one continuous roll of thunder, with maybe a few small breaks. I know there were several distinct rolls, but they overlapped so much it was a bit tough to tell. Here's what makes this worth reporting: 1) I never saw any lightning flares. It sounded distant, so I figured it never quite got to our area, BUT 2) It managed to reset the clock on the microwave, start the D* receiver in the basement (happens on some pikes, but not sure why only this one), and that's it. No other clocks, fans, nothing else 3) It didn't show up on radar. I check online when I got up @ 6, and weather.com has about an hour or so of the most recent radar, and it was clear. Any ideas what that was? If it was cloud-to-cloud, it would have had to have been high enough to escape radar, and yet somehow, close enough to effect at least some of my electronics.