We had quite the thunderstorm move through Central/Eastern Massachusetts today (4-Aug) and I had enough warning to set up a camera to see if anything interesting could be captured.

It, of course, completely missed the lightning strikes (not enough karma), but the atmospheric effect at the 1 minute mark, just before the deluge and hail arrived, was pretty awesome.

Captured at 1 frame every 2 seconds, conformed to 30 fps.  Camera was located in Maynard, MA and facing southwest.