Chain Lightning

I was driving home from a location shoot through this storm the other evening and just after sunset the rain eased up enough for me to decide to pull off the highway, jump out of the truck, and snap a few shots. I managed to get a few decent shots and then all at once  just as if it had been synchronized in some way,  it got dark, the lightning diminished greatly in frequency signalling the end of the storm, and the mosquitoes discovered me. I called it quits and hit the highway for home. This is actually the very last frame I shot before I left.