One bright white and two bright green lights that lit up everything like daytime, except it was night.

I have 3 accounts of strange lights that I have seen and would like to know your oppinion on these sightings. Before I continue, I would like to say that I am a believer in the UFO phenominum, but I guess when you actually see something, it leaves you wondering if what you saw was a possible sighting. The 1st happened back in 1987 in the Upper Peninsula of Michigan in the town of Bessmer.It was about 2:30 in the morning, it was sometime in the middle of summer. I was driving home on US 2; the weather seemed to take kind of an abropt change maybe partially cloudy evening to a fairly hard rain. Well what happened next is what I have ?'s about. At the very 1st instant I thought I was experiencing lightning, you know how it lights everything up. But after the 1st flash that seemed to last alittle to long, just after it a green colored flash lit everything up and lasted a couple seconds. This sequence of white then green happened 4 or 5 times at about 1 minute apart from each other until I got up to the source of where it was coming from. Off to my left side maybe 150 to 200 yards away, ahuge circular white light appeared partially blocked in the trees. Then in the same interval previously described, two green lights, half the size, and on opposite sides of where the white light was appeared. As I tryed to find a place to safely stop and turn the car around to get a better look, the sequence happened one more time then it was gone and I never saw it again. Could this have been an electrical storm? There was no lightning bolts coming from the sky. It took me maybe 10 minutes to get home afterwards, and as quickly as the rain started it had ended with just a partially overcast sky
Date is approximate.  Please see other accounts for the dates indicated.  PD