Could you be thinking of the "Grand Teton" or "Jackson Hole" meteor which was pictured on the cover of a magazine? In fact, I kept that cover for quite a few years (Scientific American?), then misplaced it.
That may be it, I'm pretty sure it was in Wyoming, so the location would be right.
As I recall, it was a very very close call for the earth. A very large meteor entered the atmosphere, travelled in the atmosphere over the west, then exited the atmosphere.
For some reason the altitude of 70 kilometers sticks in my mind as how close ot came to the earth's surface.
It occurred in the daytime and I think the proper term for daytime meteors is fireball. Or something like that.