mid 1970's UFO over Decatur,Alabama

The summer of 1973 or 1974, my mother,brother and I were sitting outside on a hot summer evening; I was 15 or 16 years old. The sky was clear...
1 by one, bright neon colored round lights in different colors appeared overhead until they formed a HUGE circle formation; it stayed that way until a cloud covered it and it dissapeared,leaving the star filled sky.
we all oohed and ahhed; the radio announced within a half hour that they recieved over 250 calls about this. They said that the NASA center in Huntsville,Alabama stated it was weather baloons; years later, I saw the same type of 'event' in the movie CLOSE ENCOUNTERS.
I have not seen this event posted any place else! It was beautiful,and I'll always remember that moment when I saw my one and only UFO.
Date is approximate.  PD