Saw very bright green light in western sky.Caught site of a bright green flat disk shaped light in the western sky. It was difficult to tell if it was close or far away. When I first saw it, it was just hovering. It then moved slowly to the north, then quickly disappeared into the clouds. I continued to watch to see if it came out again from the clouds, but it didn't. Saw 2 helicopters and several large aircraft about 15 minutes after in same direction, but could not tell type of planes due to darkness.((NUFORC Note: Witness elects to remain totally anonymous. PD))