green fireball w/long tail came straight down, when object reached horizon, was big flash like a huge explosion lit the whole sky for 1.5sec-flash was green also.

it was an early morning 2:30am, spring '93, i was looking south and  a perfectly round green ball came streaking down from the sky, when it reached the point where the horizon was, a big green flash lit the whole sky, like an explosion. when i saw the ball i told my friend to look, he didn't see the ball but he saw the green flash, and said-"what was that?" it was very green-like neon green.