[Davea]

There was a 12 kiloton explosion in the atmosphere a little while ago.....http://dsc.discovery.com/news/briefs/20020916/meteor.html

[Centurion2000]

This was a rather ominous passage from that website link above.

Every year there are about 30 meteors that explode in the atmosphere with power greater than a kiloton — the equivalent of a thousands tons of TNT — Worden said.