Are there any natural phenomena on Earth that involve supersonic speeds? Are there any natural phenomena on Earth that involves supersonic speeds, other than volcanic tephra and meteoroids?
Edit: 
By natural I mean not man made like airplanes, rockets, missiles, bullet, etc.
Thanks for the answers. What I first had in mind was a macroscopic body relative to its immediate surrounding. If we're going down to atoms level, I think most of the atoms and all electrons wiggle at supersonic speeds (one could even ask if there any elementary particles that travel at subsonic speeds). Sorry I wasn't clear the first time.
And look at MSalters comment as well
 A: Neutrinos passing through you. Photons from the sun. The tangential velocity of many points on the Earth. The speed of beta particles.
A: Thunder is basically the sonic boom formed by a lightning strike and lightning is as fast as light but the charged air particles move magnitudes slower, closer to but faster than the speed of sound. So when you hear the thunder of a thunderstorm, what you are really hearing is a sonic boom.
A: I am not sure if you mean something like this, since it is man-made but it does not include engines:
The tip of a whip can move faster than the speed of sound, this is why it creates this loud noise.
see http://en.wikipedia.org/wiki/Whip for some further information.
A: Some dinosaurs may have been able to move their tails in such a way that the tip of the tail achieved supersonic speed (whip-like effect - was mentioned here, but in the case of dinosaurs it is not "man-made":-) ) (https://www.jstor.org/stable/2401127?seq=1#page_scan_tab_contents)
EDIT(12/13/2016): There is also a possibility that earthquakes can produce cracks traveling with supersonic speed (http://web.mit.edu/mbuehler/www/research/supersonic.htm)
A: Tsunami waves are very fast. Speed of tsunami wave in deep ocean may get higher than the speed of sound in the air:
http://wcatwc.arh.noaa.gov/?page=tsunami_science
