Cloud chamber effect: The expansion of the air in the negative phase of the blast wave from the explosion results in a lowering of the temperature, so that condensation of water vapor present in the air occurs and a cloud forms. The cloud is soon dispelled when the pressure returns to normal and the air warms up again.

It's not a cloud, I think that's the shock wave going through the air compressing it. What you see is called a shadowgraph.

Never mind, he's right.

What you just said had nothing to do with lolcats. who the hell are you and what have you done with the real La Loco?

yay cats woooooo

Thundercats! KABOOM!

thank you for the clarification

Yeah I've always wished Hollywood would realize the visceral power of a real explosion vs the slow, fat, orange ball of burning gasoline they so adore.

watch The Hurt Locker