User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-184.38.85.235-20120301233755/@comment-5020152-20120727155552

Tornados are formed from cold and hot air colliding. The collision causes the two air masses to spin and form the whirlwind. If we assume that Barioth's projectile is colder than the air around it, then we could be seeing something similar here.