Very infrequently occuring semi-natural disaster in which a tornado descends upon an active volcano and hurls the lava about (lavabomb) in a haphazardly manner, thereby exacerbating the situation.
Did you see that tornado that hit Mt. St. Helens while it was erupting? It was definitely a M3 torcano on the Marsh scale.
by Tha Wizz June 10, 2009