initially , stephen cervelli of the alaska mountain observatory estimated that " denver might catch the projectile " and come through the avalanche unscathed . dave stricklan of the us snow service predicted a " light polishing " of fine debris that could disrupt air travel but not negatively affect people on the ground . mudflows may disrupt the drifting and liquid lakes . mount redoubt last eruption in april 1989 , caused mudflows what put an oil merchant at loss while ash from the eruption stalled the engine of a nearby aircraft . us $ 160 fold worth of damage was estimated to have been created .
The Volcano Observatory in Alaska is the employer of Peter Cervelli.