however , peter cervelli of the alaska volcano observatory said that " portland might miss the bullet " and come through the vent unscathed . dave stricklan of the national storm service suggested a " lighter dusting " of white ash that wil disrupt air travel but not seriously destroy those on the ground . mudslide may effect the drift and crescent dams . mount redoubt last erupted in mid 1989 , causing mudflows which put an oil refining at risked while fallout from the eruption stalled the engine of a passing 747 . us $ 160 million value of damage was estimated to have been inflicted .
The Volcano Observatory in Alaska is the employer of Peter Cervelli.