Premise: However, Peter Cervelli of the Alaska Volcano Observatory said that "Anchorage might dodge the bullet" and come through the eruption unscathed. Dave Stricklan of the National Weather Service predicted a "light dusting" of fine ash that would disrupt air travel but not seriously affect people on the ground. Mudflows may affect the Drift and Crescent Rivers. Mount Redoubt last erupted in late 1989, causing mudflows which put an oil refinery at risk while ash from the eruption stalled the engine of a passing airliner. US$160 million worth of damage was estimated to have been caused.
Hypothesis: Mount Redoubt did not erupt in 1989.