premise: The eruption happened at around 1:30 PM local time, the United States Geological Survey reported. The volcano had erupted four times on Friday, billowing ash up to 51,000 feet up into the air. These are the latest in a series of eruptions from Mount Redoubt, which started on March 22. The volcano had not erupted since a four-month period in 1989-90. The Alaska Volcano Observatory set its alert level at red, the highest possible level, meaning that an eruption is imminent, and that it would send a "significant emission of volcanic ash into the atmosphere."
hypothesis: Mount Redoubt is located in Alaska.