Bogoslof Volcano in the Aleutian Islands erupted again on Sunday, sending a cloud of ash at least 35,000 feet into the air and prompting an aviation red alert.
The Alaska Volcano Observatory told the Associated Press the eruption began at 2:16 p.m. Sunday and lasted 55 minutes. After the eruption, the Aviation Color Code was raised to red, the highest level.
Ash can harm and stop jet engines. Ash from southwest Alaska volcanos is a threat airliners operating between North America and Asia when a cloud rises above 20,000 feet.
Satellite images and pilot reports indicate that the cloud from the eruption reached at least 35,000 feet, and possibly as high as 45,000 feet, the AVO said in its report. An observer on Unalaska Island reported seeing a large white-gray mushroom cloud form over Bogoslof, with ash fall out to the west.
https://weather.com/news/news/alaska-volcano-erupts-aviation-red-alert-ash-cloud