© Lynda Lybeck Robinson, APThis photo taken Dec. 21, 2016 and provided by Lynda Lybeck Robinson shows the Bogoslof Volcano erupting in the Aleutian Islands, Alaska. A volcano in the Aleutian Islands erupted Friday.
Bogoslof Volcano erupted Friday morning, and the observatory says it generated an ash cloud that may be as high as 25,000 feet.
Volcanic ash above 20,000 feet is a threat to airliners flying between Asia and North America.
The volcano 850 miles southwest of Anchorage has erupted more than 25 times since mid-December and could continue periodic eruptions for months. It also erupted Thursday.
After Friday's event, the Aviation Color Code was raised from orange to red, the highest level. The observatory says the cloud could reach 30,000 feet.
The National Weather Service issues alerts to traffic controllers after significant eruptions.
Source: Associated Press
Comment: The Aleutian Islands volcanoes are part of the Pacific Ring of Fire, an area subject to frequent earthquakes and volcanic eruptions. The Bogoslof volcano has seen quite a bit activity recently:
January 18: Alaska's Bogoslof Volcano erupts again, sends ash cloud to 31,000 feet
January 12: Photographs show how recent eruptions at Alaska's Bogoslof volcano have changed island
January 5: Bogoslof Volcano in the Aleutians back at Red Alert
December 29: Increased seismic activity at Alaska's Bogoslof volcano
December 27: Bogoslof volcano alert raised to red by the Alaska Volcano Observatory
December 23: For second day running, Bogoslof volcano eruption sparks aviation alert in Alaska
December 21: Bogoslof volcano in Alaska erupts briefly, spews ash cloud 34,000 feet