Alaska volcano spews thick ash cloud, triggering aviation warning January 20, 2020 at 05:28AM

Shishaldin Volcano, one of the most active in Alaska, kicked out a plume of ash that satellite imagery detected as high as 28,000 feet (8,535 m) above sea level, according to the Alaska Volcano Observatory, the joint federal-state-university office that tracks the state's many volcanoes.