A volcanic eruption in Alaska sent ash 20,000 feet up in the air and prompted flight warnings, according to authorities. 
Alaska Volcano Observatory said the Pavlof Volcano, which is about 600 miles southwest of Anchorage, erupted on Sunday afternoon. The agency says the eruption also led to tremors on the ground. 
A volcano alert warning remained in effect early Monday morning, and the aviation warning color code remains red, its highest level. 
Ash was reportedly moving north after the eruption, according to the volcano observatory. 
The USGS says that during a previous eruption in 2013, ash plumes rose 27,000 feet. Other eruptions have generated ash plumes as high as 49,000 feet. 
The community closest to the volcano is Cold Bay, which is about 37 miles southwest of it.

Source: QNA