USA Today reports that according to the U.S. Geological Survey, the Pavlov Volcano, "about 600 miles southwest of Anchorage, erupted at 4:18 p.m. local time. The agency says the eruption also led to tremors on the ground. ... The USGS has raised the volcano alert level to "Warning" and the aviation warning to 'Red.'" Television station KTUU of Anchorage has a few photos of the emerging ash plume, which has so far risen to about 20,000 feet (hence that aviation warning).