ANCHORAGE, Alaska (AP) – An ash cloud from an Alaska volcano rose to 37,000 feet and stretched Monday more than 400 miles into interior Alaska.

Pavlof Volcano, one of Alaska’s most active volcanoes, erupted Sunday afternoon.

The Alaska Volcano Observatory says activity continued Monday.

Pavlof Volcano is 625 miles southwest of Anchorage on the Alaska Peninsula, the finger of land that sticks out from mainland Alaska toward the Aleutian Islands.

Lighting was detected over the volcano, and pressure-sensor data indicated sustained ash emissions.

Satellite date indicates the size of the ash cloud and its northeast flow.

Geologist Chris Waythomas of the U.S. Geological Survey says Pavlof can erupt for hours to days or erupt intermittently for longer periods of time.

The Federal Aviation Administration has issued a notice to pilots on the ash threat.