Alaska’s Bogoslof volcano erupted Sunday, initially sparking the most serious aviation alert.
The Alaska Volcano Observatory issued a code red aviation alert flight advisory but later downgraded it to orange.
However it said the volcano is still unpredictable and ‘additional explosions producing high-altitude volcanic clouds could occur at any time.’
It is located on Bogoslof Island, which is part of the Aleutian Islands and is underneath the flightpath of many transpacific flights to and from Asia.
An ash cloud measuring at least 35,000 feet spewed shortly after erupting the Observatory said.
The initial eruption lasted just one hours but volcanic activity continues to be monitored.
"Ash and aircraft do not mix, as volcanic ash is abrasive, melts at jet engine temperatures, and can cause engine failure," the United States Geological Survey says.
