Alaskan volcano erupts again, leading to aviation warning

(CNN)An Alaskan volcano that has erupted several times since last year spewed an ash cloud up to 30,000 feet, leading to an aviation warning.

The Bogoslof volcano erupted Saturday, sending ash over the Aleutians Islands, the Alaska Volcano Observatory (AVO) said.
It “remains at a heightened state of unrest and in an unpredictable condition, and additional explosions producing high-altitude volcanic clouds could occur at any time,” the observatory said.
    The volcano sits under the flight path of many flights from Asia to North America and its ash cloud could adversely affect aircraft.
    “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.
    CNN Map
    The aviation color code remains at red.
    Bogoslof’s current eruption sequence started in December, according to the observatory. Its previous eruption events have lasted weeks, sometimes months.
    In May, an eruption prompted a similar temporary aviation alert but was subsequently downgraded to “orange.”
    Aircraft are often instructed to fly around or over ash clouds, although in some circumstances air traffic has been grounded due to the hazards from airborne ash. In 2010 the eruption of the Eyjafjallajokull volcano in Iceland caused the cancellation of flights around Europe for six days.

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