Highest aviation alert level issued after Alaskan volcano erupts

[Leroy N. Soetoro]

http://www.cnn.com/2017/05/29/us/alaska-bogoslof-volcano-eruption/

(CNN)A volcanic eruption Sunday prompted the temporary raising of the
highest aviation alert, the Alaska Volcano Observatory (AVO) said Sunday.

The event, which took place on Alaska's Bogoslof Island, part of the
Aleutian island chain, caused the issuance of a code "red" aviation alert,
which was subsequently downgraded to "orange."

The cloud from the eruption reached at least 35,000 ft., and possibly as
high as 45,000 ft., the Observatory said.

"We actually went to color code red this afternoon because of numerous
lightning detections and increased seismic signals," Jeffrey Freymueller
of the Geophysical Institute at the University of Alaska, Fairbanks tells
CNN.

"Lightning in the Aleutians is mostly due to volcanic plumes, as the
meteorological conditions for lightning are not common," Freymueller said.

"The combination of lightning and seismic data allowed us to go to red
within about half an hour of the start of the eruption."

The eruption lasted for about 50 minutes, the AVO said.

Flight path concern
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," according to the United
States Geological Survey.

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.

The Federal Aviation Administration (FAA) last week said that flights were
being rerouted around a similar ash cloud when the volcano previously
erupted, according to CNN partner CBC.

'Heightened state of unrest'
An image taken by AVO scientists around 14 minutes after the start of the
eruption, from nearby Unalaska Island, showed a large white-gray mushroom
cloud form over the site. Ash fallout was occurring to the west of the
site, according to AVO.

Bogoslof volcano remains at a heightened state of unrest and in an
unpredictable condition," according to a report issued by the Observatory,
which added that "additional explosions producing high-altitude volcanic
clouds could occur at any time."

It warns that continuing low-level activity could "pose a hazard in the
immediate vicinity of the volcano."

Previous volcanic activity earlier in 2017 "significantly changed the
shape and coastline of the island" and the land mass tripled in size
between early 2015 and January of this year.

There have been eight documented eruption events at Bogoslof, the most
recent one in 1992. Previous eruption events have lasted weeks to months,
according to the AVO. This current eruption sequence started in December,
2016.


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