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U.S. Geological Survey
Monday, August 7, 2017, 1:41 PM AKDT (Monday, August 7, 2017, 21:41 UTC)

53°55'38" N 168°2'4" W, Summit Elevation 492 ft (150 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED

The explosive eruption that began this morning at about 10:00 AM AKDT (18:00 UTC) continued through about 13:00 AKDT (21:00 UTC) as indicated in seismic, infrasound, satellite, and lightning data. Since that time, seismic and infrasound activity have declined, but are still above background. Low-level ash emissions may still be occurring, and could intensify again at any time.

Today's eruption is longer-lived than most of the events in the eruptive sequence that started in December 2016. Satellite images show that ash from the eruption is forming a continuous cloud, still attached at the volcano, that is being carried by strong winds south over Umnak Island and then out over the Pacific. The National Weather Service Alaska Aviation Weather Unit has issued a SIGMET warning message to aviation for the volcanic cloud up to an altitude of 34,000 ft asl.

The Aviation Color Code remains at RED and the Alert Level remains at WARNING.

Please see the National Weather Service Alaska Aviation Weather Unit web page for updated information on the volcanic cloud forecast. https://www.weather.gov/aawu/sigmets


Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

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Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

David Fee, Acting Coordinating Scientist, UAFGI
dfee1@alaska.edu (907) 322-4085

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
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Page modified: December 2, 2016 10:12
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