ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Sunday, May 28, 2017, 3:40 PM AKDT (Sunday, May 28, 2017, 23:40 UTC)

BOGOSLOF VOLCANO (VNUM #311300)
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 occurred at 14:16 AKDT (22:16 UTC) today lasted about 50 minutes and has ended. Since then, seismicity and infrasound as detected on neighboring islands is quiet, no lightning has been detected, and satellite images show no additional emission from the volcano.

Satellite images and pilot reports indicate that the cloud from today's eruption reached at least 35,000 ft, and possibly as high as 45,000 ft asl. An observer on Unalaska Island reported seeing a large white-gray mushroom cloud form over Bogoslof, with ash fall out to the west. Winds in the area are currently to the northwest.

Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Additional explosions producing high-altitude volcanic clouds could occur at any time. Low-level explosive activity that is below our ability to detect in our data sources may be occurring. These low-level explosions could pose a hazard in the immediate vicinity of the volcano.

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

The National Weather Service Alaska Aviation Weather Unit has issued a SIGMET for possible ash to 50,000 ft asl. Status of the ash cloud forecast can be found at their website: http://aawu.arh.noaa.gov/

The NWS has a Marine Weather Statement for trace or dusting of ash over coastal waters near the island: http://www.weather.gov/arh/

OTHER ALASKA VOLCANOES

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

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

FOLLOW AVO ON FACEBOOK: https://facebook.com/alaska.avo

FOLLOW AVO ON TWITTER: https://twitter.com/alaska.avo

CONTACT INFORMATION:

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

Jeff Freymueller, Coordinating Scientist, UAFGI
jfreymueller@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.

---