(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170627/1152Z)
(3) Volcano:	Bogoslof (VNUM #311300)
(4) Current Color Code:	RED
(5) Previous Color Code:	ORANGE
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:
(8) Volcano Location:	N 53 deg 55 min W 168 deg 2 min
(9) Area:	Aleutians
(10) Summit Elevation:	492 ft (150 m)
(11) Volcanic Activity Summary:	A significant explosive eruption began at Bogoslof volcano at 11:17 UTC on June 27 (03:17 AKDT) as indicated in seismic and lighting data and is continuing. Although at this time there have been no satellite images or pilot reports received confirming eruptive activity, these monitoring data strongly suggest that significant ash emissions have occurred. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING. AVO is evaluating all data sources and will update this report as more information becomes available.
(12) Volcanic cloud height:	None detected yet. NWS eruption SIGMET issued to 30,000 ft asl.
(13) Other volcanic cloud information:	Wind direction to the northeast
(14) Remarks:	The National Weather Service Alaska Aviation Weather Unit has issued an eruption SIGMET warning for aviation up to 30,000 ft above sea level. This may be revised as new information becomes available. Please see the NWS AAWU at http://www.weather.gov/aawu/sigmets for updated information on aviation warning messages.
(15) Contacts:	Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497 Jeff Freymueller, Coordinating Scientist, UAF jfreymueller@alaska.edu (907) 322-4085
(16) Next Notice:

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AVO/USGS Volcanic Activity Notice

Volcano: Bogoslof (VNUM #311300)

Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: WATCH

Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Issued: Tuesday, June 27, 2017, 3:52 AM AKDT
Source: Alaska Volcano Observatory
Notice Number:
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: A significant explosive eruption began at Bogoslof volcano at 11:17 UTC on June 27 (03:17 AKDT) as indicated in seismic and lighting data and is continuing. Although at this time there have been no satellite images or pilot reports received confirming eruptive activity, these monitoring data strongly suggest that significant ash emissions have occurred. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING.

AVO is evaluating all data sources and will update this report as more information becomes available.


Recent Observations:
[Volcanic cloud height] None detected yet. NWS eruption SIGMET issued to 30,000 ft asl.
[Other volcanic cloud information] Wind direction to the northeast
[Lava flow/dome] N/A
[Lava flow] N/A

Remarks: The National Weather Service Alaska Aviation Weather Unit has issued an eruption SIGMET warning for aviation up to 30,000 ft above sea level. This may be revised as new information becomes available. Please see the NWS AAWU at http://www.weather.gov/aawu/sigmets for updated information on aviation warning messages.

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

Jeff Freymueller, Coordinating Scientist, UAF
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.

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