(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170601/0451Z)
(3) Volcano:	Bogoslof (VNUM #311300)
(4) Current Color Code:	ORANGE
(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:	An short duration explosive event occurred at Bogoslof volcano at 2:42 UTC on June 1 (6:42 AKDT on May 31) and produced a small volcanic ash cloud that was observed in satellite data. Winds are transporting the cloud towards the northwest at an estimated altitude of 23,000 ft asl. The duration of the event was less than 10 minutes, and seismicity returned to low levels following the explosion. Due to the brevity of the event, the Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH.
(12) Volcanic cloud height:	23,000 ft asl
(13) Other volcanic cloud information:	NWS eruption SIGMET issued.
(14) Remarks:	The National Weather Service Alaska Aviation Weather Unit has issued an eruption SIGMET warning for aviation up to 23,000 ft above sea level. 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 Jessica Larsen, Acting Coordinating Scientist, UAF jflarsen@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: WATCH

Current Aviation Color Code: ORANGE

Issued: Wednesday, May 31, 2017, 8:51 PM 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: An short duration explosive event occurred at Bogoslof volcano at 2:42 UTC on June 1 (6:42 AKDT on May 31) and produced a small volcanic ash cloud that was observed in satellite data. Winds are transporting the cloud towards the northwest at an estimated altitude of 23,000 ft asl. The duration of the event was less than 10 minutes, and seismicity returned to low levels following the explosion.

Due to the brevity of the event, the Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH.

Recent Observations:
[Volcanic cloud height] 23,000 ft asl
[Other volcanic cloud information] NWS eruption SIGMET issued.
[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 23,000 ft above sea level. 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

Jessica Larsen, Acting Coordinating Scientist, UAF
jflarsen@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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