(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20170610/1303Z)
(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:	An explosive eruption is detected in multiple data streams. Small explosions were first observed on infrasound stations located on nearby Islands beginning at 11:18 UTC (3:18 AKDT). Activity transitioned to continuous seismic tremor at about 12:16 UTC and is ongoing. An eruption cloud has been observed in satellite data and lightning has been detected. AVO is raising the Aviation Color Code to RED and the Volcano Alert Level remains at WARNING. More information will be released as it becomes available.
(12) Volcanic cloud height:	30,000 ft estimate at 12:20 UTC
(13) Other volcanic cloud information:	Winds are generally northward
(14) Remarks:	The National Weather Service has issued a SIGMET for this eruption to 30,000 ft asl. Please check their information at http://www.weather.gov/aawu/ as this is an evolving situation and cloud height may change.
(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:

---

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: Saturday, June 10, 2017, 5:03 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: An explosive eruption is detected in multiple data streams. Small explosions were first observed on infrasound stations located on nearby Islands beginning at 11:18 UTC (3:18 AKDT). Activity transitioned to continuous seismic tremor at about 12:16 UTC and is ongoing. An eruption cloud has been observed in satellite data and lightning has been detected. AVO is raising the Aviation Color Code to RED and the Volcano Alert Level remains at WARNING. More information will be released as it becomes available.

Recent Observations:
[Volcanic cloud height] 30,000 ft estimate at 12:20 UTC
[Other volcanic cloud information] Winds are generally northward
[Lava flow/dome] NA
[Lava flow] N/A

Remarks: The National Weather Service has issued a SIGMET for this eruption to 30,000 ft asl. Please check their information at http://www.weather.gov/aawu/ as this is an evolving situation and cloud height may change.

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.

---