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VOLCANO ACTIVITY NOTIFICATIONS

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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20170613/0340Z)
(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: The eruption of Bogoslof that began 01:47 UTC June 13 (17:47 AKDT June 12) with a 9-minute duration explosion has resumed starting at 02:57 UTC June 13 (18:57 AKDT June 12) based on seismic and infrasound data.

The ash cloud produced during the initial 9-minute event has been observed in satellite data through 02:20 UTC June 13 (18:20 AKDT June 12) and is estimated to be at about 25,000 feet above sea level drifting SE toward Unalaska Island. Ash emissions from this new activity have yet to be observed but they are likely occurring with winds to the SE. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano. Activity is ongoing and additional explosive events may occur.
(12) Volcanic cloud height: 25,000 ft asl estimated by satellite data.
(13) Other volcanic cloud information: Cloud moving towards SE
(14) Remarks: The SIGMET warning message for aviation, issued by the National Weather Service Alaska Aviation Weather Unit currently is in effect up to 25,000 ft above sea level. Status of the ash cloud forecast can be found at their website at http://aawu.arh.noaa.gov/

No ash fallout is expected in populated areas, as the ash cloud is expected to be transported out over the ocean. The National Weather Service in has issued a Special Weather Statement for the possibility of a trace amount of ash fallout in Unalaska/Dutch Harbor tonight. See http://www.weather.gov/afc/ for details.
(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:

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: Monday, June 12, 2017, 7:40 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: The eruption of Bogoslof that began 01:47 UTC June 13 (17:47 AKDT June 12) with a 9-minute duration explosion has resumed starting at 02:57 UTC June 13 (18:57 AKDT June 12) based on seismic and infrasound data.

The ash cloud produced during the initial 9-minute event has been observed in satellite data through 02:20 UTC June 13 (18:20 AKDT June 12) and is estimated to be at about 25,000 feet above sea level drifting SE toward Unalaska Island. Ash emissions from this new activity have yet to be observed but they are likely occurring with winds to the SE. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano. Activity is ongoing and additional explosive events may occur.


Recent Observations:
[Volcanic cloud height] 25,000 ft asl estimated by satellite data.
[Other volcanic cloud information] Cloud moving towards SE

Remarks: The SIGMET warning message for aviation, issued by the National Weather Service Alaska Aviation Weather Unit currently is in effect up to 25,000 ft above sea level. Status of the ash cloud forecast can be found at their website at http://aawu.arh.noaa.gov/

No ash fallout is expected in populated areas, as the ash cloud is expected to be transported out over the ocean. The National Weather Service in has issued a Special Weather Statement for the possibility of a trace amount of ash fallout in Unalaska/Dutch Harbor tonight. See http://www.weather.gov/afc/ for details.

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.
VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].
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Page modified: February 17, 2017 10:11
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