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Report Text
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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20170127/1831Z)
(3) Volcano: Bogoslof (VNUM #311300)
(4) Current Color Code: RED
(5) Previous Color Code: ORANGE
(6) Source: Alaska Volcano Observatory
(7) Notice Number: 2017/A27
(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: Lightning and seismicity increase indicate a significant explosive eruption began at 08:24 AKST (17:24 UTC). We are thus raising the color code to RED and alert level to WARNING.

Satellite data suggests volcanic cloud may be as high as 25,000 ft asl. The current eruption SIGMET issued by the National Weather Service is up to 30,000 ft asl, but may be updated. We are actively evaluating data sources and will provide an update as necessary.


(12) Volcanic cloud height: 25,000 ft asl from satellite data
(13) Other volcanic cloud information: SIGMET currently to 30,000 ft asl
(14) Remarks: Please refer to the NWS Alaska Aviation Weather unit for updated information on the volcanic cloud forecast.
(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: Friday, January 27, 2017, 9:31 AM AKST
Source: Alaska Volcano Observatory
Notice Number: 2017/A27
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: Lightning and seismicity increase indicate a significant explosive eruption began at 08:24 AKST (17:24 UTC). We are thus raising the color code to RED and alert level to WARNING.

Satellite data suggests volcanic cloud may be as high as 25,000 ft asl. The current eruption SIGMET issued by the National Weather Service is up to 30,000 ft asl, but may be updated. We are actively evaluating data sources and will provide an update as necessary.




Recent Observations:
[Volcanic cloud height] 25,000 ft asl from satellite data
[Other volcanic cloud information] SIGMET currently to 30,000 ft asl

Remarks: Please refer to the NWS Alaska Aviation Weather unit for updated information on the volcanic cloud forecast.

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.
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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