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VOLCANO ACTIVITY NOTIFICATIONS

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Report Text
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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20170217/1948Z)
(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 18:55 UTC (09:55 AKST) today. Pulses of seismicity are continuing. Preliminary satellite data show an ash cloud, and lightning continues to be detected. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano.

Winds are from the south and will generally carry the ash cloud north over the Bering Sea.

Activity is ongoing and additional explosive events may occur. We will provide more information about the ash cloud as it becomes available.
(12) Volcanic cloud height: SIGMET to 25,000 ft asl
(13) Other volcanic cloud information: Cloud moving generally north
(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 winds are to the north.
(15) Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
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: Friday, February 17, 2017, 10:48 AM AKST
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 18:55 UTC (09:55 AKST) today. Pulses of seismicity are continuing. Preliminary satellite data show an ash cloud, and lightning continues to be detected. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano.

Winds are from the south and will generally carry the ash cloud north over the Bering Sea.

Activity is ongoing and additional explosive events may occur. We will provide more information about the ash cloud as it becomes available.


Recent Observations:
[Volcanic cloud height] SIGMET to 25,000 ft asl
[Other volcanic cloud information] Cloud moving generally north

Hazard Analysis:
[Ashfall] None expected on communities at this time, winds are to the north.

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 winds are to the north.

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

Jeff Freymueller, Coordinating Scientist, UAFGI
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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