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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20141116/1713Z)
(3) Volcano: Pavlof (VNUM #312030)
(4) Current Color Code: ORANGE
(5) Previous Color Code: RED
(6) Source: Alaska Volcano Observatory
(7) Notice Number: 2014/A17
(8) Volcano Location: N 55 deg 25 min W 161 deg 53 min
(9) Area: Alaska Peninsula
(10) Summit Elevation: 8261 ft (2518 m)
(11) Volcanic Activity Summary: The intensity of the eruption of Pavlof Volcano has greatly diminished, and the Aviation Color Code is being decreased to ORANGE and the Volcano Alert Level to WATCH.

Seismic tremor abruptly decreased around 7 pm AKST yesterday (04:00 UTC on 16 November) and has remained at very low levels since. Satellite observations confirmed a large decrease in ash emissions, and at present show no evidence of an ash plume at the volcano. Discrete seismic events continue to be observed at Pavlof, and minor ash emissions may be occurring that are not detected in satellite. Pilot and/or ground observer reports may provide additional information once the sun comes up. Pauses of days to weeks are common during eruptive episodes at Pavlof and increased activity could occur with little warning.

Aviation users should refer to the National Weather Service for updated SIGMETs on the ash cloud hazard (http://www.weather.gov/aawu/sigmets). No reports of ash fallout on nearby communities have been received and we encourage observers to contact AVO should it occur (https://www.avo.alaska.edu/ashfall/ashreport.php).
(12) Volcanic cloud height: None detected at the volcano at present. Minor ash emissions may occur but will likely be lower than 12,000 ft above sea level.
(13) Other volcanic cloud information: See SIGMETs for information on dispersed cloud from the period of heightened activity.
(14) Remarks:
(15) Contacts: John Paskievitch, Acting Scientist-in-Charge, USGS
jpaskie@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 322-4085
(16) Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu

AVO/USGS Volcanic Activity Notice

Volcano: Pavlof (VNUM #312030)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: WARNING

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: RED

Issued: Sunday, November 16, 2014, 8:13 AM AKST
Source: Alaska Volcano Observatory
Notice Number: 2014/A17
Location: N 55 deg 25 min W 161 deg 53 min
Elevation: 8261 ft (2518 m)
Area: Alaska Peninsula

Volcanic Activity Summary: The intensity of the eruption of Pavlof Volcano has greatly diminished, and the Aviation Color Code is being decreased to ORANGE and the Volcano Alert Level to WATCH.

Seismic tremor abruptly decreased around 7 pm AKST yesterday (04:00 UTC on 16 November) and has remained at very low levels since. Satellite observations confirmed a large decrease in ash emissions, and at present show no evidence of an ash plume at the volcano. Discrete seismic events continue to be observed at Pavlof, and minor ash emissions may be occurring that are not detected in satellite. Pilot and/or ground observer reports may provide additional information once the sun comes up. Pauses of days to weeks are common during eruptive episodes at Pavlof and increased activity could occur with little warning.

Aviation users should refer to the National Weather Service for updated SIGMETs on the ash cloud hazard (http://www.weather.gov/aawu/sigmets). No reports of ash fallout on nearby communities have been received and we encourage observers to contact AVO should it occur (https://www.avo.alaska.edu/ashfall/ashreport.php).


Recent Observations:
[Volcanic cloud height] None detected at the volcano at present. Minor ash emissions may occur but will likely be lower than 12,000 ft above sea level.
[Other volcanic cloud information] See SIGMETs for information on dispersed cloud from the period of heightened activity.

Contacts: John Paskievitch, Acting Scientist-in-Charge, USGS
jpaskie@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 322-4085

Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu


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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URL: www.avo.alaska.edu/activity/avoreport.php
Page modified: February 17, 2017 10:11
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