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AVO/USGS Volcanic Activity Notice

Volcano: Cleveland (CAVW #1101-24-)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: YELLOW

Issued: Monday, August 11, 2008, 1:52 PM AKDT (20080811/2152Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A26
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians Alaska

Volcanic Activity Summary: Thermal signatures as recorded from satellite indicate that Cleveland is still actively erupting. The eruption seems to be predominately lava flows down its flanks. Based on Cleveland currently being in eruption, the Aviation Color Code for Cleveland is increased from Yellow to Orange. The Alert Level remains at Watch. No ash plumes have been observed in satellite images since July 29.

Recent Observations:
[Volcanic cloud height] No ash plume detected.
[Other volcanic cloud information] No ash plume seen. None expected outside immedate area of Cleveland.

Hazard Analysis:
[Lava flow/dome] Rockfalls and avalanches of hot debris from the cooling lava flows on the flanks of Cleveland can occur with little or no warning. These events can produce small, localized ash plumes. Larger rockfalls can produce block and ash flows or avalanches that are hazardous to anything in their path.

Remarks: Please see http://www.avo.alaska.edu/activity/Cleveland.php for more information.

Contacts: Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov, (907)786-7497

Jon Dehn, Acting Coordinating Scientist, UAFGI
dehn@gi.alaska.edu (907) 474-6499

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

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.


(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:(20080811/2152Z)
(3) Volcano:Cleveland (CAVW# 1101-24-)
(4) Current Color Code:ORANGE
(5) Previous Color Code:yellow
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2008/A26
(8) Volcano Location:N 52 deg 49 min W 169 deg 56 min
(9) Area:Aleutians Alaska
(10) Summit Elevation:5676 ft (1730 m)
(11) Volcanic Activity Summary:Thermal signatures as recorded from satellite indicate that Cleveland is still actively erupting. The eruption seems to be predominately lava flows down its flanks. Based on Cleveland currently being in eruption, the Aviation Color Code for Cleveland is increased from Yellow to Orange. The Alert Level remains at Watch. No ash plumes have been observed in satellite images since July 29.
(12) Volcanic cloud height:No ash plume detected.
(13) Other volcanic cloud information:No ash plume seen. None expected outside immedate area of Cleveland.
(14) Remarks:Please see http://www.avo.alaska.edu/activity/Cleveland.php for more information.
(15) Contacts:Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov, (907)786-7497

Jon Dehn, Acting Coordinating Scientist, UAFGI
dehn@gi.alaska.edu (907) 474-6499

(16) Next Notice:A new VONA will be issued if conditions change significantly or alert levels are modified. While a VONA 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].
URL: avo.alaska.edu/activity/avoreport.php
Page modified: October 23, 2013 13:13
Contact Information: AVO Web Team

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