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AVO/USGS Volcanic Activity Notice

Volcano: Cleveland (CAVW #1101-24-)

Current Volcano Alert Level: WATCH

Current Aviation Color Code: ORANGE

Issued: Friday, February 8, 2008, 6:21 PM AKST (20080208/0321Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A2
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians Alaska
Volcanic Activity Summary: Two pilot reports have been received of an eruption at Cleveland volcano at approximately 0120 UTC (16:30 AST). The plume was reported to be at 20,000 ft. above sea level. AVO sees a diffuse ash cloud extending northwest from the volcano. Clouds prevent us seeing if the plume has detached from the volcano. A diffuse low-level plume was also seen earlier in satellite data and would be consistent with an increase in activity.

Thus, AVO is raising the Aviation color code to Orange and the Alert Level to Watch.

Recent Observations: [Volcanic cloud height] Pilot report of 20,000 ft. above sea level. A diffuse ash cloud is seen in satellite data extending northwest from the volcano, consistent with a height less than 20,000 ft. above sea level based on forecast winds.

Hazard Analysis: [Ash cloud] Pilots report the height of the plume to be at 20,000 ft. above sea level. Satellite data indicate a diffuse ash cloud extending northwest from the volcano and below 20,000 ft. above sea level based on forecast winds.

Remarks: AVO monitors Cleveland Volcano with satellite imagery as weather allows. The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.Please see http://www.avo.alaska.edu/activity/Cleveland.php for more information.

Contacts: Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497

Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

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.


AVO/USGS Volcanic Activity Notice

Volcano: Cleveland (CAVW #1101-24-)

Current Volcano Alert Level: WATCH

Current Aviation Color Code: ORANGE

Issued: Friday, February 8, 2008, 6:21 PM AKST (20080208/0321Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A2
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians Alaska
Volcanic Activity Summary: Two pilot reports have been received of an eruption at Cleveland volcano at approximately 0120 UTC (16:30 AST). The plume was reported to be at 20,000 ft. above sea level. AVO sees a diffuse ash cloud extending northwest from the volcano. Clouds prevent us seeing if the plume has detached from the volcano. A diffuse low-level plume was also seen earlier in satellite data and would be consistent with an increase in activity.

Thus, AVO is raising the Aviation color code to Orange and the Alert Level to Watch.

Recent Observations: [Volcanic cloud height] Pilot report of 20,000 ft. above sea level. A diffuse ash cloud is seen in satellite data extending northwest from the volcano, consistent with a height less than 20,000 ft. above sea level based on forecast winds.

Hazard Analysis: [Ash cloud] Pilots report the height of the plume to be at 20,000 ft. above sea level. Satellite data indicate a diffuse ash cloud extending northwest from the volcano and below 20,000 ft. above sea level based on forecast winds.

Remarks: AVO monitors Cleveland Volcano with satellite imagery as weather allows. The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.Please see http://www.avo.alaska.edu/activity/Cleveland.php for more information.

Contacts: Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497

Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

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.
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: avo.alaska.edu/activity/avoreport.php
Page modified: May 16, 2014 09:40
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