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ARCHIVED REPORT
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ERUPTION AT MOUNT CLEVELAND, CENTRAL ALEUTIANS



The National Weather Service received two pilot reports between 5:00 PM and 6:00 PM Alaska Daylight Time of an ash cloud rising up to 35,000 feet ASL from Mount Cleveland in the Central Aleutian Islands. NWS satellite imagery shows a small patch of ash drifting NE of the volcano at about 16,000 ft ASL over the Bering Sea. The ash cloud appears to have been a single burst rather than a sustained eruption. The vicinity of the volcano has no inhabitants. A vigorous steam plume was reported on 4/29/94 by pilots. AVO observers flying over the volcano on 5/10/94 also reported a vigorous steam plume; no ash was observed in the plume or on the flanks of the volcano on that date.



Mount Cleveland forms the western half of Chuginidak Island located about 40 km west of the southwest tip of Umnak Island. It is a 1730-m (5675 feet)-high, symmetrical stratocone which has been frequently active throughout this century. Recorded eruptions occurred most recently in 1987 and included ash and steam emission, minor lava flows, and a short interval of lava fountaining from the summit crater. An especially explosive eruption produced a 10-km-high plume detected on satellite imagery on August 28, 1987. The volcano has a fairly active fumarolic field.



The Alaska Volcano Observatory has no monitoring equipment on this remote volcano. AVO will continue to monitor the situation principally through analysis of satellite imagery and compilation of pilot reports.

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: May 27, 2014 10:23
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