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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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REDOUBT VOLCANO



11:00: Level of concern color code downgraded to ORANGE. (Note: Redoubt Volcano Chronology in the AVO Monthly Report lists the color code change at 15:00 AST)



11:15+: Dark cloud at least 10 miles wide and 20 miles long passes over Anchorage, between 11:15-11:45.



11:55: Ashfall, including large flakes reported from oil platforms.



12:20: Water level in Rust Slough rises slightly at Drift River oil facility but no flooding occurs. Reconnaissance of upper Drift River reveals little or no water flow in channel, question of blockage of the Drift River.



12:50: Light ashfall and dark cloud overhead reported in Wasilla.



14:30: Very light ashfall continues at Anchorage, all but stopped.



PM: FAA report of ashfall W and N of Anchorage (perhaps first event(?)) and also over Kenai Peninsula (perhaps second event (?)). Heaviest low level ash reported W and N of Anchorage. Plume maps show high level winds to east and low level winds to north and northeast.

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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