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ARCHIVED REPORT
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REDOUBT VOLCANO



05:05: Onset of explosive event; seismic signal of moderate amplitude begins on RED and NCT and increases 45 seconds later. Seismicity returns to pre-event levels within 20 minutes. LDS shows 2 ground strikes near Redoubt; DROT crew see lightning and hear thunder. Plume to 9 km; ash to NE; moderate flood. Level of concern color code upgraded to ORANGE.



????: Pilot report of plume to 30,000 feet.



06:30: Ashfall begins at Beluga power plant; heavy ashfall 30 minutes later. All but one of the gas turbines are turned off to prevent damage. Ashfall stops at 09:30.



08:00: Ashfall begins at Willow, continues to about 09:45.



09:15: Water in Rust Slough rises between two and three feet suddenlt and subsides within 13 minutes. Second Crest occurs at 10:15.



09:30: Ashfall begins at Kashwitna.



PM: Aerial reconnaisance shows that the dome was only partially destroyed.

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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