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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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REDOUBT VOLCANO



13:00: Increase in summit seismic activity during last 3 hours, new Redoubt update upgrading level of concern color code to ORANGE.



17:23: Onset of explosive event; lasts 8 minutes at SPU.



17:28: Report from DROF, vertical eruption cloud, drifting to NE.



17:30: Pilot report of plume to 30,000 ft and drifting E towards Kenai.



17:31: Seismicity at SPU station returns to background.



17:33: 2 lightning strikes recorded on LDS to the NW, which is direction of 18k forecasted winds. Experimental flood flow sensor 1 triggered.



17:40: AVO COSPEC crew observes cloud-to-cloud lightning.



18:00: Total of 4 strikes recorded on LDS, all to NW. AVO-FBXs reports plume to 30,000 ft from slow scan observations.



18:08: Leading edge of ash plume reaches W coast of Kenai Peninsula just S of Nikiski.



18:50: Pilot report of plume to 33,000 feet.



19:00: Call to Kenai; dark cloud overhead, but no ashfall to ground yet.



PM: Light ashfall in Kenai.

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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