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AVO/USGS Volcanic Activity Notice

Volcano: Redoubt (CAVW #1103-03-)

Current Volcano Alert Level: WARNING

Current Aviation Color Code: RED

Issued: Monday, March 23, 2009, 8:14 PM AKDT (20090324/0414Z)
Source: Alaska Volcano Observatory
Notice Number: 2009/A13
Location: N 60 deg 29 min W 152 deg 44 min
Elevation: 10197 ft (3108 m)
Area: Cook Inlet-South Central Alaska

Volcanic Activity Summary: Another phase of vigorous ash eruption at Redoubt Volcano began at 7:41 pm (AKDT). AVO remains at Aviation Color Code RED and Alert Level WARNING.

The top of the ash cloud is estimated to be at least 50,000 ft above sea level based on NWS radar. Winds in the vicinity of the volcano vary with altitude and are expected to carry the ash cloud primarily to the west and north. Seismicity has declined somewhat since the start of the event but remains elevated.

AVO remains staffed 24 hours per day will issue further information as it becomes available.

For up-to-date Ashfall Advisories and wind trajectories, please refer to the National Weather Service website: http://pafc.arh.noaa.gov/volcano.php

Recent Observations:
[Volcanic cloud height] NWS radar indicates the volcanic cloud has reached 50,000 ft.
[Other volcanic cloud information]

Hazard Analysis:
[Ash fall] Ash fall can be expected in the vicinity and downwind of the volcano. Winds in the vicinity of the volcano vary with altitude and are expected to carry the ash cloud primarily to the west and north.
[Pyroclastic flow] Pyroclastic flows have observed in the AVO web camera descending the north flank of the volcano and extending along the east side of the Drift Glacier piedmont lobe. Pyroclastic flows may also be affecting other drainages on the volcano.
[Mud flow] Mudflows are occurring in the Drift River drainage. These fast moving flows of volcanic debris and water may reach Cook Inlet within several hours. Other drainages on the volcano may also experience mudflows.

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.
(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:(20090324/0414Z)
(3) Volcano:Redoubt (CAVW# 1103-03-)
(4) Current Color Code:RED
(5) Previous Color Code:red
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2009/A13
(8) Volcano Location:N 60 deg 29 min W 152 deg 44 min
(9) Area:Cook Inlet-South Central Alaska
(10) Summit Elevation:10197 ft (3108 m)
(11) Volcanic Activity Summary:Another phase of vigorous ash eruption at Redoubt Volcano began at 7:41 pm (AKDT). AVO remains at Aviation Color Code RED and Alert Level WARNING.

The top of the ash cloud is estimated to be at least 50,000 ft above sea level based on NWS radar. Winds in the vicinity of the volcano vary with altitude and are expected to carry the ash cloud primarily to the west and north. Seismicity has declined somewhat since the start of the event but remains elevated.

AVO remains staffed 24 hours per day will issue further information as it becomes available.

For up-to-date Ashfall Advisories and wind trajectories, please refer to the National Weather Service website: http://pafc.arh.noaa.gov/volcano.php
(12) Volcanic cloud height:NWS radar indicates the volcanic cloud has reached 50,000 ft.
(13) Other volcanic cloud information:
(14) 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
(15) Next Notice:A new VONA will be issued if conditions change significantly or alert levels are modified. While a VONA is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu