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Mount Redoubt Volcano Explosion

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URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE ANCHORAGE AK

240 AM AKDT MON MAR 23 2009

 

ASHFALL ADVISORY NOW IN EFFECT

 

REDOUBT VOLCANO AT 60.5N 152.7W HAS ERUPTED SEVERAL TIMES DURING

THE NIGHT. LIGHT ASHFALL HAS ALREADY BEEN REPORTED AT SKWENTNA.

LIGHT ASHFALL IS POSSIBLE THROUGHOUT THE SUSITNA VALLEY THIS

MORNING.

 

SUSITNA VALLEY-

INCLUDING THE CITIES OF...TALKEETNA...WILLOW...CANTWELL

 

Seismic activity at Mount Redoubt increased at about 1:05 AKDT Sunday afternoon (March 15, 2009) and approximately 4 hours of continuous volcanic tremor ensued. The onset of the tremor was associated with a small explosion that produced a plume of gas and ash that rose to about 15,000 feet above sea level and deposited a trace amount of ash over the summit-crater floor and down the south flank of the volcano to about 3,000 feet.

 

Here is a view of the summit crater of Redoubt Volcano on March 15, 2009, about three hours after a small ash eruption through the ice cap. Continuing vigorous emission of water vapor, volcanic gas is occurring from the 1990 lava dome (dark area at lower right) and the new vent that is obscured by the plume. Ash and other tephra fall from the event is the dark material blanketing the south side of the crater. In the foreground is the dark face of the 1990 lava dome.

 

Volcanic ash consists of tiny jagged pieces of rock and glass. Ash is hard, abrasive, mildly corrosive, conducts electricity when wet, and does not dissolve in water. Ash is spread over broad areas by wind. Falling ash can turn daylight into complete darkness. Accompanied by rain and lightning, the gritty ash can lead to power outages, prevent communications, and disorient people.

 

post-3675-1237809243_thumbjpg

 

AVO's 24/7 Recording on the Status of Alaska's Volcanoes: (907)786-7478

 

http://www.avo.alaska.edu/volcanoes/volcac...;eruptionid=610

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