FVXX22 KWBC 092123
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 2123 UTC 09 NOV 1999 BY THE WASHINGTON VAAC
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SOUFRIERE HILLS   99-257  WEST INDIES  16.7N 62.2W 
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BACKGROUND:      SOUFRIERE HILLS   MONTSERRAT  (1600-05)
                 SUMMIT HEIGHT  3000 FT  (915 M)
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SOURCES OF INFORMATION:  MONTSERRAT VOLCANO OBSERVATORY...GOES-8
VISIBLE INFRARED AND MULTISPECTRAL IMAGERY...12 UTC AVIATION MODEL
UPPER-AIR SOUNDING DATA.
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ERUPTION DETAILS: INITIAL ERUPTION OCCURRED AT 09/2112
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DETAILS OF ASH CLOUD: THE MONTSERRAT VOLCANO OBSERVATORY HAS
INDICATED AN EXPLOSION AT THE SOUFRIERE HILLS VOLCANO. ASH IS
ESTIMATED TO BE REACHING FL200. HOWEVER THEY REPORTED THAT THE
ERUPTION IS STILL OCCURRING AND THAT THE ASH MAY GO TO A HIGHER
ALTITUDE. SATELLITE IMAGERY WILL SOON BE ABLE TO CONFIRM THE EXACT
NATURE OF THE ERUPTION.
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TRAJECTORY: ASH FROM THE SUMMIT TO FL100 SHOULD MOVE TO THE WEST AT
ABOUT 10 KNOTS. HOWEVER THE ASH FROM FL100 TO FL200 SHOULD BE MUCH
MORE VARIABLE WITH A GENERAL MOTION TO THE EAST AT UP TO 5 KNOTS.
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THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY
A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS
www.ssd.noaa.gov/VAAC/messages.html
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OUTLOOK:  SEE SIGMETS.
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THIS NEXT MESSAGE WILL BE ISSUED BY 10/0330 UTC. IF THERE IS AN ASH
CLOUD EVIDENT IN SATELLITE IMAGERY THEN A NEW VAAS ALONG WITH A
GRAPHIC WILL ISSUED MUCH SOONER.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON
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NNNN