FVXX21 KWBC 202000
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 2000 UTC 20 NOV 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-145         ECUADOR 1.47S 78.44W 
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BACKGROUND:    TUNGURAHUA ECUADOR (1502-08)
               SUMMIT HEIGHT 16480 FT (5023 M)
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SOURCES OF INFORMATION: GOES-8 VISIBLE AND MULTISPECTRAL IMAGERY.
UPPER-AIR DATA FROM THE GEOFISICO INSTITUTO.  AVIATION MODEL UPPER
AIR WIND DATA.
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ERUPTION DETAILS: CONTINUOUS STEAM AND ASH EMISSIONS WITH NEW
ERUPTION AROUND 20/1200 UTC
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DETAILS OF ASH: VISIBLE AND MULTISPECTRAL SATELLITE IMAGERY
INDICATED THAT THE ASH CLOUD FROM THE 1200 UTC ERUPTION HAS
PROGRESSED STEADILY TOWARD THE WEST SOUTHWEST. AT 20/1915 UTC THE
ASH CLOUD WAS CENTERED NEAR 2.2S/79.9W WITH A RADIUS OF ABOUT 20 KM
(11 NMI).   THE ASH TOPS WERE ESTIMATED TO BE BETWEEN FL300 AND
FL350. THIS ASH CLOUD WAS SLOWLY BECOMING MORE DIFFUSE. 
THUNDERSTORMS HAVE DEVELOPED OVER THE SUMMIT AND IN THE SURROUNDING
VICINITY PRECLUDING DETECTION OF ASH HOWEVER METAR REPORTS FROM SELT
INDICATED ASH OVER THE VOLCANO AS RECENTLY AS 1700 UTC.
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TRAJECTORY: TOWARDS THE WEST-SOUTHWEST AT 10-15 KT.
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REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH
ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING ASH
LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS  
http://www.ssd.noaa.gov/VAAC/washington.html
(all lower case except /VAAC/)
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OUTLOOK:  SEE SIGMETS AND VAFTAD.
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THE NEXT STATEMENT WILL BE ISSUED BY 20/0200 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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TURK/SAB/NOAA/NESDIS
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NNNN

"Attached Graphic Map Depicting Ash" 

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