FVXX21 KWBC 311200 
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1200 UTC 31 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-319         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 INFRARED AND MULTISPECTRAL IMAGERY.
GEOPHYSICAL INSTITUTE IN QUITO. 0000 UTC AVIATION MODEL.
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ERUPTION DETAILS: INTERMITTENT ASH AND STEAM EMISSIONS.
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DETAILS OF ASH: SATELLITE IMAGERY THROUGH 31/1115 UTC SHOWS A THIN
WELL DEFINED PLUME STRETCHING TO THE SOUTHWEST AWAY FROM THE SUMMIT.
THE PLUME IS 45 KM IN LENGTH AND 11 KM WIDE AND EXTENDS TO THE POINT
1.74S 78.8W.  BASED ON A 12 HOUR FORECAST FROM THE 31/0000 UTC
AVIATION NUMERICAL MODEL THE PLUME IS BELIEVED TO BE AT FL200.
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TRAJECTORY: ASH AT FL200 WILL MOVE TOWARD THE SOUTHWEST AT 5 KNOTS.
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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.
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EFFECTIVE JANUARY 3 2000 AT 0000 UTC... ALL REFERENCES TO LATITUDE
AND LONGITUDE IN VOLCANIC ASH ADVISORY STATEMENTS WILL BE IN DEGREES
AND MINUTES OF A DEGREE.  EXAMPLE: 16.70N 62.20W  WILL BE 1642N6212W
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THE NEXT STATEMENT WILL BE ISSUED BY 31/1800 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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WALTER/SAB/NOAA/NESDIS
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NNNN
"Attached Graphic Map Depicting Ash" 

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