FVXX21 KWBC 152255
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 2255 UTC 15 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-252       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 INFRARED AND MULTISPECTRAL
IMAGERY...1800 AVIATION MODEL SOUNDING DATA...GEOPHYSICAL INSTITUTE
REPORTS AND UPPER-AIR DATA.
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ERUPTION DETAILS: NEARLY CONTINUOUS STEAM EMISSIONS WITH OCCASIONAL
PULSES OF ASH...
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DETAILS OF ASH: AN ASH AND STEAM PLUME WITH POOR DEFINITION CAN BE
DETECTED COMING OFF THE SUMMIT AND PUSHING TO THE SOUTHWEST. THE ASH
AND STEAM IS BECOMING EMBEDDED WITHIN CLOUDINESS ASSOCIATED WITH THE
DAILY SHOWER AND THUNDERSTORM ACTIVITY WHICH IS MAKING IT VERY
DIFFICULT TO ANALYZE. ASH AND STEAM ARE ESTIMATED TO BE REACHING
FL240. CAUTION IS STRONGLY ADVISED.
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AS OF 15/2315 UTC THE ASH AND STEAM IS SEEN EXTENDING AT LEAST 97 KM
(52 NMI) FROM THWE SUMMIT TO A POINT AT 1.96S 79.16W. THE PLUME IS
47 KM (25 NMI) WIDE.
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TRAJECTORY: SOUTHWEST AT 10 TO 15 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 16/0600 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON
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NNNN
"Attached Graphic Map Depicting Ash" 

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