FVXX21 KWBC 211500
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1500 UTC 21 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-275        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.
AVIATION UPPER AIR SOUNDING FORECAST.
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ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM.
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DETAILS OF ASH: CURRENT SATELLITE IMAGERY THROUGH 1415 UTC SHOWS A
LOW LEVEL ASH PLUME MOVING SOUTHWEST.  THIS PLUME EXTENDS
APPROXIMATELY 91KM (50 NMI) TO A POINT 2.1N 79.0W AND IS 9 KM (5NMI)
WIDE AT THE WIDEST POINT.  THERE MAY BE ADDITIONAL ASH IN THE
VICINITY OF THE VOLCANO WHICH IS PARTIALLY OBSCURED BY CLOUDS. BASED
ON MODEL SOUNDING INFORMATION THIS PLUME IS ESTIMATED TO BE BETWEEN
FL100 AND FL190.  
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TRAJECTORY: ASH BETWEEN FL100 AND FL190 WOULD MOVE SW AT 10-15 KTS.
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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 21/2100 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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"Attached Graphic Map Depicting Ash" 

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