FVXX21 KWBC 131920  
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1920 UTC 13 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-243        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...U.S. NUMERICAL MODEL WIND FORECASTS.
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ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM.
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DETAILS OF ASH: GOES8 IMAGERY THOUGH 1845 UTC SHOWS A FAINT NARROW
PLUME EXTENDING FROM THE VOLCANO TO THE POINT 1.6S 78.8E.  THIS
PLUME IS APPROXIMATELY 20 NMI LONG AND 5 NMI WIDE AND IS MOVING JUST
SOUTH OF WEST AT ABOUT 10 KNOTS.  UPPER AIR DATA WOULD PLACE THIS
PLUME AT ABOUT FL200.
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TRAJECTORY: UPPER AIR WIND FORECASTS FROM NUMERICAL MODELS SUGGEST
ANY ASH AT FL200 WOULD MOVE JUST SOUTH OF WEST AT 5-10 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 14/0130 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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