FVXX21 KWBC 311930 
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1930 UTC 31 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-321         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. GEOPHYSICAL INSTITUTE IN QUITO. 1200 UTC AVIATION MODEL.
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ERUPTION DETAILS: INTERMITTENT ASH AND STEAM EMISSIONS.
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DETAILS OF ASH: VISIBLE SATELLITE IMAGERY THROUGH 1845 UTC SHOWS A
NARROW PLUME STRETCHING TO THE SOUTHWEST. THE PLUME EXTENDING TO THE
POINT 1.8S 79.1W IS 84KM (45NMI) IN LENGTH AND 15KM (8NMI) WIDE. 
BASED ON THE 31/1200 UTC AVIATION NUMERICAL MODEL THE PLUME IS
ESTIMATED TO BE AT FL250.
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TRAJECTORY: ASH AT FL250/300 WILL MOVE TOWARD THE WEST AND SOUTHWEST
AT 15 TO 20 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 01/0130 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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BROWN/SAB/NOAA/NESDIS
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NNNN
"Attached Graphic Map Depicting Ash" 

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