FVXX21 KWBC 251810
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1810 UTC 25 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-293         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...0600 UTC AVIATION MODEL WIND FORECAST
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ERUPTION DETAILS: EMISSIONS OF ASH AND STEAM
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DETAILS OF ASH: AT 1715 UTC SATELLITE IMAGERY SHOWS THREE AREAS OF
ASH.  
   TWO AREAS OF ASH ARE PRIMARILY NORTHEAST OF THE VOLCANO. ONE AREA
OF ASH EXTENDS FROM 1.37S 78.36W TO 1.26S 78.28W AND IS 17 KM (9
NMI) LONG AND 2 KM (1 NMI) WIDE AND HAS AN ESTIMATED HEIGHT OF
FL320.  ANOTHER PLUME EXTENDS FROM THE SUMMIT TOWARD THE NORTHEAST
REACHING THE POINT 1.38S 78.40W.  THIS PLUME IS 18 KM (10 NMI) LONG
AND 2 KM (1 NMI) WIDE AND ALSO HAS AN ESTIMATED HEIGHT OF FL320. 
    THE THIRD AREA OF ASH IS MOSTLY NORTHWEST OF THE VOLCANO.  THIS
AREA EXTENDS FROM 1.49S 78.47W TO 1.46S 78.53W AND IS 4 KM (2 NMI)
WIDE.  IT IS DIFFICULT TO ASSIGN A HEIGHT TO THIS ASH BUT WE SUSPECT
IT IS AT OR BELOW FL300.
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TRAJECTORY: ASH AT ABOUT FL320 IS MOVING TO THE NORTHEAST AT 10 TO
15 KNOTS AND ASH BELOW FL300 IS MOVING TO THE WEST AT LESS THAN 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 AND VAFTAD.
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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 26/0000 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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STREETT
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NNNN
"Attached Graphic Map Depicting Ash" 

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