FVXX20 KWBC 172245
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VOLCANIC ASH ADVISORY STATEMENT 
ISSUED 2245 UTC 17 DEC 1999 BY THE WASHINGTON VAAC
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GUAGUA PICHINCHA 99-159         ECUADOR 0.17S 78.60W 
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BACKGROUND:    GUAGUA PICHINCHA ECUADOR (1502-02)
               SUMMIT HEIGHT    15695 FT (4784 M)  
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SOURCES OF INFORMATION: THE GEOPHYSICAL INSTITUTE IN ECUADOR. GOES-8
VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. U.S. NUMERICAL MODEL
WIND FORECAST.
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ERUPTION DETAILS: THE GEOPHYSICAL INSTITUTE REPORTED AN EXPLOSIVE
ERUPTION AT 2004 UTC.
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DETAILS OF ASH CLOUD: GOES-8 IMAGERY THROUGH 2215 UTC SHOWS AN
ELONGATED ASH CLOUD APPROX 211 KM (114 NMI) WIDE AND 39 KM (21 NMI)
LONG FROM POINT .17N 78.73W TO POINT .56S 76.98W. THIS ASH IS
ESTIMATED TO BE AT FL300 AT THE NORTH POINT TO FL400 AT THE SOUTH
END. THE ASH IS EXPANDING AND MOVING AT A GENERAL SPEED OF 15 KNOTS
TO THE NORTHEAST. DUE TO RAPID SCAN OPERATIONS GOES-8 WILL LOSE
SOUTHERN HEMISPHERE IMAGERY BETWEEN 17/2226 UTC AND 18/0326 UTC. 
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TRAJECTORY: UPPER AIR PATTERN AND NUMERICAL GUIDANCE SUGGEST ASH AT
FL300 TO MOVE NORTH AT 10 KNOTS AND ASH AT FL400 TO MOVE EAST 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 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 AT 18/0500 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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HUGHES/NOAA/NESDIS/SAB
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NNNN"Attached Graphic Map Depicting Ash" 

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