FVXX20 KWBC 172050
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VOLCANIC ASH ADVISORY STATEMENT 
ISSUED 2050 UTC 17 DEC 1999 BY THE WASHINGTON VAAC
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GUAGUA PICHINCHA 99-158         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 2015 UTC SHOWS A VERY
THICK CLOUD OF ASH AT THE SUMMIT AND MOVING NORTHEAST AND EASTWARD.
THIS ASH IS ESTIMATED TO BE AT FL400. THE ASH CLOUD IS BOUND BY
POINTS .09S 78.58W -- .25S 48.4W -- .23S 78.62W.
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TRAJECTORY: UPPER AIR PATTERN AND NUMERICAL GUIDANCE SUGGEST ASH AT
FL300 TO MOVE NORTH AT 10 TO 15 KNOTS AND ASH AT FL400 TO MOVE EAST
AT 5 TO 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 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 18/0300 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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HUGHES/BROWN/RENKEVENS/CLARK
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NNNN"Attached Graphic Map Depicting Ash" 

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