FVXX20 KWBC 171615
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VOLCANIC ASH ADVISORY STATEMENT 
ISSUED 1615 UTC 17 DEC 1999 BY THE WASHINGTON VAAC
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GUAGUA PICHINCHA 99-157         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...QUITO
SURFACE OBSERVATION... GOES-8 VISIBLE INFRARED AND MULTISPECTRAL
IMAGERY. U.S NUMERICAL MODEL WIND FORECAST.
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ERUPTION DETAILS: THE GEOPHYSICAL INSTITUTE REPORTED A SERIES OF
ERUPTIONS BEGINNING AROUND 1300 UTC WITH AN EXPLOSIVE ERUPTION AT
1410 UTC.
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DETAILS OF ASH CLOUD: THE LATEST GOES-8 VISIBLE SATELLITE IMAGERY AT
1515 UTC SHOWS AN EXTENSIVE PLUME OF ASH. LOW LEVEL ASH SPREAD TO
THE NORTHWEST 45KM (24NMI) AND TO THE NORTH 25KM (14NMI) FROM THE
SUMMIT. HIGHER LEVEL ASH EXTENDED 94KM (51NMI) TO THE SOUTHEAST.THE
HIGHER LEVEL ASH IS ESTIMATED TO FL450.
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TRAJECTORY: UPPER AIR PATTERN AND NUMERICAL GUIDANCE SUGGEST ASH AT
THE LOWER LEVELS MOVING TOWARD THE NORTH AND NORTHWEST AT 12 KNOTS.
ASH AT FL450 IS MOVING TOWARD THE NORTHEAST AT 26 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 17/2230 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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BROWN
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NNNN"Attached Graphic Map Depicting Ash" 

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