FVXX20 KWBC 181100
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VOLCANIC ASH ADVISORY STATEMENT 
ISSUED 1100 UTC 18 DEC 1999 BY THE WASHINGTON VAAC
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GUAGUA PICHINCHA 99-161         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: THE ASH FROM THE EARLIER ERUPTION IS NO LONGER
DISCERNIBLE IN SATELLITE IMAGERY THRU 1015 UTC. THE LATEST SURFACE
REPORT FROM QUITO DOES NOT MENTION VOLCANIC ASH OVER THE STATION.    
     
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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 18/1700 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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KARST/NOAA/NESDIS/SAB
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