FVXX20 KWBC 030420
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0420 UTC 03 DEC 1999 BY THE WASHINGTON VAAC
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GUAGUA PICHINCHA 99-136         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 INFRARED AND MULTISPECTRAL IMAGERY...U.S. NUMERICAL MODEL
WIND FORECAST.
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ERUPTION DETAILS: VERY LARGE ERUPTION AT 03/0300 UTC.
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DETAILS OF ASH CLOUD: GOES-8 IMAGERY THROUGH 0345 UTC SHOWS A COLD
ASH CLOUD THAT HAS SPLIT INTO TWO DIRECTIONS. THE ASH IS MOVING WEST
AND SOUTH AT THIS TIME. THE WESTWARD ASH IS EXTENDED 28 KM (15 NMI)
TO THE WEST OF THE SUMMIT TO .16S 78.85W AND MOVING 15 TO 20 KNOTS.
THIS ASH IS ESTIMATED TO BE AT FL400. ---- THE SOUTH MOVING ASH IS
EXTENDED 17 KM (9 NMI) TO THE SOUTH OF THE SUMMIT TO .32S 78.65W AND
MOVING 10 TO 15 KNOTS. THIS ASH IS ESTIMATED TO BE AT FL250. HEIGHT
ESTIMATES WERE BASED ON WIND MEASUREMENTS TAKEN AT GUAGUA AND
INFRARED TEMPERATURE MEASUREMENTS. 
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TRAJECTORY: UPPER AIR PATTERNS BASED ON NUMERICAL GUIDANCE SUGGEST
ANY ASH AT FL400 TO MOVE WEST AT 15 TO 20 KNOTS AND ASH AT FL250 TO
MOVE SOUTH SOUTHWEST 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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HUGHES/NOAA/NESDIS/SAB
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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 03/1030 UTC UNLESS NEW
INFORMATION IS RECEIVED.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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NNNN"Attached Graphic Map Depicting Ash" 

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