FVXX20 KWBC 030715
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0715 UTC 03 DEC 1999 BY THE WASHINGTON VAAC
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GUAGUA PICHINCHA 99-137         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: LARGE ERUPTION AT 03/0300 UTC.
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DETAILS OF ASH CLOUD: GOES-8 INFRARED IMAGERY THROUGH 0645 UTC SHOWS
A DETACHED AND EXPANDING ASH CLOUD MOVING SOUTHWEST FROM THE SUMMIT.
THIS ASH CLOUD IS 108 KM (58 NMI) LONG AND ALIGNED NORTHWEST TO
SOUTHEAST FROM .08N 79.37W TO .63S 78.71W. IT IS APPROX 41 KM (22
NMI) WIDE. THE HEIGHT IS ESTIMATED TO BE AT FL360 ON THE NORTHWEST
SIDE TO FL250 ON THE SOUTHEAST PART. THIS IS BASED ON NUMERICAL
MODEL WINDS AND INITIAL WIND ANALYSIS FROM THE GEOPHYSICAL
INSTITUTE. 
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TRAJECTORY: UPPER AIR PATTERNS BASED ON NUMERICAL GUIDANCE SUGGEST
ASH AT FL360 TO MOVE WEST NORTHWEST AT 5 TO 10 KNOTS WHILE ASH AT
FL250 WOULD MOVE 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 03/1330 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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