FVXX21 KWBC 112230
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0100 UTC 11 JUNE 1999 BY THE WASHINGTON VAAC 
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GUAGUA PICHINCHA 99-006   ECUADOR 0.17N 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: GOES 8 VISIBLE AND MULTISPECTRAL IMAGERY.
VOLCANO OBSERVATORY IN QUITO ECUADOR. GUAYAQUIL SIGMET. AVN MODEL
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ERUPTION DETAILS: ERUPTION AROUND 11/1812 UTC.
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DETAILS OF ASH CLOUD: THE CANCELLATION OF A SIGMET OUT OF GUAYAQUIL
AT 2047Z WAS THE FIRST INFORMATION RECEIVED OF AN ERUPTION OF GUAGUA
PICHINCHA.  INFORMATION PROVIDED FROM THE VOLCANO OBSERVATORY IN
QUITO CONFIRMED THAT A MODERATELY LARGE ERUPTION OCCURRED AT 1812
UTC.  THE TOP OF THE ASH CLOUD WAS ESTIMATED BY OBSERVERS TO BE
APPROXIMATELY FL320 WITH THE ERUPTING COLUMN BEING VISIBLE ABOVE THE
CLOUD DECK.  THE ASH CLOUD DISPERSED QUICKLY.  THE ERUPTION WAS NOT
DETECTED IN SATELLITE IMAGERY GOING BACK TO THE TIME OF THE EVENT AND
VISIBLE AND MULTISPECTRAL IMAGERY THROUGH 2045 UTC DID NOT REVEAL ANY
ASH.  THE OBSERVATORY INDICATED THAT THIS WAS THE LARGEST ERUPTION OF
GUAGUA PICHINCHA IN TWO MONTHS.
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TRAJECTORY: ANY ASH WOULD MOVE GENERALLY TOWARD THE WEST BETWEEN 15
AND 20 KNOTS BETWEEN FL250 AND FL320...TOWARD THE WEST SOUTHWEST
BETWEEN 15 AND 20 KNOTS BETWEEN FL140 AND FL250 AND TOWARD THE WEST
BETWEEN 15 AND 20 KNOTS BELOW FL140...BASED ON AVN MODEL DATA.     
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THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY
A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS
www.ssd.noaa.gov/VAAC/messages.html
(all lower case except /VAAC/)
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OUTLOOK: PLEASE REFER TO SIGMETS AND VAFTAD.
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THE NEXT MESSAGE WILL BE ISSUED AT 12/0430 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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