FVXX20 KWBC 121435
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1435 UTC 12 SEPTEMBER 1999 BY THE WASHINGTON VAAC 
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GUAGUA PICHINCHA 99-009 ECUADOR 0.17S 78.60W 
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BACKGROUND:    GUAGUA PICHINCHA (1502-02)
               SUMMIT HEIGHT    15,695FT (4784 M)  
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SOURCES OF INFORMATION:  SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH
OFFICE...INSTITUTO GEOFISICO ESCUELA POLITECNICA NACIONAL...00 UTC
AVIATION MODEL RUN

ERUPTION DETAILS: ERUPTION AT APPROXIMATELY 12/1127 UTC.            
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DETAILS OF ASH CLOUD: A SIGMET FROM GUAYAGUIL SUGGESTED AN ERUPTION
OF GUAGUA PICHINCHA.  THE GEOPHYSICAL INSTITUTE IN QUITO CONFIRMED
THAT AN ERUPTION OCCURRED AT 1127 UTC.  THE ERUPTION WAS OF SHORT
DURATION LASTING ONLY 10 - 15 MINUTES AND SENT A COLUMN OF ASH TO
APPROXIMATELY FL200.  THE INSTITUTE FURTHER REPORTED THAT SUCH
PHREATIC EXPLOSIONS HAVE BEEN OCCURRING FOR THE LAST COUPLE OF
WEEKS.  PREVIOUS ERUPTIONS HAVE RESULTED IN ASHFALL 80 TO 90 KM
DOWNWIND.   NO ASH COULD BE DISCERNED IN SATELLITE DATA THROUGH 1215
UTC DUE TO MID AND HIGH LEVEL CLOUDS. THE VOLCANO WAS QUIET AT 1400
UTC.
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TRAJECTORY: TOWARD THE NORTHWEST AT 20 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  
www.ssd.noaa.gov/VAAC/washington.html
(all lower case except /VAAC/)
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OUTLOOK:  SEE SIGMETS.
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THE NEXT MESSAGE WILL BE ISSUED AT 12/2030 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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