FVXX21 KWBC 112245 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2230 UTC 11 JUNE 1999 BY THE WASHINGTON VAAC CORRECTED FOR ISSUANCE TIME . GUAGUA PICHINCHA 99-006 ECUADOR 0.17N 78.60W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: GOES 8 VISIBLE AND MULTISPECTRAL IMAGERY. VOLCANO OBSERVATORY IN QUITO ECUADOR. GUAYAQUIL SIGMET. AVN MODEL . ERUPTION DETAILS: ERUPTION AROUND 11/1812 UTC. . 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. . 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. . 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/) . OUTLOOK: PLEASE REFER TO SIGMETS AND VAFTAD. . THE NEXT MESSAGE WILL BE ISSUED AT 12/0430 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN