FVXX21 KWBC 212300 VOLCANIC ASH ADVISORY ISSUED 2300 UTC 21 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-853 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE. GUAYAQUIL MWO. . ERUPTION DETAILS: EXPLOSION WITH HEAVY ASH EMISSION AROUND 21/2220 UTC. . DETAILS OF ASH: THE GEOPHYSICAL INSTITUTE HAS JUST REPORTED THAT A RATHER IMPRESSIVE EXPLOSION HAS OCCURRED AT TUNGURAHUA. A DENSE ASH CLOUD WAS OBSERVED TO BE LEAVING THE SUMMIT AND REACHING A ESTIMATED HEIGHT OF FL350. THE REPORT WAS AS OF 21/2220 UTC. SATELLITE IMAGERY THORUGH 21/2215 UTC REVEALED NO ASH OR SUGGESTIONS OF ANY ERUPTION. THE NEXT SEVERAL IMAGES SHOULD REVEAL THE NATURE OF THIS EVENT. . TRAJECTORY: ASH FROM THE SUMMIT TO FL250 SHOULD MOVE TO THE WEST AT 10 TO 20 KNOTS WHILE ASH FROM FL250 TO FL350 SHOULD MOVE SOUTHWEST AT 20 TO 30 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 22/0500 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORIES 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/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN