FVXX21 KWBC 221200 VOLCANIC ASH ADVISORY ISSUED 1200 UTC 22 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-856 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: SATELLITE IMAGERY THROUGH 22/1145 UTC DOES NOT SHOW ANY ASH PLUME FROM THE LARGE ERUPTION AT 21/2200 UTC. EXTENSIVE CLOUDINESS OVER THE SUMMIT MAKES DETECTION OF ASH DIFFICULT. THE MOST RECENT REPORT OF ASH OVER THE VOLCANO WAS AT 21/2248 UTC TO FL350 FROM THE GEOPHYSICAL INSTITUTE. . TRAJECTORY: ACCORDING TO THE AVIATION MODEL ANY ASH FROM THE SUMMIT TO FL250 WILL MOVE TO THE NORTHWEST AT 10 TO 15 KTS WHILE ASH FROM FL250 TO FL350 WILL MOVE TO THE WEST AT 15 TO 20 KTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 22/1800 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. . KARST . NNNN