FVXX21 KWBC 180820 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0820 UTC 18 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-456 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...NATIONAL WEATHER SERVICE MODEL WINDS FORECAST . ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: NO ASH IS DETECTED IN SATELLITE IMAGERY THROUGH 0745 UTC. THE GEOPHYSICAL INSTITUTE HOWEVER HAS BEEN REPORTING CONTINUED INSTABILITY AND THE THREAT OF ADDITIONAL ERUPTIONS AT ANY TIME. THE MOST RECENT EMISSIONS OF ASH THAT WERE REPORTED HAVE BEEN NEAR SUMMIT IN NATURE WITH HEIGHTS ESTIMATED AS HIGH AS FL220. . TRAJECTORY: ANY NEW ASH THAT MAY EXIST FROM THE SUMMIT TO FL220 WOULD MOVE WEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 18/1430 UTC. . 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 http://www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN