FVXX21 KWBC 210700 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0700 UTC 21 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-594 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...GEOPHYSICAL INSTITUTE...0000 UTC AVIATION MODEL FORECAST DATA. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 21/0615 UTC DOES NOT INDICATE ANY ASH. THERE IS A FAIRLY EXTENSIVE DECK OF CLOUDINESS OVER AND ADJACENT TO THE SUMMIT WHICH IS MAKING IT DIFFICULT TO ACCURATELY ASSESS THE LEVEL OF ACTIVITY. THE LAST REPORT OF ASH WAS AT 21/2110 UTC WHEN THE GEOPHYSICAL INSTITUTE REPORTED ASH TO FL280 OVER THE VOLCANO. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL280 SHOULD MOVE TO THE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 21/1300 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