FVXX21 KWBC 211730 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1730 UTC 21 MAR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-341 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVN MODEL. . ERUPTION DETAILS: NEARLY CONTINUOUS VENTING OF GASES WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 1645 UTC SHOWS EXTENSIVE LOW AND MID LEVEL CLOUDINESS IN THE VINCITY OF THE VOLCANO MAKING ANY DETECTION OF ASH DIFFICULT. . TRAJECTORY: ANY ASH BELOW FL300 WILL MOVE TOWARDS THE WEST OR WEST SOUTHWEST AT 20 KTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 21/2330 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. . KARST . NNNN