FVXX21 KWBC 121500 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1500 UTC 12 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-433 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY... AVIATION MODEL WINDS ALOFT FORECAST MODEL. . ERUPTION DETAILS: ASH AND STEAM EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 1415 UTC SHOWS CLOUDY CONDITIONS IN THE VICINITY OF THE VOLCANO. THE CLOUD COVER MAKES DETECTION OF ANY ASH DIFFICULT. THE VOLCANO REMAINS UNSTABLE. THE LAST REPORT FROM THE GEOPHYSICAL INSTITUTE HAD ASH TO FL250. . TRAJECTORY: ASH BETWEEN THE SUMMIT AND FL250 WOULD MOVE TOWARD THE WEST AT 15 TO 20 KTS. OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 12/2100 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. . BROWN . NNNN