FVXX21 KWBC 301830 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1830 UTC 30 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-507 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE ... INFRARED AND MULTISPECTRAL IMAGERY. GEOPHYSICAL INSTITUTE. SIX HOUR FORECAST FROM THE 30/1200 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 30/1745 UTC SHOWS LOW AND MID LEVEL CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT. THE MOST RECENT REPORT FROM GEOPHYSICAL INSTITUTE INDICATES ASH OVER THE VOLCANO MOVING WEST. NO HEIGHT ASSIGNMENT WAS GIVEN. GOES-8 IS CURRENTLY IN RAPID SCAN WHICH ONLY PROVIDES IMAGES OVER THE VOLCANO EVERY THREE HOURS. . TRAJECTORY: ANY ASH BETWEEN THE SUMMIT AND FL250 WOULD MOVE TO THE WEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 01/0030 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. . . NNNN