FVXX21 KWBC 040730 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0730 UTC 04 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-398 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. UPPER WIND FORECAST FROM THE AVIATION MODEL. THE APRIL 3 REPORT FROM THE GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 04/0645 UTC DUE TO WEATHER CLOUDS COVERING THE AREA. ON THE AFTERNOON OF APRIL 3 THE GEOPHYSICAL INSTITUTE REPORTED ASH 2 KM ABOVE THE SUMMIT WHICH WOULD MEAN ASH UP TO ABOUT FL230. THIS ASH WAS REPORTED TO BE MOVING WEST AND NORTHWEST. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL230 WOULD MOVE TOWARD THE WEST AT ABOUT 10 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 04/1330 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. . STREETT . NNNN