FVXX20 KWBC 181830 VOLCANIC ASH ADVISORY ISSUED: 2002APR18/1830Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S07826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2002/216 . INFORMATION SOURCE: GOES-8 IMAGERY. GUAYAQUIL MWO SIGMET. GEOPHYSICAL INSTITUTE . ERUPTION DETAILS: ONGOING ASH AND STEAM. . OBS ASH DATE/TIME: 18/1745Z . OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/220 MOVING W 10-15 KNOTS . FCST ASH CLOUD+6H: SEE SIGMETS. . REMARKS: ASH CANNOT BE SEEN IN SATELLITE IMAGERY THROUGH 18/1745Z DUE TO WEATHER CLOUDS OVER THE AREA. AT 1238Z THERE WAS AN AIRCRAFT REPORT OF WESTWARD MOVING ASH FL180/FL220. . NEXT ADVISORY: WILL BE ISSUED BY 2002APR19/0030Z. . NNNN