FVXX20 KWBC 151130 VOLCANIC ASH ADVISORY ISSUED: 2002JAN15/1128Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2002/018 . INFORMATION SOURCE: SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE. INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. WIND FORECAST FROM AVIATION MODEL. . ERUPTION DETAILS: ASH OBSERVED AT 15/1100Z. . DETAILS OF ASH CLOUD: A SIGMET CITES AN 11Z PILOT OBSERVATION OF WESTWARD MOVING ASH BETWEEN FL160 AND FL180. NO ASH CAN BE DETECTED IN SATELLITE IMAGERY THROUGH 1045Z. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT FL180 ASH WOULD MOVE TO THE WEST OR SOUTHWEST AT ABOUT 15 KNOTS. . OUTLOOK: SEE SIGMETS. . NEXT ADVISORY: WILL BE ISSUED BY 2002JAN15/1730Z. . NNNN