FVXX20 KWBC 182222 VOLCANIC ASH ADVISORY ISSUED: 2003NOV18/2230Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/506 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET ERUPTION DETAILS: ASH OBSERVED AT 18/1524Z OBS ASH DATE/TIME: 18/2215Z. OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/270 MOVING W 5 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS REMARKS: THE GUAYAQUIL MWO REPORTS THAT THE GEOPHYSICAL INSTITUTE OBSERVED ASH OVER THE VOLCANO AT 18/1524Z TO FL270. ASH HAS NOT BEEN SEEN THRU 18/2215Z IMAGERY BUT RECENT THUNDERSTORMS IN THE REGION HAVE MADE DETECTION NEAR IMPOSSIBLE. NEXT ADVISORY: WILL BE ISSUED BY 2003NOV19/0430Z NNNN