FVXX20 KWBC 271948 CCB VOLCANIC ASH ADVISORY CORRECTION ISSUED: 2003OCT27/1930Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/421 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: CONTINUED ASH AND STEAM EXHALATIONS. OBS ASH DATE/TIME: 28/1845Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA WINDS FL100/240 MOVING E 10-15 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS REMARKS: CORRECTED FOR DIRECTION OF ASH MOVEMENT BASED ON A 1930Z OBSERVATION FROM THE GEOPHYSICAL INSTITUTE. ASH COULD NOT BE DETECTED AT 1845Z DUE TO EXTENSIVE CLOUD COVER. TURK NEXT ADVISORY: WILL BE ISSUED BY 2003OCT28/0130Z. NNNN