FVXX20 KWBC 131811 VOLCANIC ASH ADVISORY ISSUED: 2003JUN13/1815Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/079 INFORMATION SOURCE: GOES-12 IMAGERY. AVN MODEL WINDS FORECAST. GEOPHYSICAL INSTITUTE. PILOT REPORTS. ERUPTION DETAILS: ASH EMISSIONS STARTING AT 06/2000Z. OBS ASH DATE/TIME: 13/1745Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE IN SATELLITE DATA. WINDS SFC/FL260 MOVING W 15-20 KNOTS. FCST ASH CLOUD +6H: SEE SIGMETS. REMARKS: FREQUENT WEATHER CLOUD COVER OVER THE SUMMIT HAS MADE ASH DETECTION EXTREMELY DIFFICULT FOR THE PAST FEW HOURS. TWO PILOT REPORTS INDICATED ASH CLOUD TO FL200 AND FL260...SO WILL KEEP THE HEIGHT AT FL260...GALLINA NEXT ADVISORY: WILL BE ISSUED BY 20003JUN14/0015Z. NNNN