FVXX22 KWBC 170056 VOLCANIC ASH ADVISORY ISSUED: 2003JUL17/0100Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2003/277 INFORMATION SOURCE: GOES 9 IMAGERY. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: ASH AND GAS EMISSIONS SINCE MAY 10. OBS ASH DATE/TIME: 17/0025Z. OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL080 MOVING W 15-20 KNOTS. FCST ASH CLOUD +6H: SEE SIGMETS. REMARKS: EXTENSIVE CLOUD COVER OBFUSCATE THE REGION AROUND THE VOLCANO MAKING DETECTION OF ASH EXTREMELY DIFFICULT THROUGH 17/0025Z....WALTER NEXT ADVISORY: WILL BE ISSUED BY 2003JUL17/0700Z. NNNN