FVXX22 KWBC 171234 VOLCANIC ASH ADVISORY ISSUED: 2003JUL17/1300Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2003/279 INFORMATION SOURCE: GOES 9 IMAGERY. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: ASH AND GAS EMISSIONS SINCE MAY 10. OBS ASH DATE/TIME: 17/1202Z. OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL080 MOVING W 15-20 KNOTS. FCST ASH CLOUD +6H: SEE SIGMETS. REMARKS: ASH IS NOT VISIBLE IN SATELLITE IMAGERY THROUGH 17/1202Z DUE TO EXTENSIVE WEATHER CLOUDS. GFS MODEL WINDS WOULD FORECAST ASH MOVEMENT TO THE WNW OR 112 DEGREES AT 15 KNOTS NEAR THE SURFACE AND INCREASING TO 20 KNOTS BY FL080...GALLINA NEXT ADVISORY: WILL BE ISSUED BY 2003JUL17/1900Z. NNNN