FVXX22 KWBC 310100 VOLCANIC ASH ADVISORY ISSUED: 2003MAY31/0100Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2003/086 INFORMATION SOURCE: GOES-9 IMAGERY. GFS MODEL WINDS FORECAST. PILOT REPORT ERUPTION DETAILS: CONTINUOUS ASH AND GAS EMISSIONS SINCE MAY 10. OBS ASH DATE/TIME: 31/0025Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL080 MOVING N 5-10 KNOTS. FL080/FL120 E 5 KNOTS. FL120/200 SE 15-20 KNOTS. FL200/250 S 15-25 KNOTS FCST ASH CLOUD +6H: SEE SIGMETS REMARKS: SATELLITE IMAGERY THROUGH 31/0025Z SHOWS MULTILAYERED CLOUDS OBSCURING THE VOLCANO. A PILOT REPORT WAS RECEIVED INDICATING THAT ASH WAS NOW UP TO FL250 DUE TO A FAIRLY VIGOROUS ERUPTION. FL200 WINDS WERE REPORTED TO BE S AT 15 KNOTS AND FL250 WINDS WERE REPORTED TO BE S AT 25 KNOTS. NEXT ADVISORY: WILL BE ISSUED BY 2003MAY31/0700Z. NNNN