FVXX22 KWBC 171900 VOLCANIC ASH ADVISORY ISSUED: 2003JUN17/1900Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2003/159 INFORMATION SOURCE: GOES-9 IMAGERY. GFS MODEL WINDS FORECAST. ERUPTION DETAILS: CONTINUOUS ASH AND GAS EMISSIONS SINCE MAY 10. OBS ASH DATE/TIME: 17/1825Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL100 MOVING W 15 KNOTS. FCST ASH CLOUD +6H: SEE SIGMETS. REMARKS: THOUGH CLOUDS HAVE BROKEN AROUND THE ISLAND... DARKNESS AND SOME CLOUDS OVER THE AREA MAKE ANY LOW LEVEL ASH DETECTION DIFFICULT. NEXT ADVISORY: WILL BE ISSUED BY 2003JUN18/0100Z. NNNN