FVXX21 KWBC 170642 VOLCANIC ASH ADVISORY ISSUED: 2004JUL17/0639Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA.ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2004/020 INFORMATION SOURCE: GFS MODEL WINDS FORECAST. GOES-9 IMAGERY. ERUPTION DETAILS: CONTINUOUS VENTING OF GASES AND LIGHT ASH OBS ASH DATE/TIME: 17/0602Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL050 MOVING TO W 12-20 KNOTS. FCST ASH CLOUD +6H: NOT AVBL FCST ASH CLOUD +12H: NOT AVBL FCST ASH CLOUD +18H: NOT AVBL REMARKS: ASH COULD NOT BE DETECTED IN SATELLITE IMAGERY THROUGH 0602Z BUT LOW LEVEL WEATHER CLOUDS MIGHT BE HINDERING ASH DETECTION. ... NEXT ADVISORY: WILL BE ISSUED BY 2004JUL17/1245Z NNNN