FVXX21 KWBC 161838 VOLCANIC ASH ADVISORY ISSUED: 2004JUL16/1838Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA.ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2004/018 INFORMATION SOURCE: GFS MODEL WINDS FORECAST. GOES-9 IMAGERY. ERUPTION DETAILS: NEARLY CONTINUOUS VENTING OF GASES AND LIGHT ASH. OBS ASH DATE/TIME: 16/1802Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL050 MOVING TO W 15-20 KNOTS. FCST ASH CLOUD +6H: NOT AVBL FCST ASH CLOUD +12H: NOT AVBL FCST ASH CLOUD +18H: NOT AVBL REMARKS: ASH CAN NO LONGER BE SEEN WITH THE LOSS OF VISIBLE SATELLITE IMAGERY. HOWEVER..SEISMIC ACTIVITY REMAINS ELEVATED. ...RUMINSKI NEXT ADVISORY: WILL BE ISSUED BY 2004JUL17/0045Z NNNN