FVXX21 KWBC 171844 VOLCANIC ASH ADVISORY ISSUED: 2004JUL17/1843Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA.ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2004/022 INFORMATION SOURCE: GFS MODEL WINDS FORECAST. GOES-9 IMAGERY. ERUPTION DETAILS: CONTINUOUS VENTING OF GASES AND ASH. OBS ASH DATE/TIME: 17/1802Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL050 MOVING TO W 15 KNOTS. FCST ASH CLOUD +6H: NOT AVBL FCST ASH CLOUD +12H: NOT AVBL FCST ASH CLOUD +18H: NOT AVBL REMARKS: LOW LEVEL ASH TO FL050 CONTINUES TO MOVE TOWARDS THE W AT 15 KTS. ASH CAN NOT BE DETECTED IN SATELLITE IMAGERY. ...KARST NEXT ADVISORY: WILL BE ISSUED BY 2004JUL18/0045Z NNNN