FVXX21 KWBC 200001 VOLCANIC ASH ADVISORY ISSUED: 2004JUL20/0001Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA.ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2004/31 INFORMATION SOURCE: GUAM MWO. GFS MODEL WINDS FORECAST. GOES-9 IMAGERY. ERUPTION DETAILS: OCCASIONAL VENTING OF GASES AND ASH OBS ASH DATE/TIME: NIL OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. FCST ASH CLOUD +6H: NOT AVBL FCST ASH CLOUD +12H: NOT AVBL FCST ASH CLOUD +18H: NOT AVBL REMARKS: ASH IS NOT SEEN IN THE LATEST VISIBLE IMAGERY ... NEXT ADVISORY: NO FURTHER ADVISORIES NNNN