FVXX20 KNES 180811 VOLCANIC ASH ADVISORY ISSUED: 2005JUL18/0811Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA.ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2005/557 INFORMATION SOURCE: GFS MODEL WINDS. RADIOSONDE. GOES-9. USGS. ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND GASES OBS ASH DATE/TIME: 18/0725Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL220 MOVING TO NW 10 KNOTS. FCST ASH CLOUD +6H: 18/1330Z FCST ASH CLOUD +12H: 18/1930Z FCST ASH CLOUD +18H: 19/0130Z REMARKS: CLOUDS HAVE DEVELOPED OVER THE REGION AND HAVE OVERSPREAD THE PREVIOUSLY OBSERVED ASH THAT WAS MOVING NORTHWEST FROM THE ISLAND. THE ASH IS FORECAST TO MOVE MORE WESTERLY WITH TIME. ...SWANSON NEXT ADVISORY: WILL BE ISSUED BY 2005JUL18/1415Z NNNN