FVXX20 KNES 091640 VOLCANIC ASH ADVISORY ISSUED: 2005AUG09/1639Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA.ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2005/653 INFORMATION SOURCE: GFS MODEL WINDS. GOES-9. ERUPTION DETAILS: CONTINUOUS ASH EMISSIONS OBS ASH DATE/TIME: 09/1525Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL100 MOVING TO W 15-20 KNOTS. FL100/FL250 MOVING TO NW 15-25 KNOTS. FCST ASH CLOUD +6H: 09/2130Z FCST ASH CLOUD +12H: 10/0330Z FCST ASH CLOUD +18H: 10/0930Z REMARKS: A PLUME APPEARED TO BE SEEN IN IMAGERY EARLIER THRU ABOUT 12Z EXTENDING TO THE NORTHWEST OF THE VOLCANO. HOWEVER IT HAS SINCE BECOME OBSCURED BY THUNDERSTORMS AND OTHER CLOUDS. IT IS POSSIBLE THAT ANY ASH TO THE NORTHWEST OF THE VOLCANO COULD BECOME ENTRAINED IN THE THUNDERSTORM AND LOFTED TO A HIGHER LEVEL. ANY ASH WOULD MOVE TO THE WEST UP TO ABOUT FL100 AND THEN SHIFT TO THE NORTHWEST BETWEEN FL100 AND FL250 BASED ON THE MODEL. ...RUMINSKI NEXT ADVISORY: WILL BE ISSUED BY 2005AUG09/2245Z NNNN