FVXX23 KNES 311350 VA ADVISORY DTG: 20080731/1349Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 PSN: N1621 E14540 AREA: MARIANA.ISLANDS SUMMIT ELEV: 2585 FT (788 M) ADVISORY NR: 2008/129 INFO SOURCE: MTSAT. GFS WINDS. ERUPTION DETAILS: LOW LEVEL EMISSION OF GASES AND POSSIBLE LIGHT ASH OBS VA DTG: 31/1257Z OBS VA CLD: VA NOT IDENTIFIABLE FROM SATELLITE DATA WINDS SFC/FL060 100/17KT FCST VA CLD +6HR: 31/1900Z FCST VA CLD +12HR: 01/0100Z FCST VA CLD +18HR: 01/0700Z RMK: NO VA SEEN DUE TO CLOUDS AND DARKNESS. LAST VIS IMAGERY SHOWED SHORT PLUME MOVG WNW FROM ISLAND. ...SWANSON NXT ADVISORY: WILL BE ISSUED BY 20080731/2000Z NNNN