FVXX23 KNES 310757
VA ADVISORY
DTG: 20080731/0756Z

VAAC: WASHINGTON

VOLCANO: ANATAHAN 0804-20
PSN: N1621 E14540

AREA: MARIANA.ISLANDS

SUMMIT ELEV: 2585 FT (788 M)

ADVISORY NR: 2008/128

INFO SOURCE: MTSAT. GFS WINDS. SEISMIC DETECTION.
RADIOSONDE. AVO

ERUPTION DETAILS: INCREASED HARMONIC TREMOR

OBS VA DTG: 31/0657Z

OBS VA CLD: SFC/FL050 7NM WIDE LINE BETWEEN N1635
E14507 - N1623 E14519 - N1620 E14540. MOV W
15-20KT 

FCST VA CLD +6HR: 31/1300Z SFC/FL050 15NM WIDE
LINE BETWEEN N1625 E14440 - N1621 E14540. 

FCST VA CLD +12HR: 31/1900Z SFC/FL050 15NM WIDE
LINE BETWEEN N1625 E14440 - N1621 E14540. 

FCST VA CLD +18HR: 01/0100Z SFC/FL050 15NM WIDE
LINE BETWEEN N1624 E14440 - N1621 E14540. 

RMK: A VERY LIGHT PLUME WITH POSSIBILITIES OF ASH
CONTENT CAN BE SEEN MOVING WEST FROM THE ISLAND. 
AVO INDICATED INCREASED HARMONIC TREMOR THAT
MATCHES WITH INCREASES IN PLUME DENSITY...THOUGH
STILL LIGHT. ...GALLINA

NXT ADVISORY: WILL BE ISSUED BY 20080731/1400Z

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