FVXX20 KNES 211840
VOLCANIC ASH ADVISORY
ISSUED: 2005APR21/1840Z   VAAC: WASHINGTON

VOLCANO: ANATAHAN 0804-20
LOCATION: N1621E14540   AREA: MARIANA.ISLANDS

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/186

INFORMATION SOURCE: GOES-12. GFS MODEL WINDS.
RADIOSONDE. 

ERUPTION DETAILS: CONTINOUS ASH AND STEAM
EMISSIONS

OBS ASH DATE/TIME: 21/1825Z

OBS ASH CLOUD: SFC/FL100 20NM WIDE LINE BETWEEN
N1712E14259 - N1623E14536. ASH IS MOVING W 25
KNOTS. 

FCST ASH CLOUD +6H: 22/0000Z SFC/FL100 20NM WIDE
LINE BETWEEN N1756E14259 - N1623E14537. 

FCST ASH CLOUD +12H: 22/0600Z SFC/FL100 20NM WIDE
LINE BETWEEN N1756E14300 - N1623E14537. 

FCST ASH CLOUD +18H: 22/1200Z SFC/FL100 20NM WIDE
LINE BETWEEN N1756E14300 - N1623E14537. 

REMARKS: MULTISPECTAL IMAGERY SHOWS A FAINT PLUME
EXTENDING APPROXIMAGELY 150 NMI WEST NORTHWEST OF
THE SUMMIT ...SCHWARTZ

NEXT ADVISORY: WILL BE ISSUED BY 2005APR22/0045Z

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-Graphic Map Depicting Ash