FVXX20 KNES 210639
VOLCANIC ASH ADVISORY
ISSUED: 2005APR21/0638Z   VAAC: WASHINGTON

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

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/184

INFORMATION SOURCE: GFS MODEL WINDS. RADIOSONDE.
GOES-9. 

ERUPTION DETAILS: CONTINUOUS LOW LEVEL EMISSION.

OBS ASH DATE/TIME: 21/0602Z

OBS ASH CLOUD: SFC/FL100 20NM WIDE LINE BETWEEN
N1636E14322 - N1620E14540. ASH IS MOVING W 25
KNOTS. 

FCST ASH CLOUD +6H: 21/1200Z SFC/FL100 25NM WIDE
LINE BETWEEN N1628E14223 - N1620E14541. 

FCST ASH CLOUD +12H: 21/1800Z SFC/FL100 25NM WIDE
LINE BETWEEN N1646E14332 - N1620E14541. 

FCST ASH CLOUD +18H: 22/0000Z SFC/FL100
N1738E14359 - N1619E14542 - N1558E14400 -
N1638E14258 - N1738E14359 

REMARKS: A FAINT PLUME OF STEAM AND LIGHT ASH CAN
BE SEEN IN VISIBLE IMAGERY EXTENDING AROUND 110 NM
WEST FROM THE ISLAND.  BASED ON DIRECTION AND
SPEED IT IS ESTIMATED BELOW FL100.  ...SWANSON

NEXT ADVISORY: WILL BE ISSUED BY 2005APR21/1245Z

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-Graphic Map Depicting Ash