FVXX20 KNES 210041
VOLCANIC ASH ADVISORY
ISSUED: 2005APR21/0040Z   VAAC: WASHINGTON

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

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/183

INFORMATION SOURCE: GFS MODEL WINDS. GOES-9. 

ERUPTION DETAILS: CONTINUOUS ASH AND STEAM
EMISSIONS.

OBS ASH DATE/TIME: 21/0002Z

OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE
DATA. WINDS SFC/FL100 MOVING TO W 10-15 KNOTS.

FCST ASH CLOUD +6H: 21/0645Z SFC/FL100 15NM WIDE
LINE BETWEEN N1619E14519 - N1620E14535. 

FCST ASH CLOUD +12H: 21/1245Z SFC/FL100 15NM WIDE
LINE BETWEEN N1619E14517 - N1620E14536. 

FCST ASH CLOUD +18H: NOT AVBL

REMARKS: LOW LEVEL WEATHER CLOUDS CONTINUE TO
DEVELOP TO THE EAST AND WEST OF THE ISLAND AND
MOVE TO THE WEST AT 10-15Z.  THERE MAY BE SOME
MIXING WITH ASH BUT IT IS NOT CERTAIN DUE TO
DESCREPANCIES BETWEEN THE VISIBLE AND
MULTISPECTRAL IMAGERY WHICH DOES NOT SHOW A
HOTSPOT.   MULTISPECTRAL IMAGERY SHOWS PLUME LIKE
FEATURE TO THE WEST OF THE SUMMIT THAT GETS
BRIGHTER AS IT MOVES AWAY AND THUS APPEARS TO BE
DEVELOPING CLOUDS. ...BALDWIN

NEXT ADVISORY: WILL BE ISSUED BY 2005APR21/0645Z

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