FVXX20 KNES 042139
VOLCANIC ASH ADVISORY
ISSUED: 2005JUL04/2138Z   VAAC: WASHINGTON

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

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/497

INFORMATION SOURCE: GFS MODEL WINDS. PILOT REPORT.
GOES-9. USGS. 

ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND
GASES

OBS ASH DATE/TIME: 04/2102Z

OBS ASH CLOUD: SFC/FL150 25NM WIDE LINE BETWEEN
N1619E14543 - N1602E14155. ASH IS MOVING W 15-20
KNOTS. 

FCST ASH CLOUD +6H: 05/0300Z SFC/FL150 30NM WIDE
LINE BETWEEN N1619E14543 - N1554E14248 -
N1559E13932. 

FCST ASH CLOUD +12H: 05/0900Z SFC/FL150 30NM WIDE
LINE BETWEEN N1620E14541 - N1515E13936. 

FCST ASH CLOUD +18H: 05/1500Z SFC/FL150 40NM WIDE
LINE BETWEEN N1620E14541 - N1558E14201. 

REMARKS: IT APPEARS AS THOUGH THE INCREASED
SEISMIC SIGNAL HAD MORE TO DO WITH THE DENSITY OF
THE EMISSION THAN AMPLITUDE.  AT 2049Z THERE WAS A
PILOT REPORT THAT THE EMSSION WAS AROUND FL140
MOVING WEST FROM THE VOLCANO.  SATELLITE IMAGERY
SHOW THAT THE PLUME IS A BIT MORE THICK WITH ASH
THAN THE PREVIOUS FEW HOURS PRIOR TO THE INCREASED
SEISMIC SIGNAL.  ...

NEXT ADVISORY: WILL BE ISSUED BY 2005JUL05/0345Z

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