FVXX20 KNES 021907
VOLCANIC ASH ADVISORY
ISSUED: 2005MAY02/1907Z   VAAC: WASHINGTON

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

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/231

INFORMATION SOURCE: GUAM MWO. GOES-12. GFS MODEL
WINDS. RADIOSONDE. METAR. GOES-9. USGS. 

ERUPTION DETAILS: ONGOING EMISSIONS - STRONGER
ACTIVITY AT 02/1649Z.

OBS ASH DATE/TIME: 02/1802Z

OBS ASH CLOUD: SFC/FL200 10NM WIDE LINE BETWEEN
N1646E14559 - N1622E14540. ASH IS MOVING NE 5-10
KNOTS. SFC/FL130 N1809E14232 - N1719E14438 -
N1631E14538 - N1612E14540 - N1700E14216 -
N1809E14232 MOVING NW 10-15 KNOTS. 

FCST ASH CLOUD +6H: 03/0100Z SFC/FL200 N1658E14559
- N1620E14604 - N1615E14543 - N1628E14539 -
N1658E14559 SFC/FL130 N1833E14201 - N1737E14417 -
N1630E14538 - N1612E14539 - N1626E14201 -
N1833E14201 

FCST ASH CLOUD +12H: 03/0700Z SFC/FL100
N1853E14137 - N1731E14446 - N1630E14540 -
N1611E14540 - N1549E14147 - N1853E14137 

FCST ASH CLOUD +18H: 03/1300Z SFC/FL100
N1854E14135 - N1628E14540 - N1606E14541 -
N1552E14146 - N1854E14135 

REMARKS: USGS INFORMED THAT SEISMIC ACTIVITY ENDED
AND BEGAN AGAIN WITH AN QUAKE AT 1620Z. AT 1649Z
MULTI-SPECTRAL IMAGERY SHOWED A VERY HIGH ASH
SIGNAL AT THE VOLCANO. THERE IS CONFLICTING DATA
INDICATING ASH REACHING ABOVE FL300...HOWEVER...IT
WAS MORE LIKELY ASH WAS INGESTED INTO A WEAK
THUNDERSTORM WHICH HAS SINCE DISSIPATED AND THE
SIGNAL AS WEAKENED SIGNIFICANTLY. OTHERWISE...ASH
BELOW THE INVERSION FL130 IS DENSE AND MOVING
WEST.  ...GALLINA

NEXT ADVISORY: WILL BE ISSUED BY 2005MAY03/0100Z

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