FVXX20 KNES 072209
VOLCANIC ASH ADVISORY
ISSUED: 2005JUL07/2209Z   VAAC: WASHINGTON

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

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/512

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

ERUPTION DETAILS: ONGOING ASH EMISSIONS

OBS ASH DATE/TIME: 07/2125Z

OBS ASH CLOUD: SFC/FL200 30NM WIDE LINE BETWEEN
N1628E14405 - N1621E14538. ASH IS MOVING W 5-10
KNOTS. SFC/FL100 N1740E14034 - N1629E14224 -
N1642E14406 - N1613E14404 - N1447E14043 -
N1557E13919 - N1205E13007 - N1500E13009 -
N1616E13836 - N1740E14034 MOVING W 5-10 KNOTS. 

FCST ASH CLOUD +6H: 08/0325Z SFC/FL200 N1718E14125
- N1635E14538 - N1559E14540 - N1453E14154 -
N1718E14125 SFC/FL100 N1720E14126 - N1455E14154 -
N1207E13211 - N1614E13109 - N1720E14126 

FCST ASH CLOUD +12H: 08/0925Z SFC/FL200
N1734E14014 - N1635E14538 - N1556E14540 -
N1435E14032 - N1734E14014 SFC/FL100 N1737E14014 -
N1437E14032 - N1214E13219 - N1636E13111 -
N1737E14014 

FCST ASH CLOUD +18H: 08/1525Z SFC/FL200
N1735E14014 - N1633E14538 - N1556E14540 -
N1435E14031 - N1735E14014 SFC/FL100 N1739E14014 -
N1438E14032 - N1200E13126 - N1531E13053 -
N1739E14014 

REMARKS: A PILOT REPORT AT 2120Z INDICATED A
SIGNIFICANT CHANGE IN THE VOLCANIC ASH CLOUD
HEIGHT TO FL200.  SPLIT WINDOW IMAGERY SHOWS A
HIGHER SIGNAL WITH THE PLUME NEAR THE SUMMIT
POSSIBLY INDICATING HIGHER HEIGHTS.  WEST FO 142E
THE SIGNAL IS LESS AN ARE PROBABLY LESS THAN FL200
AND TURNING TO INTO A VOG AREA.  WILL ESTIMATE THE
HEIGHT OF THIS AREA AS BELOW FL100...THOUGH IT IS
MORE LIKELY A STEADY SLOPE FROM FL200 TO THE SFC
THE FURTHER WEST ONE GOES AS THE ASH FALLS WITH
TIME. ...GALLINA

NEXT ADVISORY: WILL BE ISSUED BY 2005JUL08/0415Z

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