FVXX20 KNES 131703
VOLCANIC ASH ADVISORY
ISSUED: 2005AUG13/1702Z   VAAC: WASHINGTON

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

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/670

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

ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND
GASES

OBS ASH DATE/TIME: 13/1613Z

OBS ASH CLOUD: SFC/FL200 N1625E14648 - N1529E14658
- N1458E14411 - N1550E14406 - N1620E14539 -
N1625E14648 MOVING E 0-5 KNOTS. 

FCST ASH CLOUD +6H: 13/2200Z SFC/FL200 N1651E14648
- N1443E14723 - N1459E14437 - N1558E14426 -
N1651E14648 

FCST ASH CLOUD +12H: 14/0400Z SFC/FL200
N1611E14732 - N1432E14744 - N1447E14455 -
N1605E14452 - N1611E14732 

FCST ASH CLOUD +18H: 14/1000Z 

REMARKS: DUE TO A TROF IN THE REGION THE
EXCEPTIONALLY LIGHT AND VARIABLE WINDS MAKE THE
ASH MOVEMENT AND THE ASH FORECAST VERY UNCERTAIN. 
THE  BROAD DIFFUSE ASH OBSERVED SEEMS TO BE A
REMNANT OF LAST NIGHTS BETTER DEFINED PLUME.  THE
AREA SEEMS TO HAVE DRIFTED VERY SLOWLY EASTWARD IN
THE PAST COUPLE OF HOURS AND THE ASH VELOCITY IS
BASED ON THIS RATHER THAN MODEL GUIDANCE.  A PILOT
SOUTHWEST OF THE VOLCANO REPORTED A SULFUR ODOR AS
HE DESCENDED FROM FL190 TO FL140.  ...

NEXT ADVISORY: WILL BE ISSUED BY 2005AUG13/2300Z

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