FVXX20 KNES 201636
VOLCANIC ASH ADVISORY
ISSUED: 2005AUG20/1635Z VAAC: WASHINGTON
VOLCANO: ANATAHAN 0804-20
LOCATION: N1621E14540 AREA: MARIANA.ISLANDS
SUMMIT ELEVATION: 2585 FT (788 M)
ADVISORY NUMBER: 2005/699
INFORMATION SOURCE: GFS MODEL WINDS. RADIOSONDE.
PILOT REPORT. GOES-9.
ERUPTION DETAILS: CONTINUOUS ASH EMISSIONS
OBS ASH DATE/TIME: 20/1525Z
OBS ASH CLOUD: SFC/FL150 10NM WIDE LINE BETWEEN
N1817E14604 - N1737E14547 - N1622E14540. ASH IS
MOVING N 5-10 KNOTS.
FCST ASH CLOUD +6H: 20/2130Z SFC/FL150 10NM WIDE
LINE BETWEEN N1818E14608 - N1620E14540.
FCST ASH CLOUD +12H: 21/0330Z SFC/FL150 10NM WIDE
LINE BETWEEN N1813E14611 - N1621E14540.
FCST ASH CLOUD +18H: 21/0930Z SFC/FL150 10NM WIDE
LINE BETWEEN N1759E14533 - N1718E14513 -
N1645E14516 - N1621E14541.
REMARKS: A FAINT TO MODERATE ASH PLUME CAN BE SEEN
EXTENDING FROM THE VOLCANO TOWARD THE NORTH
NORTHEAST. THIS PLUME IS ESTIMATED TO BE BELOW
FL150. THE ASH TO FL240 OBSERVED MORE THAN 6
HOURS AGO BY A PILOT CANNOT BE SEEN IN SATELLITE
IMAGERY AT THIS TIME. ASH HEIGHT ASSIGNMENTS
WERE BASED ON GFS MODEL RATHER THAN GUAM 12Z
RADIOSONDE BECAUSE OF SUBSTANTIAL CHANGE IN WIND
DIRECTION OCCURRING ABOVE FL100 BETWEEN GUAM AND
ANATAHAN. ...
NEXT ADVISORY: WILL BE ISSUED BY 2005AUG20/2230Z
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