FVXX22 KWBC 201058
VOLCANIC ASH ADVISORY             
ISSUED: 2003MAY20/1100Z      VAAC: WASHINGTON
 
VOLCANO: ANATAHAN 0804-20
LOCATION: N1621E14540    AREA: MARIANA ISLANDS
 
SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2003/042
 
INFORMATION SOURCE:  GOES-9 IMAGERY. GFS MODEL WINDS FORECAST 

ERUPTION DETAILS: ONGOING ASH EMISSIONS...FIRST ERUPTION BEGAN
MAY 10
 
OBS ASH DATE/TIME: 20/0802Z AND 20/1013Z
 
OBS ASH CLOUD: SFC/FL070 60 NM WIDE LINE OF ASH EXTENDING BETWEEN
N1621E14540 N1635E14144. ASH IS MOVING W 10-15 KNOTS.

SFC/FL070 240 NM WIDE LINE OF ASH EXTENDING BETWEEN N1635E14144
N2234E13801.  ASH IS MOVING NW 10 KNOTS. 

SFC/FL070 120 NM WIDE LINE OF ASH EXTENDING BETWEEN N2234E13801
N2546E14110.  ASH IS MOVING NE 15-20 KNOTS.

FCST ASH CLOUD +6H: SEE SIGMETS. 

REMARKS: VISIBLE IMAGERY THROUGH 0802Z SHOWS A LARGE ASH PLUME
EXTENDING FROM THE SUMMIT TOWARD WEST AND THEN BECOMING MORE
NORTHWESTERLY AND THEN FINALLY APPROACHING A FRONTAL BOUNDARY AND
BECOMING NORTHEASTERLY. IT IS POSSIBLE THAT THERE IS ADDITIONAL
ASH FARTHER NORTH THAT IS HIDDEN BY THE FRONTAL CLOUDS. 
MULTISPECTRAL AND INFRARED IMAGERY THROUGH 1013Z SHOWS ONLY A
TINY FRACTION OF THE ASH THAT CAN BE SEEN IN VISIBLE IMAGERY SO
THE EARLIER (0802Z) VISIBLE IMAGE HAS BEEN RELIED UPON FOR MOST
OF THE OBS ASH CLOUD SECTION.

NEXT ADVISORY: WILL BE ISSUED BY 2003MAY20/1700Z.

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"Attached Graphic Map Depicting Ash Only" 

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