FVXX20 KWBC 141830
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VOLCANIC ASH ADVISORY STATEMENT 
ISSUED 1830 UTC 14 APR 1999 BY THE WASHINGTON VAAC

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SOUFRIERE HILLS 99-108    WEST INDIES 16.72N 62.18W  
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BACKGROUND:    SOUFRIERE HILLS  MONTSERRAT (1600-05)
               SUMMIT HEIGHT  3000 FT (915 M)
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SOURCES OF INFORMATION: INFRARED VISIBLE AND MULTISPECTRAL GOES-8
SATELLITE IMAGERY... 1200 UTC ST MARTIN (TACM) UPPER AIR DATA...
MONTSERRAT VOLCANO OBSERVATORY... PILOT REPORTS... SIGMETS... ETA
AND AVIATION MODEL FORECASTS. 
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ERUPTION DETAILS: INITIAL ERUPTION AT 14/0915 UTC.
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DETAILS OF ASH CLOUD: 1732 UTC GOES 8 VISIBLE SATELLITE IMAGERY
SHOWS ASH SPREADING IN SEVERAL DIRECTIONS AWAY FROM THE VOLCANO...
MAINLY TO THE NORTH AND WEST.  ASH BECOMING LESS DISCERNABLE ON
IMAGERY WITH TIME ... PARTICULARLY IN THE NORTHEAST EXTENT OF THE
PLUME. BECOMING MORE DIFFICULT TO ASSESS HEIGHT OF ASH DUE TO
SETTLING AND DISPERSION.  PILOT REPORTS CONSISTENTLY ASSIGN ASH AT
OR BELOW FL150.
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FROM THE SFC TO FL050 ASH IS BOUNDED BY POINTS 16.9N62.9W 17.3N63.5W
17.9N63.2W 18.1N62.7W 18.3N61.8W 17.9N61.9W 17.8N62.6W 16.9N62.6W.
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FROM FL050 TO FL100 ASH IS BOUNDED BY POINTS 18.4N61.7W 18.5N61.2W
18.4N61.2W 17.7N61.7W 17.8N61.8W.
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FROM FL100 TO FL150 ASH IS BOUNDED BY POINTS 16.9N63.1W 16.9N62.7W
16.6N62.7W 16.4N62.4W 16.4N63.2W 
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TRAJECTORY: FROM THE SFC TO FL050 ASH IS MOVING TO THE NORTHWEST AT
10 KT OR LESS.
FROM FL050 TO FL100 THE ASH IS MOVING TO THE NORTHEAST AT 10-15 KT.
FROM FL100 TO FL150 THE ASH IS MOVING TO THE WESTNORTHWEST AT 10 KT.
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THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY
A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS
www.ssd.noaa.gov/VAAC/messages.html
(all lower case except /VAAC/)
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OUTLOOK: SEE SIGMETS AND VAFTAD.
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THE NEXT MESSAGE WILL BE ISSUED BY 15/0000 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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"Attached Graphic Map Depicting Ash" 

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