FVXX20 KWBC 201045
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1045 UTC 20 JULY 1999 BY THE WASHINGTON VAAC 
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SOUFRIERE HILLS 99-179    WEST INDIES 16.7N 62.2W  
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BACKGROUND:    SOUFRIERE HILLS MONTSERRAT (1600-05)
               SUMMIT HEIGHT 3000 FT (915M)
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SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY
THROUGH 20/1015 UTC.  MONTSERRAT VOLCANO OBSERVATORY.  00 UTC
GUADELOUPE RADIOSONDE.

ERUPTION DETAILS:  ERUPTION OCCURRED AT ABOUT 20/0910 UTC.
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DETAILS OF ASH CLOUD: THE 1015 UTC SATELLITE IMAGE SHOWS ASH
APPROXIMATELY BOUNDED BY THE POINTS 17.3N61.8W 16.9N61.8W 16.6N62.1W
16.6N62.6W 16.8N62.5W 16.8N62.1W 17.2N62.1W AND 17.3N61.8W.  ASH TO
THE EAST NORTHEAST OF THE SUMMIT IS BELIEVED TO BE ABOVE FL330 AND
PERHAPS AS HIGH AS FL400. ASH TO THE WEST OF THE SUMMIT IS AT A LOWER
LEVEL PROBABLY BELOW FL220. 
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TRAJECTORY: ASH IS MOVING TO THE EAST NORTHEAST AT ABOUT 25 KNOTS. 
ASH IS ALSO MOVING TOWARD THE WEST AT ABOUT 15 TO 20 KNOTS.

REAL TIME SATELLITE IMAGERY ALONG WITH 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/washington.html
(all lower case except /VAAC/)
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OUTLOOK:  SEE LATEST SIGMETS.
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THE NEXT MESSAGE WILL BE ISSUED BY 20/1645 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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