FVXX20 KWBC 201330
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1330 UTC 20 JULY 1999 BY THE WASHINGTON VAAC 
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SOUFRIERE HILLS 99-180    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 20/1245 UTC.  MONTSERRAT VOLCANO OBSERVATORY.  12 UTC
GUADELOUPE RADIOSONDE.

ERUPTION DETAILS:  ERUPTION OCCURRED AT ABOUT 20/0910 UTC.
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DETAILS OF ASH CLOUD: THE 1245 UTC SATELLITE IMAGE SHOWS LOW LEVEL ASH 
EXTENDING FROM THE SUMMIT (16.7N 62.2W) WESTWARD TO 16.8N 63.3W.  THE
LOW LEVEL ASH PLUME IS APPROXIMATELY 22 NMI WIDE.  UPPER LEVEL ASH
PLUME EXTENDS FROM THE SUMMIT TO 18.4N 61.2W AND IS 27 NMI WIDE NEAR
THE SUMMIT AND FANS OUT TO 66 NMI WIDE AT THE PLUME EDGE.
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TRAJECTORY: ASH BETWEEN THE SUMMIT AND FL120 IS MOVING TOWARDS THE
WEST AT 20 KNOTS.  ASH BETWEEN FL120 AND FL200 IS MOVING TOWARDS THE
WEST AT 5-10 KNOTS.  ASH BETWEEN FL200 AND FL230 IS NEARLY STATIONARY
DUE TO LIGHT AND VARIABLE WINDS.  ASH ABOVE FL230 IS MOVING TOWARDS
THE NORTHEAST AT 20-25 KNOTS.
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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 AND VAFTAD.
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THE NEXT MESSAGE WILL BE ISSUED BY 20/1930 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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NNNN
"Attached Graphic Map Depicting Ash" 

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