FVXX20 KWBC 190945
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VOLCANIC ASH ADVISORY STATEMENT  - COR TO ASH HEIGHT
ISSUED 0945 UTC 19 APR 1999 BY THE WASHINGTON VAAC
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SOUFRIERE HILLS 99-114   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: MONTSERRAT VOLCANO OBSERVATORY. GOES-8
MULTISPECTRAL IMAGERY. GOES-8 SATELLITE DERIVED HIGH DENSITY WINDS.
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ERUPTION DETAILS: ASH VENTING APPROX 0838 UTC.
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DETAILS OF ASH CLOUD: MVO REPORTS A SMALL ASH VENTING OF SOUFRIERE
HILLS AT AROUND 0838 UTC. THIS ASH IS VISIBLE IN GOES-8 SPLIT WINDOW
IMAGERY MOVING SOUTHWEST OFF OF THE ISLAND. 0915 GOES-8 IMAGERY
SHOWS THE ASH CLOUD EXTENDING 52 KM (28 NMI) FROM 16.72N 62.18W TO
16.47N 62.58W WITH A WIDTH OF 18 KM (10 NMI). THIS ASH IS ESTIMATED
TO BE AT OR BELOW FL200 BASED ON THE 19/00 UTC SOUNDING OUT OF
GUADELOUPE.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH AT OR BELOW FL200 TO
MOVE SOUTHWEST AT 20 TO 30 KNOTS. ASH BELOW FL100 WOULD MOVE WEST AT
10 TO 20 KNOTS.
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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.
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THE NEXT MESSAGE WILL BE ISSUED BY 19/1600 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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