FVXX20 KWBC 250555
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VOLCANIC ASH ADVISORY STATEMENT 
ISSUED 0555 UTC 25 APR 1999 BY THE WASHINGTON VAAC
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SOUFRIERE HILLS 99-118   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. 0000 UTC
GUADELOUPE UPPER AIR SOUNDING.
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ERUPTION DETAILS: SEISMIC EXPLOSIVE EVENT AROUND 25/0505 UTC.
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DETAILS OF ASH CLOUD: ASH CANNOT BE DETECTED IN SATELLITE IMAGERY DUE
TO THE SATELLITE BEING IN A KEEP OUT ZONE (KOZ).  THE MONTSERRAT
VOLCANO OBSERVATORY REPORTED THAT BASED UPON SEISMIC INFORMATION THE
ASH PLUME IS PROBABLY UP TO AT LEAST FL100.  THEY COULD NOT VISUALLY
SEE THE PLUME DUE TO DARKNESS.
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TRAJECTORY: UP TO FL050 ASH WOULD MOVE NORTHWEST AT ABOUT 5 KTS.
BETWEEN FL050 AND FL1OO ASH WOULD MOVE MORE TO THE NORTH AT ABOUT 7
KTS.
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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 AROUND 25/1200 UTC UNLESS ADDITIONAL
INFORMATION BECOMES AVAILABLE.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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