FVXX21 KWBC 181245
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CORRECTION TO TRAJECTORY WIND SPEED
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1245 UTC 18 MAR 1999 BY THE WASHINGTON VAAC
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POPOCATEPETL 99-024    MEXICO  19.02N 98.62W 
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BACKGROUND:    POPOCATEPETL   MEXICO (1401-09)
               SUMMIT HEIGHT 17930 FT (5465 M)
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SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. 
MEXICO CITY UPPER AIR SOUNDING. MWO REPORT.
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ERUPTION DETAILS: ERUPTION OCCURRED AROUND 18/1130 UTC     
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DETAILS OF ASH CLOUD: GOES 8 IMAGERY THROUGH 1145 UTC INDICATES A
PLUME OF ASH EMANATING FROM POPOCATEPETL. ASH ESTIMATED BETWEEN
FL350 AND FL400 IS 30KM (16NMI) WIDE AND EXTENDS FROM 19.04N 98.58W
TO 19.32N 98.14W. 
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TRAJECTORY: 0000 UTC MEXICO CITY SOUNDING SUGGESTS ASH BETWEEN FL350
AND FL400 WOULD MOVE TOWARD THE NORTHEAST AT 65 TO 70KTS.
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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 AT 18/1900 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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