FVXX21 KWBC 1815
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1815 UTC 24 May 1999 BY THE WASHINGTON VAAC 
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POPOCATEPETL 99-069   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: CENEPRED...MEXICO MWO...PILOT REPORT...1200
UTC UPPER AIR DATA FROM MEXICO CITY
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ERUPTION DETAILS: ERUPTION AROUND 24/1750UTC.
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DETAILS OF ASH CLOUD: MEXICO CITY MWO HAS RECEIVED INFORMATION FROM
THE MEXICAN OBSERVATORY (CENEPRED) AND A PILOT REPORT INDICATING
THAT POPOCATEPETL HAD ERUPTED AT 1750 UTC.  THE HEIGHT OF THE ASH
TOPS WAS REPORTED BETWEEN FL210 AND FL250.  SATELLITE DATA IS NOT
YET AVAILABLE TO ANALYSE FOR THIS EVENT.
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TRAJECTORY: PILOT REPORTED LITTLE MOTION TO THE ASH CLOUD WHICH
AGREES WELL WITH THE UPPER AIR DATA FROM MEXICO CITY AT THE FL250
LEVEL SUGGESTING A SLOW 5 KNOT MOTION TO THE SOUTHWEST.
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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 WITHIN THE HOUR.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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