FVXX21 KWBC 211535
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VOLCANIC ASH ADVISORY STATEMENT--CORRECTION TO TIME OF NEXT ISSUANCE
ISSUED 1535 UTC 21 MAR 1999 BY THE WASHINGTON VAAC
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POPOCATEPETL 99-044    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 VISIBLE IMAGERY...POPO CAMERA     
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ERUPTION DETAILS: ASH VENTING BEGINNING AT APPROXIMATELY 21/1335 UTC
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DETAILS OF ASH CLOUD: ANALYSIS OF THE LATEST VISIBLE SATELLITE
IMAGERY THROUGH 1445 UTC HAS INDICATED A DISTINCT MOTION TOWARD THE
EAST OF A PORTION OF THE ASH PLUME.  THIS HAS RESULTED IN A REVISION
OF MAXIMUM HEIGHT OF THE ASH CLOUD TO FL270.  AT 1445 UTC THE ASH
PLUME FORMED A V SHAPE BOUNDED BY THE SUMMIT 18.7N/98.2W 19.1N/98.2W
19.0N/98.4W AND THE SUMMIT. THAT PORTION OF THE PLUME WHICH
CONTINUES TO MOVE SOUTHEASTWARD IS ESTIMATED AT FL220 AND INCLUDES
THE ASH WHICH WAS MOST RECENTLY SEEN VENTING FROM THE SUMMIT. 
CUMULUS CLOUDS WERE OBSCURING THE VIEW OF THE SUMMIT THROUGH THE
EYES OF THE POPO CAMERA AT 1533 UTC. 
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TRAJECTORY: TOWARD THE SOUTHEAST BETWEEN 25 KTS AND 30 KTS AT FL220
BUT TOWARD THE EAST AT ABOUT 23 KNOTS AT FL270.
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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 VAFTAD AND SIGMETS.
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THE NEXT STATEMENT WILL BE ISSUED AROUND 2130 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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"Attached Graphic Map Depicting Ash" 

"Graphic Map Depicting Ash"