FVXX21 KWBC 211040
VOLCANIC ASH ADVISORY 
ISSUED 1040 UTC 21 NOV 2000 BY THE WASHINGTON VAAC
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POPOCATEPETL 00-121         MEXICO 1901N 9837W 
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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 METEOROLOGICAL WATCH OFFICE. MEXICO CITY
UPPER AIR SOUNDING. 
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ERUPTION DETAILS: EXHALATIONS AT 1019 UTC AND 1021 UTC.
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DETAILS OF ASH CLOUD: THE MEXICO CITY MWO REPORTED TWO
MODERATE EXHALATIONS OF THE VOLCANO BUT COULD NOT CONFIRM
WHETHER THERE WAS ASH PRESENT DUE TO CLOUDS AND DARKNESS.
SATELLITE IMAGERY FOR THE RELEVANT TIMES IS NOT YET AVAILABLE.
THE NEXT MESSAGE WILL BE ISSUED AS SOON AS 21/1045 UTC IMAGERY
IS AVAILABLE.
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TRAJECTORY: ACCORDING TO THE 21/0000 UTC UPPER AIR SOUNDING,
ANY ASH PRESENT FROM SUMMIT LEVEL TO FL250 WOULD MOVE TOWARD
THE EAST AND NORTHEAST AT ABOUT 5 TO 15 KNOTS. 
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OUTLOOK: SEE SIGMETS 
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THE NEXT MESSAGE WILL BE ISSUED BY 21/1115 UTC.
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REAL TIME SATELLITE IMAGERY AND VOLCANIC ASH ADVISORIES OFTEN
ACCOMPANIED BY A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT
INTERNET URL ADDRESS
HTTP://WWW.SSD.NOAA.GOV/VAAC/WASHINGTON.HTML
(ALL LOWER CASE EXCEPT /VAAC/)
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. 
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CLARK
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