FVXX21 KWBC 211115
VOLCANIC ASH ADVISORY 
ISSUED 1115 UTC 21 NOV 2000 BY THE WASHINGTON VAAC
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POPOCATEPETL 00-122         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
SATELLITE IMAGERY. MEXICO CITY METEOROLOGICAL WATCH OFFICE.
21/0000 UTC MEXICO CITY UPPER AIR SOUNDING. 
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ERUPTION DETAILS: STEAM AND POSSIBLE ASH EXHALATIONS AT 1019
UTC AND 1021 UTC AND 1100 UTC.
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DETAILS OF ASH CLOUD: THE MEXICO CITY MWO REPORTED THREE
MODERATE EXHALATIONS OF THE VOLCANO BUT COULD NOT CONFIRM
WHETHER THERE WAS ASH PRESENT DUE TO CLOUDS AND DARKNESS.
SATELLITE IMAGERY THROUGH 21/1045 UTC SHOWS EXTENSIVE CLOUDS
OVER THE AREA MAKING ASH DETECTION DIFFICULT. THE MEXICO CITY
MWO ESTIMATED THE HEIGHT OF THE POSSIBLE ASH AND STEAM BETWEEN
FL170 AND FL220. 
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TRAJECTORY: THE UPPER AIR SOUNDING SUGGESTS THAT ANY ASH
PRESENT FROM SUMMIT LEVEL TO FL220 WOULD MOVE TOWARD THE WEST
AND NORTHWEST AT ABOUT 5 TO 15 KNOTS. 
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OUTLOOK: SEE SIGMETS 
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THE NEXT MESSAGE WILL BE ISSUED BY 21/1715 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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