FVXX21 KWBC 211715
VOLCANIC ASH ADVISORY 
ISSUED 1715 UTC 21 NOV 2000 BY THE WASHINGTON VAAC
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POPOCATEPETL 00-123         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 VISIBLE INFRARED AND
MULTISPECTRAL SATELLITE IMAGERY. AVIATION MODEL WIND FORECAST.
MEXICO CITY METEOROLOGICAL WATCH OFFICE SIGMET
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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: NO ASH CAN BE SEEN IN SATELLITE IMAGERY
THROUGH 21/1702 UTC BUT IT IS POSSIBLE THAT WEATHER CLOUDS ARE
HINDERING ASH DETECTION. BETWEEN 21/1000 UTC AND 21/1100 UTC
THE MEXICO CITY METEOROLOGICAL WATCH OFFICE REPORTED THREE
EXHALATIONS WITH POSSIBLE ASH BETWEEN FL170 AND FL220. 
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TRAJECTORY: IF THERE IS ANY ASH PRESENT BETWEEN SUMMIT LEVEL
AND FL220 IT WOULD MOVE AT LESS THAN 10 KNOTS.  DUE TO THE
LIGHT WINDS IT IS DIFFICULT TO DETERMINE A DIRECTION BUT ASH
MOVEMENT TOWARD THE WEST OR NORTHWEST SEEMS MOST LIKELY. 
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OUTLOOK: SEE SIGMETS 
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THIS WILL BE THE FINAL MESSAGE ON THIS EVENT.
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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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