FVXX21 KWBC 211800
VOLCANIC ASH ADVISORY
ISSUED 1750 UTC 21 JUL 2000 BY THE WASHINGTON VAAC 
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TUNGURAHUA 00-852         ECUADOR 0128S 7826W 
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BACKGROUND:    TUNGURAHUA ECUADOR (1502-08)
               SUMMIT HEIGHT 16480 FT (5023 M)
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SOURCES OF INFORMATION: GOES-8 VISIBLE AND INFRARED AND
MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVIATION MODEL.
SIGMET FROM THE GUAYAQUIL METEOROLOGICAL WATCH OFFICE.
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ERUPTION DETAILS: GASES WITH OCCASIONAL ASH EMISSIONS.  
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DETAILS OF ASH:   A SIGMET FROM GUAYAQUIL MWO NOTES THAT AT
1655 UTC ONE PILOT OBSERVED ASH UP TO FL240 AND ANOTHER
OBSERVED ASH TO FL220.  SATELLITE IMAGERY THROUGH 21/1715 UTC
SHOWS LOW AND MID LEVEL CLOUDINESS IN THE VICINITY OF THE
VOLCANO MAKING IT DIFFICULT TO DETECT ASH.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN
THE SUMMIT AND FL240 WOULD MOVE TO THE WEST AT 10 TO 15 KTS.
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OUTLOOK: SEE SIGMETS.
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THE NEXT MESSAGE WILL BE ISSUED BY 22/0000 UTC.
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REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER 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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