FVXX21 KWBC 201900  
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1900 UTC 20 APR 2000 BY THE WASHINGTON VAAC 
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TUNGURAHUA 00-466         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...INFRARED AND
MULTISPECTRAL IMAGERY. 20/1800 UTC UPPER WIND FORECAST FROM
THE 20/1200 UTC AVN MODEL. THE GEOPHYSICAL INSTITUTE IN QUITO.
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ERUPTION DETAILS: OCCASIONAL ASH EMISSIONS.
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DETAILS OF ASH: GOES-8 IMAGERY THROUGH 1815 UTC CONTINUE TO
SHOW LOW AND MID LEVEL CLOUDS OVER THE AREA MAKING ASH
DETECTION DIFFICULT. TUNGURAHUA REMAINS IN A VERY ACTIVE STATE
AND COULD PRODUCE AN ASH EMISSION AT ANYTIME. THE GEOPHYSICAL
INSTITUTE REPORTS THAT SEISMICITY IN THE VOLCANO HAS BEEN LOW.
GOES-8 WILL BE IN RAPID SCAN MODE UNTIL 21/0326 UTC.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH UP TO FL300
WOULD MOVE WEST SOUTHWEST AT 10 TO 15 KNOTS.
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THE NEXT STATEMENT WILL BE ISSUED BY 21/0100 UTC.
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REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC
ASH ADVISORY STATEMENTS 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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HUGHES
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