FVXX21 KWBC 282145
VOLCANIC ASH ADVISORY  
ISSUED 2145 UTC 28 JUN 2000 BY THE WASHINGTON VAAC 
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TUNGURAHUA 00-757         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. THE GEOPHYSICAL INSTITUTE IN QUITO.
RIOBAMBA SURFACE STATION REPORT. WINDS FORECAST FROM THE
AVIATION MODEL
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ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS.  
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DETAILS OF ASH: SATELLITE IMAGERY THROUGH 28/2045 UTC SHOWED
AN ASH EMISSION FROM THE VOLCANO. THE GEOPHYSICAL INSTITUTE
CONFIRMED THAT AN EXPLOSION OCCURRED AT 2006 UTC AND AN ASH
COLUMN WAS PRODUCED. A SURFACE REPORT FROM RIOBAMBA ESTIMATED
THE ASH TO FL280.
THE ASH BECAME MORE APPARENT IN MULTISPECTRAL IMAGERY AT 2045
AS WATER VAPOR WITHIN THE PLUME DISSIPATED DOWNWIND OF THE
SUMMIT. THE LEADING EDGE OF THE ASH PLUME IS 23 KM (12 NMI)
WEST FROM THE SUMMIT AND IS 11 KM (6 NMI) WIDE.  ASH IS
ESTIMATED AT FL280 AND IS MOVING WEST AT 15 TO 20 KNOTS. 
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TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL280 WOULD MOVE WEST
AT 15 TO 20 KNOTS.
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OUTLOOK: SEE SIGMETS AND VAFTAD.
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THE NEXT MESSAGE WILL BE ISSUED BY 29/0400 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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CLARK
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NNNN"Attached Graphic Map Depicting Ash" 

"Graphic Map Depicting Ash"