FVXX21 KWBC 131920
VOLCANIC ASH ADVISORY  
ISSUED 1920 UTC 13 JUN 2000 BY THE WASHINGTON VAAC 
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TUNGURAHUA 00-693      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. WIND FORECAST FROM THE AVIATION MODEL.
GEOPHYSICAL INSTITUTE REPORT. SIGMETS FROM GUAYAQUIL
METEOROLOGICAL WATCH OFFICE.
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ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS.  
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DETAILS OF ASH: SATELLITE IMAGERY THROUGH 13/1815 UTC SHOWED
TWO ASH EMISSIONS FROM THE VOLCANO AT ABOUT 1615 UTC AND 1715
UTC. ASH PLUMES BECAME MORE APPARENT IN MULTISPECTRAL IMAGERY
AS WATER VAPOR WITHIN THE PLUMES DISSIPATED DOWNWIND OF THE
SUMMIT. 
THE LEADING EDGE OF THE FIRST ASH AREA IS 110 KM (59 NMI) FROM
THE SUMMIT BETWEEN POINTS 0105S 7926W AND 0133S 7922W AND IS
AROUND 22KM (12 NMI) WIDE. THE SECOND ASH AREAS LEADING EDGE
IS LOCATED 70 KM (38 NMI) FROM THE SUMMIT BETWEEN POINTS 0117S
7857W AND 0138S 7858W AND IS 22 KM (12 NMI) WIDE. BOTH ASH
AREAS ARE ESTIMATED AROUND FL270 AND ARE MOVING TOWARD THE
WEST AT 25 KNOTS.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN
THE SUMMIT AND FL270 WOULD MOVE TOWARD THE WEST AT ABOUT 25
KNOTS.
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OUTLOOK: SEE SIGMETS AND VAFTAD.
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THE NEXT MESSAGE WILL BE ISSUED BY 14/0115 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/SWANSON
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NNNN"Attached Graphic Map Depicting Ash" 

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