FVXX21 KWBC 151955
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1955 UTC 15 NOV 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-123         ECUADOR 1.47S 78.44W 
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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...1200 UTC AVIATION MODEL UPPER-AIR DATA.
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ERUPTION DETAILS: CONTINUOUS ASH EMISSIONS....OCCASIONAL EXPLOSIONS
AND RELEASE OF THICKER ASH NOTED.
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DETAILS OF ASH: GOES 8 SATELLITE IMAGERY THROUGH 1845 UTC SHOWS A
LARGE ASH CLOUD BEING PRODUCED BY TUNGURAHUA. SATELLITE IMAGERY AND
UPPER-AIR DATA SUGGEST THAT THE ASH OVER THE LAST SEVERAL HOURS HAS
REACHED A MUCH HIGHER ALTITUDE AND IS THICK IN CONCENTRATION DUE TO
SOME POSSIBLE EXPLOSIONS. IT IS NOW ESTIMATED TO BE REACHING FL400.
THE ASH IS EMBEDDED WITHIN A RATHER DEEP LAYER OF THE TROPOSPHERE
AND THEREFORE HAS MULTIDIRECTIONAL MOVEMENT. ASH BETWEEN THE SUMMIT
AND FL300 HAS REACHED A DISTANCE OF 171 KM (92 NMI) TO THE NORTHWEST
OF THE SUMMIT AND IS 114 KM (62 NMI) WIDE. THICK ASH IS NOTED
BETWEEN FL300 AND FL400 AND IS EXTENDING 174 KM (94 NMI) TO THE
WEST-NORTHWEST OF THE SUMMIT AND IS 46 KM (25 NMI) WIDE.
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TRAJECTORY: ASH BETWEEN THE SUMMIT AND FL300 IS MOVING TO THE
NORTHWEST AND NORTH-NORTHWEST AT 10 TO 20 KNOTS. ASH FROM FL300 TO
FL400 IS MOVING MUCH FASTER TO THE WEST-NORTHWEST AT 20 TO 45 KNOTS
WHERE 45 KNOTS IS SEEN AT FL400.
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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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OUTLOOK:  SEE SIGMETS AND VAFTAD.
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THE NEXT STATEMENT WILL BE ISSUED BY 16/0200 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON/STREET/KARST
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NNNN"Attached Graphic Map Depicting Ash" 

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