FVXX21 KWBC 170830
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0830 UTC 17 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-258         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 INFRARED AND MULTISPECTRAL
IMAGERY...17/0000 UTC AVIATION MODEL WIND FORECAST...GEOPHYSICAL
INSTITUTE REPORT AND UPPER AIR DATA.
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ERUPTION DETAILS: NEW PUFF AT 17/0100 UTC.
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DETAILS OF ASH: THE PUFF THAT WAS OBSERVED IN SATELLITE IMAGERY AT
17/0100 UTC IS NO LONGER DISCERNIBLE IN SATELLITE IMAGERY. THE
ASH FROM THAT ERUPTION WAS ESTIMATED AS HIGH AS FL310 BASED ON UPPER
AIR SOUNDINGS.  THE ASH MOVED NORTHWESTWARD AND DISSIPATED.  
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT FL310 WOULD
MOVE NORTHWESTWARD AT 5 TO 10 KTS. ASH BELOW FL240 WOULD MOVE
SOUTHWEST AT 10 TO 15 KNOTS.
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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
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EFFECTIVE JANUARY 3 2000 AT 0000 UTC... ALL REFERENCES TO LATITUDE
AND LONGITUDE IN VOLCANIC ASH ADVISORY STATEMENTS WILL BE IN DEGREES
AND MINUTES OF A DEGREE.  EXAMPLE: 16.70N 62.20W  WILL BE 1642N6212W
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THE NEXT STATEMENT WILL BE ISSUED BY 17/1430 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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KARST/NOAA/NESDIS/SAB
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