FVXX21 KWBC 250700
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0700 UTC 25 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-291         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...0000 UTC AVIATION MODEL DATA
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ERUPTION DETAILS: INTERMITTENT ASH AND STEAM EMISSIONS
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DETAILS OF ASH: NO ASH IS BEING DETECTED IN SATELLITE IMAGERY
THROUGH 25/0615 UTC. THERE ARE NO SURFACE REPORTS OF ANY ASH OR OF
ANY ERUPTIONS AT THIS TIME. HOWEVER THERE HAVE BEEN OCCASIONAL SMALL
EXPLOSIONS WHICH HAVE BEEN REPORTED BY THE GEOPHYSICAL INSTITUTE ON
AN ALMOST DAILY BASIS. WHEN THEY HAVE OCCURRED THEY HAVE TYPICALLY
SENT ASH AND STEAM TO BETWEEN FL180 AND FL230. 
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TRAJECTORY: ANY ASH AND STEAM BETWEEN FL180 AND FL230 SHOULD MOVE TO
THE NORTH-NORTHWEST AT ABOUT 10 TO 15 KNOTS. HOWEVER AT ABOUT FL230
THE WINDS ARE LIGHT AND VARIABLE.
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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 25/1300 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON
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NNNN