FVXX21 KWBC 130120  
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0120 UTC 13 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-240        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...U.S. NUMERICAL MODEL WIND FORECASTS.
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ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM WITH
OCCASIONAL LARGER PUFFS
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DETAILS OF ASH: NO ASH PLUME IS CURRENTLY VISIBLE IN SATELLITE
IMAGERY THROUGH 0045 UTC DUE TO CLOUDS IN THE VICINITY.  VISIBLE
IMAGERY THROUGH 2215 UTC DID SHOW A VERY NARROW LOW LEVEL PLUME
THROUGH BREAKS IN THE CLOUD COVER MOVING JUST NORTH OF DUE WEST. 
UPPER AIR MODEL FORECAST DATA WOULD PLACE THE PLUME BELOW FL200. 
MULTISPECTRAL IMAGERY HAS INDICATED OCCASIONAL HOT SPOTS OVER THE
PAST FEW HOURS.
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TRAJECTORY: ANY ASH BELOW FL200 WOULD MOVE WEST 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 AND VAFTAD.
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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 13/0730 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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