FVXX21 KWBC 121400  
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VOLCANIC ASH ADVISORY STATEMENT CORRECTION TO NEXT MESSAGE TIME
ISSUED 1400 UTC 12 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-238        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...U.S. NUMERICAL MODEL WIND FORECASTS...WIND DATA FROM THE
INSTITUTO GEOFISICO
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ERUPTION DETAILS: CONTINUOUS EMISSION OF ASH AND STEAM WITH
OCCASIONAL LARGER PUFFS
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DETAILS OF ASH: A THIN FAINT ASH PLUME CAN BE SEEN IN SATELLITE
IMAGERY THROUGH 1315 UTC.  THE PLUME EXTENDS FROM THE SUMMIT TOWARD
THE WEST NORTHWEST REACHING THE POINT 1.3S 79.1W.  THE OBSERVABLE
PLUME IS 80 KM (43 NMI) LONG AND ABOUT 15 KM (8 NMI) WIDE.  HOWEVER
THE PLUME MIGHT ACTUALLY BE LARGER SINCE DENSE WEATHER CLOUDS IN THE
AREA MIGHT BE PARTLY OBSCURING THE PLUME OR OTHER NEARBY ASH. THE
HEIGHT OF THE PLUME IS ABOUT FL200.
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TRAJECTORY: ASH IS MOVING TOWARDS THE WEST NORTHWEST AT ABOUT 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 12/2000 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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NNNN
"Attached Graphic Map Depicting Ash" 

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