FVXX21 KWBC 030730
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0730 UTC 03 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-198         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 MULTISPECTRAL AND INFRARED IMAGERY. 
AVIATION MODEL WIND FORECAST.
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ERUPTION DETAILS: CONTINUOUS STEAM AND ASH EMISSIONS AND OCCASIONAL
EXPLOSIONS OF ASH.
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DETAILS OF ASH: THE VOLCANO HAS UNDERGONE A RELATIVELY QUIET STAGE
IN THE PAST SEVERAL DAYS. NO ASH CAN BE SEEN IN SATELLITE IMAGERY
THROUGH 0645 UTC. THE VOLCANO REMAINS IN AN UNSTABLE STATE AND COULD
PRODUCE A MODERATE TO LARGE ERUPTION AT ANYTIME. 
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TRAJECTORY: UPPER AIR PATTERNS BASED ON NUMERICAL GUIDANCE SUGGEST
ANY ASH FROM THE SUMMIT UP TO FL300 WOULD MOVE SOUTHWEST AT 5 TO 10
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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HUGHES/NOAA/NESDIS/SAB
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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 03/1330 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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