FVXX21 KWBC 230110
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0110 UTC 23 NOV 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-154         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...
THE GEOFISICO INSTITUTO...1800 UTC AVIATION MODEL UPPER-AIR SOUNDING
DATA...
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ERUPTION DETAILS: CONTINUOUS ASH AND GAS EMISSIONS...AND OCCASIONAL
EXPLOSIONS AS REPORTED BY THE GEOFISICO INSTITUTO.
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DETAILS OF ASH: THE LATEST DAILY REPORT ISSUED BY THE GEOFISCO
INSTITUTO INDICATES STRONG VOLCANIC ACTIVITY AT TUNGURAHUA. HEAVY
AMOUNTS ASH AND VARIOUS GASES ARE BEING CONTINOUSLY RELEASED AND THE
ASH BUILD UP IS NOTED TO BE SIGNIFICANT AROUND THE VOLCANO ITSELF.
NUMEROUS EXPLOSIONS HAVE ALSO BEEN REPORTED BUT WITH MOST OF THEM
REPORTED TO BE SMALL IN MAGNITUDE. ASH IS CURRENTLY ESTIMATED TO BE
REACHING FL260 WITH OCCASIONAL PLUMES TO FL350 IN THE STRONGER
EXPLOSIONS. SATELLITE IMAGERY THROUGH 22/2345 UTC SHOWS A SOLID
OVERCAST OVER THE VOLCANO AND THROUGHOUT MUCH OF ECUADOR DUE TO
STRONG THUNDERSTORM ACTIVITY OVER THE MOUNTAIN RIDGES. NO ASH IS
DETECTED AT THIS TIME HOWEVER IT IS STRONGLY BELIEVED THAT ASH MAY
BE EMBEDDED WITHIN THE VARIOUS CLOUD DECKS OVER AND ADJACENT TO THE
VOLCANO SITE. EXTREME CAUTION IS ADVISED.
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TRAJECTORY: ASH IS EXPECTED TO MOVE SOUTH AT 10 TO 15 KNOTS UP TO
FL300 WITH A WEST TO SOUTHWEST HEADING OF 15 KNOTS ABOVE TO FL350.
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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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THE NEXT STATEMENT WILL BE ISSUED BY 23/0700 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON
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