FVXX21 KWBC 150530
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0520 UTC 15 DEC 1999 BY THE WASHINGTON VAAC 
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TUNGURAHUA 99-249       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...GEOPHYSICAL
INSTITUTE REPORT AND WIND DATA.
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ERUPTION DETAILS: ALMOST CONTINUAL STEAM EMISSIONS WITH OCCASIONAL
PULSES OF ASH.
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DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH
15/0445 UTC.  HOWEVER THE PRESENCE OF LOW LEVEL WEATHER CLOUDS MIGHT
BE HINDERING ASH DETECTION.  MOREOVER OCCASIONAL BRIEF PULSES OF ASH
AT ABOUT FL220 HAVE BEEN OBSERVED IN THE PAST 24 HOURS AND THIS ASH
MOVED TO THE WEST BEFORE DISSIPATING.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BELOW FL240
WOULD MOVE TO THE WEST 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
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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 15/1130 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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STREETT
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