FVXX20 KWBC 181900
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1900 UTC 18 JULY 1999 BY THE WASHINGTON VAAC 
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COLIMA 99-043  MEXICO 19.51N 103.62W 
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BACKGROUND:    COLIMA MEXICO (1401-04)
               SUMMIT HEIGHT 13451 FT (4100 M)
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SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL
IMAGERY THROUGH 18/1815 UTC.  VAFTAD.  MEXICO CITY METEOROLOGICAL
WATCH OFFICE COORDINATION. MEXICO CITY SIGMET.  1200Z MANZANILLO
RADIOSONDE.

ERUPTION DETAILS:  ERUPTION OCCURRED AT ABOUT 17/1742 UTC. SMALLER
EXHALATIONS ON THE MORNING OF JULY 18.
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DETAILS OF ASH CLOUD:   THE MEXICO CITY METEOROLOGICAL WATCH OFFICE
REPORTS THAT THEY WERE INFORMED BY THE COLIMA TOWER THAT EXHALATIONS
HAD OCCURRED THIS MORNING. HOWEVER NO ASH CAN BE SEEN IN SATELLITE
IMAGERY THROUGH 1845 UTC. THUNDERSTORMS OVER THE VOLCANO AND WEST OF
THE VOLCANO MIGHT BE OBSCURING SOME ASH PARTICULARLY ANY ASH NEAR OR
SLIGHTLY WEST OF THE SUMMIT.  A MEXICO CITY SIGMET INDICATES ASH CLOSE
TO THE SUMMIT AND EXTENDING TO THE SOUTHWEST BETWEEN FL130 AND FL200. 
THE AREA ALONG THE COAST AND OVER THE OCEAN THAT HAD PREVIOUSLY BEEN
SUSPECTED OF HAVING ASH COVERED BY CLOUDS IS NOW RELATIVELY CLOUD FREE
AND NO ASH CAN BE SEEN. 
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BELOW FL280 WOULD
MOVE TO THE WEST OR SOUTHWEST AT LESS THAN 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
www.ssd.noaa.gov/VAAC/washington.html
(all lower case except /VAAC/)
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OUTLOOK:  SEE LATEST SIGMETS.
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THE NEXT STATEMENT WILL BE ISSUED BY 19/0100 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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