FVXX20 KWBC 181315
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1305 UTC 18 JULY 1999 BY THE WASHINGTON VAAC 
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COLIMA 99-042  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 INFRARED AND MULTISPECTRAL IMAGERY
THROUGH 18/1245 UTC. VAFTAD.  MEXICO CITY METEOROLOGICAL WATCH OFFICE
SIGMET.  1200Z MANZANILLO RADIOSONDE.

ERUPTION DETAILS:  ERUPTION OCCURRED AT ABOUT 17/1742 UTC. 
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DETAILS OF ASH CLOUD: METEOROLOGICAL CLOUDS CONTINUE TO COVER THE AREA
AROUND THE VOLCANO PREVENTING ASH DETECTION IN SATELLITE IMAGERY. THE
MEXICO CITY MWO SIGMET INDICATES ASH TO FL350 EXTENDING TO THE
SOUTHWEST OF THE VOLCANO.  THE VAFTAD INDICATES THAT THE LIKELY
LOCATION OF ANY ASH IS TO THE WEST OF THE VOLCANO WITH LOWER AND MID
LEVEL ASH TO THE WEST AND SOUTHWEST AND HIGH LEVEL ASH TO THE WEST
NORTHWEST.  THE VAFTAD INDICATES THAT THE AREA OF ASH MIGHT NOW EXTEND
FROM THE VOLCANO TO THE WEST COAST OF MEXICO AND THEN CONTINUE FOR
ABOUT 125 NMI (232 KM) OVER THE PACIFIC OCEAN. ALL ASH IN THE VAFTAD
DEPICTION IS BETWEEN 17N AND 21N. 
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT MOST ASH WOULD MOVE TO THE 
WEST OR SOUTHWEST.  ANY ASH THAT MIGHT BE PRESENT ABOVE ABOUT FL350
WOULD MOVE TO THE WEST AND WEST NORTHWEST.   ASH SPEED WOULD BE LESS
THAN 20 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 AND VAFTAD.
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THE NEXT STATEMENT WILL BE ISSUED BY 18/1915 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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