FVXX20 KWBC 171915
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1915 UTC 17 JULY 1999 BY THE WASHINGTON VAAC 
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COLIMA 99-039  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: MEXICO CITY METEOROLOGICAL WATCH
OFFICE...GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY...1200 UTC 
MANZANILLO RADIOSONDE

ERUPTION DETAILS:  ERUPTION OCCURRED AT ABOUT 17/1742 UTC. 
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DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 1845 UTC SHOWS AN 
ERUPTION WITH ASH MOVING TO THE WEST.  A DEFINITIVE ASH BOUNDARY
CANNOT BE DETERMINED BECAUSE OF THUNDERSTORMS IN THE AREA BUT AT 1845
UTC THE ASH SEEMS TO EXTEND 37 KM (20NMI) FROM 19.4N 103.7W TO 19.7N
103.7W.  THE ASH IS APPRXOIMATELY 27 KM (15 NMI) WIDE. AN ASH HEIGHT
IS ALSO DIFFICULT TO DETERMINE BUT THE METEOROLOGICAL WATCH OFFICE
ESTIMATES THAT THE ASH IS BELOW FL350. SATELLITE ANALYSIS SUGGESTS
THAT THE ASH IS BELOW FL420.
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TRAJECTORY: WEST AT LESS THAN 10 KNOTS.  SOME ASH IS MOVING TO THE
NORTHWEST 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 AND VAFTAD.
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THE NEXT STATEMENT WILL BE ISSUED BY 18/0115 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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NNNN
"Attached Graphic Map Depicting Ash" 

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