FVXX20 KWBC 180115 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0115 UTC 18 JULY 1999 BY THE WASHINGTON VAAC . COLIMA 99-040 MEXICO 19.51N 103.62W . BACKGROUND: COLIMA MEXICO (1401-04) SUMMIT HEIGHT 13451 FT (4100 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY...1200 UTC MANZANILLO RADIOSONDE ERUPTION DETAILS: ERUPTION OCCURRED AT ABOUT 17/1742 UTC. . DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 0045 UTC SHOWS THE DEVELOPMENT OF STRONG THUNDERSTORMS IN THE VICINITY OF THE VOLCANO. THESE THUNDERSTORMS AND THE ASSOCIATED CIRRUS CLOUDS ARE OBSCURING ANY DETECTION OF ASH. . TRAJECTORY: WEST AT LESS THAN 10 KNOTS. SOME ASH IS MOVING TO THE NORTHWEST AT LESS THAN 15 KNOTS. . 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/) . OUTLOOK: SEE LATEST SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 18/0715 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN