FVXX20 KWBC 181900 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1900 UTC 18 JULY 1999 BY THE WASHINGTON VAAC . COLIMA 99-043 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 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. . 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. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BELOW FL280 WOULD MOVE TO THE WEST OR SOUTHWEST 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. . THE NEXT STATEMENT WILL BE ISSUED BY 19/0100 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN