FVXX20 KWBC 182230 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2230 UTC 18 May 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-068 MEXICO 19.0N 98.6W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . . SOURCES OF INFORMATION: MEXICO CITY METEOROLOGICAL WATCH OFFICE...GOES-8 VISIBLE AND MULTISPECTRAL IMAGERY...CENAPRED HOMEPAGE . ERUPTION DETAILS: EXHALATION AT 18/1530 UTC . DETAILS OF ASH CLOUD: THE MEXICO CITY WATCH OFFICE REPORTED AN EXHALATION WITH POSSIBLE ASH TO FL200. NO ASH WAS DETECTABLE IN SATELLITE IMAGERY THRU 18/2215 UTC. . TRAJECTORY: ASH AT ABOUT FL200 WILL MOVE SOUTH AT 15 TO 20KTS. . 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/messages.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . THIS IS THE LAST MESSAGE ON THIS EVENT.. . . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN