FVXX20 KWBC 181615 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1615 UTC 18 May 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-067 MEXICO 19.0N 98.6W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . ...THIS IS NOT A TEST... . 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 REPORTS AN EXHALATION WITH POSSIBLE ASH TO FL200. THE ERUPTION IS NOT DETECTABLE IN SATELLITE IMAGERY THRU 18/1600 UTC. WE WILL CONTINUE TO MONITOR. . 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. . THE NEXT MESSAGE WILL BE ISSUED AT 18/2215 UTC. . THIS IS NOT A TEST...... . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN