FVXX20 KWBC 152040 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2040 UTC 15 APR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-063 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: MEXICO CITY MWO... . ERUPTION DETAILS: INITIAL ERUPTION AT 15/1557 UTC. . DETAILS OF ASH CLOUD: NO ASH CLOUD IS DISCERNABLE ON VISIBLE INFRARED OR MULTISPECTRAL IMAGERY THROUGH 2015 UTC. MEXICO CITY MWO REPORTS ASH BETWEEN FL180 AND FL260. . TRAJECTORY: ENE AT 10 KTS. WE WILL UPDATE THIS VAAS SHORTLY AS MORE INFORMATION COMES AVAILABLE. . 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 AND VAFTAD. . NEXT MESSAGE WILL BE ISSUED BY 15/2200. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN