FVXX20 KWBC 151555 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1555 UTC 15 JUNE 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-077 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: MEXICO CITY MWO...PILOT REPORT...CENAPRED...GOES-8 VISIBLE AND MULTISPECTRAL IMAGERY . ERUPTION DETAILS: ERUPTION AROUND 15/1428 UTC . DETAILS OF ASH CLOUD: THE MEXICO CITY MWO HAS REPORTED AN ERUPTION WITH ASH REPORTED BETWEEN FL180 AND FL240. GOES-8 VISIBLE IMAGERY INDICATES AN ABUNDANCE OF METEOROLOGICAL CLOUDS IN THE VICINITY OF THE VOLCANO HOWEVER NO ASH IS DISCERNABLE. MULTISPECTRAL IMAGERY DOES NOT VERIFY THE PRESENCE OF ASH EITHER. THUS ANY CURRENT ASH CLOUD IS MIXED WITHIN THE SURROUNDING METEOROLOGICAL CLOUD ENVIRONMENT. CAUTION IS RECOMMENDED. . TRAJECTORY: ANY ASH BETWEEN FL180 AND FL240 WILL MOVE WEST TO SOUTHWEST AT ABOUT 5-10 KNOTS. . 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 BY 15/2200 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN