FVXX22 WBC 161843 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1843 UTC 16 May 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-066 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: MEXICO CITY METEOROLOGICAL WATCH OFFICE...CENAPRED...PIREP...GOES-8 VISIBLE AND INFRARED IMAGERY. . ERUPTION DETAILS: LAST ERUPTION AT 16/1226 UTC. . DETAILS OF ASH CLOUD: ANY ASH FROM THE MORNING ERUPTION IS NOT DISCERNIBLE IN THE LATEST VISIBLE IMAGERY AT 1815 UTC. . TRAJECTORY: UPPER AIR DATA SUGGEST THAT ASH FROM FL180 TO FL210 WOULD MOVE TOWARD THE SOUTHWEST AT LESS THAN 20 KTS. . 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. . THIS IS THE LAST MESSAGE FOR THIS EVENT. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN