FVXX20 KWBC 121700 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1700 UTC 12 MAR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-023 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: METEOROLOGICAL WATCH OFFICE IN MEXICO CITY...GOES-8 IMAGERY...POPO CAMERA . ERUPTION DETAILS: APPROXIMATELY 12/1552 UTC. . DETAILS OF ASH CLOUD: THE 1552 UTC SHORT-DURATION EXHALATION OF ASH RESULTED IN A FAINT ASH CLOUD THAT DISSIPATED NEAR 19.1N 98.4W AT 1632 UTC. THE CLOUD TOP WAS ESTIMATED AT FL240. A CAMERA OBSERVING THE SUMMIT INDICATED A MINOR STEAM PLUME EMANATING FROM THE VOLCANO AT 1653 UTC. . TRAJECTORY: ANY REMAINING DIFFUSE ASH WOULD MOVE TOWARD THE EAST NORTHEAST AT 20 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 VAFTAD AND SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED AT 12/2300. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN