FVXX21 KWBC 212130 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2130 UTC 21 MAR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-045 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND MULTISPECTRAL IMAGERY...POPO CAMERA. . ERUPTION DETAILS: ASH VENTING BEGINNING AT APPROXIMATELY 21/1335 UTC . DETAILS OF ASH CLOUD: SATELLITE IMAGERY AS OF 2102 UTC NO LONGER DETECTS ANY ASH THAT WAS BEING FOLLOWED FROM THIS MORNINGS 30 MINUTE ERUPTION. THERE HAVE ALSO BEEN NO FURTHER REPORTS OF ACTIVITY FROM THE VOLCANO OBSERVATORY. THE CLOUD BECAME TO FAINT TO FOLLOW JUST AFTER 1815Z WHEN IT WAS STILL FAINTLY SEEN BETWEEN POINTS 17.8N 97.6W AND 18.3N 97.4W AND WAS AROUND 30KM (16 NMI) WIDE. THIS WAS ROUGHLY 160 KM (86 NMI) SOUTHEAST OF THE VOLCANO AND WAS ESTIMATED AROUND FL220. . TRAJECTORY: TOWARD THE SOUTHEAST AROUND 25 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 STATEMENT WILL BE ISSUED AROUND 22/0130 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN