FVXX21 KWBC 211415 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1415 UTC 21 MAR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-042 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL IMAGERY...MEXICO CITY MWO...SURFACE OBSERVATIONS FROM PUEBLA MEXICO . ERUPTION DETAILS: EXHALATION AT APPROXIMATELY 21/1335 UTC . DETAILS OF ASH CLOUD: THE MEXICO CITY MWO HAS ALERTED US OF ANOTHER EXHALATION OF ASH FROM THE POPOCATEPETL VOLCANO. MEXICO CITY INDICATED THAT THE ASH PLUME WAS APPROXIMATELY 800 M (2625 FT) ABOVE THE SUMMIT. A SURFACE OBSERVATION FROM PUEBLA AT 1340 UTC INDICATED ASH TO FL220. THE POPO CAMERA CONTINUES TO SHOW ASH VENTING AT 1410 UTC. . TRAJECTORY: MEXICO CITY AND PUEBLA BOTH NOTED A MOVEMENT TOWARD THE SOUTHEAST. . 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 FOLLOW WITHIN THE HOUR AFTER ADDITIONAL SATELLITE DATA HAS BEEN ANALYZED. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN