FVXX20 KWBC 131000 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1000 UTC 13 MAR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-028 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 MULTISPECTRAL IMAGERY. . ERUPTION DETAILS: ANOTHER EMISSION AT APPROX 13/0318 UTC. . DETAILS OF ASH CLOUD: NO ASH CAN BE DETECTED IN GOES-8 MULTISPECTRAL IMAGERY SINCE THE 0318 UTC ERUPTION. HOWEVER WE WILL CONTINUE TO MONITOR SINCE POPOCATEPETL HAS BEEN PRODUCING SMALL EMISSIONS FOR THE PAST SEVERAL DAYS. . TRAJECTORY: N/A. . 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 BY 13/1600 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN