FVXX21 KWBC 201325 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1325 UTC 20 SEPTEMBER 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-092 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: MEXICO CITY MWO...GOES 8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. . ERUPTION DETAILS: ERUPTION AT 20/1258 UTC. . DETAILS OF ASH CLOUD: THE MEXICO CITY METEOROLOGICAL WATCH OFFICE (MWO) HAS INDICATED A MODERATE ERUPTION OF POPOCATEPETL. AN EMISSION OF STEAM AND ASH WAS REPORTED TO FL210 BY THE MWO SHORTLY AFTER THE ERUPTION. THE ASH AND STEAM CAN JUST NOW BE SEEN AS OF 20/1302 UTC ON GOES 8 VISIBLE SATELLITE IMAGERY WITH A GENERAL MOVEMENT TO THE WEST OR SLIGHTLY SOUTH OF WEST. . TRAJECTORY: WEST-SOUTHWEST AT 10 TO 15 KNOTS. . REAL TIME SATELLITE IMAGERY ALONG WITH 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/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE LATEST SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 20/1930 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN