FVXX21 KWBC 081720 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1715 UTC 08 MAR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-011 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES-8 SATELLITE IMAGERY THROUGH 1645 UTC. SURFACE OBSERVATION FROM PUEBLA...UPPER AIR DATA FROM MEXICO CITY . ERUPTION DETAILS: UNKNOWN. . DETAILS OF ASH CLOUD: A SMALL AREA OF ASH COULD BE SEEN IN THE 1602 UTC SATELLITE IMAGE. SUBSEQUENT SATELLITE IMAGES SHOWED THE ASH MOVING TOWARD THE SOUTHEAST AND THEN DISSIPATING BY 1645 UTC. NO ASH CAN CURRENTLY BE DISCERNED IN IMAGERY. ASH IS ESTIMATED TO BE AT ABOUT FL220 BASED ON 1200 UTC UPPER AIR DATA FROM MEXICO CITY. A SURFACE OBSERVATION FROM PUEBLA NOTED LIGHT VOLCANIC ASH AT 1551 UTC MOVING SOUTHEAST. . TRAJECTORY: ASH WAS SEEN MOVING TOWARD THE SOUTHEAST AT ABOUT 13 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 MESSAGE WILL BE ISSUED AT 08/2315 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN