FVXX20 KWBC 271930 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1930 UTC 27 JAN 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-001 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: SIGMET FROM MEXICO CITY MWO...GOES 8 VISIBLE INFRAFRED AND MULTISPECTRAL IMAGERY....1200 UTC SOUNDING FROM MEXICO CITY...1800 UTC HIGH DENSITY SATELLITE WINDS . ERUPTION DETAILS: THE MEXICO CITY METEOROLOGICAL WATCH OFFICE REPORTS AN EXHALATION TO FL220 AT 27/1840 UTC. THE STEAM AND ASH IS MOVING NORTHWARD AT 10 TO 15 KTS. . DETAILS OF ASH CLOUD: SATELLITE IMAGERY DOES NOT INDICATE THE ERUPTION. THE SHORTWAVE IMAGERY SHOWS A HOTSPOT OVER THE VOLCANO. . TRAJECTORY: ASH BETWEEN FL180 AND FL220 WILL MOVE NORTH TO NORTHEAST AT 10 TO 15 KTS.. . 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 SENT AROUND 28/0130 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN