FVXX22 KWBC 111800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1800 UTC 11 NOV 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-104 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. 1200 UTC MEXICO CITY SOUNDING. MEXICO CITY MWO AND CENAPRED VOLCANO CAM. . ERUPTION DETAILS: THE MEXICO CITY MWO REPORTS A SMALL ERUPTION OF STEAM AND ASH AT 1725 UTC TO FL180. . DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 11/1732 UTC SHOWS CONSIDERABLE CLOUDINESS OVER THE AREA MAKING DETECTION OF ASH IMPOSSIBLE. HOWEVER..EARLIER IMAGERY DID SHOW A WELL DEFINED HOTSPOT ASSOCIATED WITH THE VOLCANO. . TRAJECTORY: UPPER AIR DATA FROM MEXICO CITY SUGGEST ASH AT FL180 WOULD MOVE TOWARD THE WEST-NORTHWEST AT 10KTS. . 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. . NEXT ADVISORY WILL BE ISSUED AROUND 12/0000 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . WALTER/SAB/NOAA/NESDIS . NNNN