FVXX20 KWBC 180800 VOLCANIC ASH ADVISORY ISSUED: 2000DEC18/0800Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2000/191 INFORMATION SOURCE: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. 6 HOUR WIND FORECAST FROM THE 19/0000Z AVIATION MODEL. . ERUPTION DETAILS: ERUPTION BEGAN ABOUT 17/1250Z . DETAILS OF ASH CLOUD: ASH IS NO LONGER SEEN IN THE SATELLITE IMAGERY THROUGH 18/0715Z DUE TO THE FACT THAT HIGH LEVEL CIRRUS CLOUDS HAVE MOVED OVER THE AREA. THE PLUME WAS LAST OBSERVED AROUND 18/0400Z. IN ADDITION A WELL DEFINED HOTSPOT CONTINUES TO BE SEEN ON THE MULTISPECTRAL IMAGERY. . TRAJECTORY: ASH FROM THE SUMMIT TO FL250 WOULD MOVE SOUTH SOUTHWEST AT ABOUT 10 KNOTS. ASH TO FL300 WOULD MOVE TOWARD THE NORTHEAST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT MESSAGE WILL BE ISSUED BY 18/1400Z. . REAL TIME SATELLITE IMAGERY AND VOLCANIC ASH ADVISORIES OFTEN ACCOMPANIED BY A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS HTTP://WWW.SSD.NOAA.GOV/VAAC/WASHINGTON.HTML (ALL LOWER CASE EXCEPT /VAAC/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . WALTER . NNNN