FVXX20 KWBC 211800 VOLCANIC ASH ADVISORY ISSUED: 2001NOV21/1800Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/103 . INFORMATION SOURCE: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. MEXICO CITY MET WATCH OFFICE. AVIATION MODEL WIND FORECAST. . ERUPTION DETAILS: EXHALATION AT 21/1732Z . DETAILS OF ASH CLOUD: THE MEXICO CITY MET WATCH OFFICE REPORTS AN EXHALATION OF THE VOLCANO. THEY COULD NOT ESTIMATE A HEIGHT OF THE EXHALATION DUE TO EXTENSIVE CLOUDS OVER THE REGION. IN ADDITION SATELLITE IMAGERY THROUGH 1745Z DOES NOT INDICATE ASH. . TRAJECTORY: ANY ASH AT NEAR SUMMIT LEVEL WILL MOVE TOWARDS THE EAST AT 35 TO 40 KTS. . OUTLOOK: SEE SIGMETS. . THIS WILL BE THE ONLY MESSAGE FOR THIS EVENT. . INTERNET URLS... MESSAGE LISTSERV WWW.SSD.NOAA.GOV/VAAC/SUBSCRIBE.HTML MESSAGES GRAPHICS AND IMAGERY WWW.SSD.NOAA.GOV/VAAC/WASHINGTON.HTML (ALL LOWERCASE EXCEPT /VAAC/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . KARST/WALTER . NNNN