FVXX21 KWBC 211715 VOLCANIC ASH ADVISORY ISSUED 1715 UTC 21 NOV 2000 BY THE WASHINGTON VAAC . POPOCATEPETL 00-123 MEXICO 1901N 9837W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. AVIATION MODEL WIND FORECAST. MEXICO CITY METEOROLOGICAL WATCH OFFICE SIGMET . ERUPTION DETAILS: STEAM AND POSSIBLE ASH EXHALATIONS AT 1019 UTC AND 1021 UTC AND 1100 UTC. . DETAILS OF ASH CLOUD: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 21/1702 UTC BUT IT IS POSSIBLE THAT WEATHER CLOUDS ARE HINDERING ASH DETECTION. BETWEEN 21/1000 UTC AND 21/1100 UTC THE MEXICO CITY METEOROLOGICAL WATCH OFFICE REPORTED THREE EXHALATIONS WITH POSSIBLE ASH BETWEEN FL170 AND FL220. . TRAJECTORY: IF THERE IS ANY ASH PRESENT BETWEEN SUMMIT LEVEL AND FL220 IT WOULD MOVE AT LESS THAN 10 KNOTS. DUE TO THE LIGHT WINDS IT IS DIFFICULT TO DETERMINE A DIRECTION BUT ASH MOVEMENT TOWARD THE WEST OR NORTHWEST SEEMS MOST LIKELY. . OUTLOOK: SEE SIGMETS . THIS WILL BE THE FINAL MESSAGE ON THIS EVENT. . 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. . NNNN