FVXX20 KWBC 040100 VOLCANIC ASH ADVISORY ISSUED: 2001JUL04/0100Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/82. INFORMATION SOURCE: GOES-8 MULTISPECTRAL AND INFRARED SATELLITE IMAGERY. UPPER AIR OBSERVATION FROM MEXICO CITY. MEXICO CITY METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: EXHALATIONS WITH ASH AT 1148Z. . DETAILS OF ASH CLOUD: ASH FROM THE ERUPTION AT 1148Z DISSIPATED NORTHWEST OF THE VOLCANO AND CAN NO LONGER BE DETECTED IN SATELLITE IMAGERY. . TRAJECTORY: ANY ASH AT OR BELOW FL200 WILL MOVE TOWARDS THE NORTHWEST AT 5 TO 10 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THIS WILL BE THE LAST MESSAGE FOR 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. . KARST . NNNN