FVXX20 KWBC 032100 VOLCANIC ASH ADVISORY ISSUED: 2001JUL03/2100Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/81. INFORMATION SOURCE: GOES-8 MULTISPECTRAL AND INFRARED SATELLITE IMAGERY. UPPER AIR OBSERVATION FROM MEXICO CITY. UPPER AIR FORECAST VALID 1200Z. MEXICO CITY METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: EXHALATIONS WITH ASH AT 1148Z. . DETAILS OF ASH CLOUD: ASH FROM THE ERUPTION AT 1148Z CAN NO LONGER BE DETECTED IN SATELLITE IMAGERY THROUGH 2002Z. THE ASH MOVED TO THE NORTHWEST AT AN ESTIMATED HEIGHT OF FL170 AND A SPEED OF 5 TO 10 KTS. ASH WAS OBSERVED FALLING ON THE RUNWAYS AT MEXICO CITY AIRPORT EARLIER TODAY. . TRAJECTORY: ANY ASH AT OR BELOW FL200 WILL MOVE TOWARDS THE NORTHWEST AT 5 TO 10 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT ADVISORY WILL BE ISSUED BY 04/0300Z. . 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