FVXX21 KWBC 010440 VOLCANIC ASH ADVISORY ISSUED: 2001JUN01/0440Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/66 . INFORMATION SOURCE: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...MEXICO CITY METEOROLOGICAL WATCH OFFICE...SIGMET... AVIATION MODEL . ERUPTION DETAILS: STEAM AND ASH EMISSION . DETAILS OF ASH CLOUD: THE MEXICO CITY METEOROLOGICAL WATCH OFFICE REPORTS THAT ASH TO FL250 WAS OBSERVED AT 01/0239Z ABOUT 20 NMI (37 KM) SOUTHEAST OF THE VOLCANO. ASH CANNOT BE OBSERVED IN SATELLITE IMAGERY THROUGH 0415Z POSSIBLY BECAUSE OF WEATHER CLOUDS SOUTH AND EAST OF THE VOLCANO. . TRAJECTORY: ASH BETWEEN FL180 AND FL250 IS REPORTED TO BE MOVING TO THE SOUTHEAST AND UPPER AIR PATTERNS SUGGEST THAT IT WOULD MOVE AT LESS THAN 10 KNOTS. . OUTLOOK: SEE SIGMETS. . THIE NEXT ADVISORY WILL BE ISSUED BY 01/1030Z. . 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