FVXX22 KWBC 241445 VOLCANIC ASH ADVISORY ISSUED: 2001JUL24/1445Z VAAC: WASHINGTON . VOLCANO: POPOCATEPETL 1401-09 LOCATION: 1901N 9837W AREA: MEXICO . SUMMIT ELEVATION: 17930 FT (5465 M) . ADVISORY NUMBER: 2001/87 . INFORMATION SOURCE: MEXICO CITY METEOROLOGICAL WATCH OFFICE. GOES-8 VISIBLE..MULTISPECTRAL AND INFRARED SATELLITE IMAGERY. MEXICO CITY UPPER AIR SOUNDING. SIX HOUR WIND FORECAST FROM THE 24/0600Z AVIATION MODEL. . ERUPTION DETAILS: ASH OBSERVED AT 24/1400Z. . DETAILS OF ASH CLOUD: THE MEXICO CITY MWO RECEIVED A PILOT REPORT OF ASH OVER THE SUMMIT AT 24/1400Z TO FL180 MOVING WEST. SATELLITE IMAGERY THROUGH 24/1415Z DOES NOT INDICATE ANY ASH HOWEVER CLOUDS IN THE AREA MIGHT BE HINDERING DETECTION OF THE ASH. . TRAJECTORY: WINDS AT FL180 ARE LIGHT AND VARIABLE SO EXPECT ASH TO CONTINUE TO DRIFT TO THE WEST OR POSSIBLY WEST-SOUTHWEST. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 24/2100Z. . 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. . WALTER/RUMINSKI . NNNN