FVXX20 KWBC 061630 VOLCANIC ASH ADVISORY ISSUED 1630 UTC 06 JUL 2000 BY THE WASHINGTON VAAC . POPOCATEPETL 00-039 MEXICO 1901N 9837W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: MEXICO CITY METEOROLOGICAL WATCH OFFICE...POPO CAM...AVIATION MODEL WINDS...GOES 8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY . ERUPTION DETAILS: EMISSIONS OF STEAM AND ASH AT 06/1503 UTC AND O6/1506 UTC . DETAILS OF ASH CLOUD: EMISSIONS OF STEAM AND ASH TO FL220 WERE REPORTED BY THE MEXICO CITY MWO. NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 1615 UTC. THE INABILITY TO DETECT ASH IN IMAGERY IS DUE EITHER TO THE ASH BEING TOO DIFFUSE OR THE ASH BEING OBSCURED BY SCATTERED WEATHER CLOUDS WEST OF THE VOLCANO. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ASH AT ABOUT FL220 WOULD MOVE WEST OR NORTHWEST AT ABOUT 10 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 16/2230 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER 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