FVXX21 KWBC 200230 VOLCANIC ASH ADVISORY ISSUED 0230 UTC 20 SEP 2000 BY THE WASHINGTON VAAC . POPOCATEPETL 00-073 MEXICO 1901N 9837W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. MEXICO CITY METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: SERIES OF EXHALATIONS TO UNKNOWN HEIGHT. . DETAILS OF ASH: THE MEXICO CITY METEOROLOGICAL WATCH OFFICE HAD REPORTED A SERIES OF EXHALATIONS THAT MIGHT HAVE PRODUCED ASH TO AN UNKNOWN HEIGHT. DUE TO DENSE CLOUDS OVER THE VOLCANO NO ASH CAN BE SEEN IN GOES-8 IMAGERY THROUGH 0145 UTC. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT NEAR SUMMIT LEVEL WOULD MOVE TOWARD THE NORTH AT ABOUT 10 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE SENT AT 20/0830 UTC. . 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