FVXX23 KWBC 121720 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1720 UTC 12 NOV 1999 BY THE WASHINGTON VAAC . COLIMA 99-064 MEXICO 19.51N 103.62W . BACKGROUND: COLIMA MEXICO (1401-04) SUMMIT HEIGHT 13451 FT (4100 M) . SOURCES OF INFORMATION: MEXICO CITY METEOROLOGICAL WATCH OFFICE...COLIMA TOWER...GOES-8 VISIBLE SATELLITE IMAGERY...12 UTC GUADALAJARA UPPER AIR SOUNDING . ERUPTION DETAILS: ERUPTION OCCURRED AT 12/1637 UTC. . DETAILS OF ASH CLOUD: THE COLIMA TOWER REPORTED AN ERUPTION WITH AN ESTIMATED HEIGHT TO FL200 AND ASH MOVING TOWARD THE WEST. GOES-8 VISIBLE IMAGERY SHOWS ONLY A FAINT ASH CLOUD INDICATIVE OF A SHORT DURATION ERUPTION WITH A SMALL AMOUNT OF ASH MOVING TOWARD THE WEST. . TRAJECTORY: UPPER AIR PATTERNS INDICATE THAT ASH BELOW FL170 WOULD MOVE TO THE WEST OR NORTHWEST AT 5 TO 15 KNOTS. ANY ASH AT FL200 WOULD MOVE TOWARD THE NORTHEAST AT 10 TO 20 KNOTS. ASH BETWEEN FL170 AND FL200 WOULD MOVE IN A VARIABLE DIRECTION AT A SLOW SPEED. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS 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/) . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE SENT BY 12/2330 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . RUMINSKI . NNNN