FVXX21 KWBC 121130 . VOLCANIC ASH ADVISORY ISSUED 1130 UTC 12 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-108 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED AND MULTISPECTRAL IMAGERY...U.S. NUMERICAL MODEL WINDS . ERUPTION DETAILS: CONTINUOUS VENTING OF ASH AND STEAM NOW AT LOWER LEVELS. A NEW EXPLOSION OCCURRED AT 0415 UTC. . DETAILS OF ASH: GOES-8 VISIBLE MULTISPECTRAL AND INFRARED IMAGERY THROUGH 1115 UTC INDICATED HIGH LEVEL METEOROLOGICAL CLOUDS OVER THE SUMMIT AND THE IMMEDIATE SURROUNDINGS PRECLUDING THE DETECTION OF ASH. THE EARLIER PLUME FROM THE 0415 UTC ERUPTION HAD BEEN ESTIMATED AT FL320 BUT WAS OVERRUN BY THE ADVANCING HIGH LEVEL CLOUDS FROM THE EAST. . TRAJECTORY: ANY ASH AT FL320 WOULD MOVE TOWARDS THE NORTHWEST AT 15 TO 20 KNOTS. . 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 AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 12/1730. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . TURK - NOAA/NESDIS/SAB . NNNN