FVXX21 KWBC 240200 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0220 UTC 24 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-023 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY ...GEOPHYSICAL INSTITUTE...U.S. NATIONAL WEATHER SERVICE NUMERICAL WEATHER PREDICTION MODELS . ERUPTION DETAILS: CONTINUOUS VENTING OF ASH AND STEAM. . DETAILS OF ASH: THE LATEST GOES-8 SATELLITE IMAGERY AT 0115 UTC SHOWS DENSE MULTILAYERED CLOUDS OVER THE VOLCANO MAKING IT DIFFICULT TO DETECT ANY ASH. THE LATEST SIGMET FROM THE GUAYAQUIL MWO REPORTED ASH OVER THE VOLCANO TO A HEIGHT OF FL220. THE GEOPHYSICAL INSTITUTE CONTINUES TO REPORT THAT SEISMIC ACTIVITY REMAINS HIGH AND IT IS LIKELY THAT THE VOLCANO WILL CONTINUE TO VENT ASH AND GASES. . TRAJECTORY: NUMERICAL MODEL FORECASTS VALID AT 24/0000 UTC SUGGEST THAT ANY ASH FROM THE SUMMIT TO FL220 WILL MOVE TOWARD THE WEST OR POSSIBLY NORTHWEST AT 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. . THE NEXT MESSAGE WILL BE ISSUED AROUND 24/0800 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . BROWN . NNNN