FVXX21 KWBC 230200 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0200 UTC 23 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-019 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 GEOPHYSICAL INSTITUTE IN ITS DAILY REPORT ON THE VOLCANO INDICATED A CONTINUOUS VENTING OF ASH AND GASES. SEISMIC ACTIVITY HAS ALSO BEEN CONTINUOUS AT HIGH LEVELS. EARLY YESTERDAY (0900 LOCAL) PILOTS REPORTED THE ERUPTING COLUMN AT NEARLY FL230. BASED ON THE INSTITUTES REPORT AN ASH PLUME IS ASSUMED TO BE PRESENT EVEN THOUGH UNDETECTABLE IN SATELLITE IMAGERY THROUGH 0115 UTC DUE TO EXTENSIVE HIGH AND MID LEVEL CLOUDS. . TRAJECTORY: NUMERICAL MODEL FORECASTS VALID AT 23/0000 UTC SUGGEST THAT ANY ASH BETWEEN FL160 AND FL230 WOULD MOVE TOWARD THE WEST SOUTHWEST OR SOUTHWEST AT 5 TO 10 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 23/0800 UTC. . TURK/SAB/NOAA/NESDIS . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN