FVXX21 KWBC 220800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0800 UTC 22 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-016 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. BASED ON THIS INFORMATION FROM THE GEOPHYSICAL INSTITUTE AN ASH PLUME BETWEEN FL180 AND FL200 IS ASSUMED TO BE PRESENT THOUGH UNDETECTABLE IN SATELLITE IMAGERY THROUGH 0715 UTC. . TRAJECTORY: NUMERICAL MODEL FORECASTS SUGGEST THAT ANY ASH BETWEEN FL180 AND FL250 WOULD MOVE TOWARD THE WEST AT 5-10 KT. . 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 22/1400 UTC. . WALTER/SAB/NOAA/NESDIS . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN