FVXX21 KWBC 270800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0800 UTC 27 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-036 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 AND NATIONAL WEATHER SERVICE NUMERICAL MODELS . ERUPTION DETAILS: CONTINUOUS VENTING OF ASH AND STEAM. . DETAILS OF ASH: GOES-8 SATELLITE IMAGERY THROUGH 27/0715 UTC SHOWS THE AREA CONTINUES TO BE OBSCURED BY CLOUDS MAKING DETECTION OF ASH DIFFICULT. . THE QUITO GEOPHYSICAL INSTITUTE REPORTS ASH FROM THE VOLCANO REPORTS SLIGHT REDUCTION OF ASH FLOW AT ABOUT FL180 MOVING TOWARD THE SOUTH TO SOUTHWEST AT 10KT. . TRAJECTORY: NATIONAL WEATHER SERVICE NUMERICAL METEOROLOGICAL MODELS PREDICT THAT ANY ASH AT FL180 WOULD MOVE TOWARD SOUTH AT 10KT. . 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 STATEMENT WILL BE ISSUED AROUND 27/1400 UTC. . . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . . NNNN