FVXX21 KWBC 200800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0800 UTC 20 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-008 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 ...SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE...U.S. NATIONAL WEATHER SERVICE AVIATION MODEL WINDS . ERUPTION DETAILS: INTERMITTENT ASH EMISSIONS THROUGHOUT DAY..19 OCTOBER TO FL250. . DETAILS OF ASH: THE AREA REMAINS CLOUD COVERED THUS MAKING DETECTION OF ASH IMPOSSIBLE. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT FL250 WOULD MOVE WEST-SOUTHWEST AT 5-10 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 BY 20/1400 UTC . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN