FVXX21 KWBC 200200 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0200 UTC 20 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-007 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 . DETAILS OF ASH: THE GUAYAQUIL METEOROLOGICAL WATCH OFFICE REPORTS THAT ASH AT ABOUT FL250 WAS OBSERVED NEAR THE VOLCANO. DENSE METEOROLOGICAL CLOUDS PREVENT DETECTION OF ASH IN SATELLITE IMAGERY THROUGH 0115 UTC. . TRAJECTORY: ASH AT ABOUT FL250 IS REPORTED TO BE MOVING TOWARD THE EAST SOUTHEAST AT AN UNKNOWN SPEED. UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT ABOUT FL250 WOULD MOVE AT LESS THAN 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 20/0800 UTC . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN