FVXX21 KWBC 312000 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2000 UTC 31 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-054 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY...GEOPHYSICAL INSTITUTE IN QUITO...QUAYAQUIL MWO...NATIONAL WEATHER SERVICE WEATHER MODEL DATA . ERUPTION DETAILS: OCCASIONAL VENTING OF ASH AND STEAM. . DETAILS OF ASH: SURFACE REPORTS ADJACENT TO THE TUNGURAHUA VOLCANO CONTINUE TO INDICATE VOLCANIC ASH OVER THE SUMMIT. SATELLITE IMAGERY THROUGH 1915 UTC ALSO SUGGESTS A VERY SMALL ASH CLOUD OF NEAR-SUMMIT ALTITUDE IN THE VICINITY OF THE VOLCANO. THE GEOPHYSICAL INSTITUTE HAS ALSO REPORTED RECENTLY THAT STEAM AND OTHER GASES HAVE BEEN OCCASIONALLY EMITTED. CAUTION IS STRONGLY ADVISED. . TRAJECTORY: ASH AND GASES AT A NEAR-SUMMIT ALTITUDE ARE EXPECTED TO MOVE WEST AT 10 TO 20 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 STATEMENT WILL BE ISSUED BY 01/0200 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN