FVXX21 KWBC 312025 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 2025 UTC 31 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-055 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: CURRENT VENTING OF ASH AND STEAM. . DETAILS OF ASH: THE QUAYAQUIL MWO AND SURFACE REPORTS ADJACENT TO THE TUNGURAHUA VOLCANO SUGGEST THAT ACTIVITY HAS INCREASED OVER THE LAST HOUR. ASH IS BEING REPORTED BY THE MWO TO FL230. SATELLITE IMAGERY THOROUGH 1945 UTC DOES INDICATE A VERY SMALL ASH CLOUD OVER AND JUST TO THE WEST OF THE VOLCANO. THE ASH IS DISPERSING QUICKLY AS IT MOVES DOWNWIND. THE GEOPHYSICAL INSTITUTE HAS ALSO REPORTED RECENTLY THAT STEAM AND OTHER GASES HAVE BEEN OCCASIONALLY EMITTED. CAUTION IS STRONGLY ADVISED. . TRAJECTORY: ASH AND GASES REACHING FL230 ARE EXPECTED TO MOVE TO THE 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