FVXX21 KWBC 310800 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0800 UTC 31 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-052 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 IN QUITO...NATIONAL WEATHER SERVICE WEATHER MODEL DATA . ERUPTION DETAILS: OCCASIONAL VENTING OF ASH AND STEAM. . DETAILS OF ASH: IN THEIR DAILY REPORT THE GEOPHYSICAL INSTITUTE INDICATED THAT SEISMIC ACTIVITY HAD BEEN LOW DURING THE DAY BUT EXPLOSIONS OF INCANDESCENT MATERIAL...STEAM AND GASES HAD BEEN MORE FREQUENT. THE GEOPHYSICAL INSTITUTE THROUGH THE GUAYAQUIL MWO REPORTS VOLCANIC ASH MOVING EAST TO SOUTHEAST. THE LAST REPORTED HEIGHT WAS FL210. SATELLITE IMAGERY THROUGH 0715 UTC INDICATED HIGH LEVEL CLOUDS BUT NO ASH SIGNATURE WAS DETECTED. . TRAJECTORY: EAST TO SOUTHEAST AT 15 KT. . 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 31/1400 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . SCHWARTZ . NNNN