FVXX21 KWBC 201230 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1230 UTC 20 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-591 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. . ERUPTION DETAILS: NEARLY CONTINUOUS GAS AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 20/1145 UTC DUE TO WEATHER CLOUDS OVER THE AREA. NO SURFACE BASED OBSERVATIONS HAVE BEEN MADE DUE TO BOTH WEATHER AND DARKNESS HOWEVER SEISMIC SIGNALS AND ERUPTIVE SOUNDS CAN BE HEARD WHICH ARE INDICATIONS OF CONTINUED ACTIVITY AT THE VOLCANO. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT IF THERE IS ANY ASH BETWEEN THE SUMMIT AND FL260 IT WOULD MOVE TOWARD THE WEST AT ABOUT 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 20/1900 UTC. . 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/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN