FVXX21 KWBC 130400 VOLCANIC ASH ADVISORY ISSUED 0400 UTC 13 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-690 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. SIGMET FROM GUAYAQUIL METEORLOGICAL WATCH OFFICE . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: A GUAYAQUIL SIGMET REPORTS THAT AT 13/0240 UTC THE GEOPHYSICAL INSTITUTE OBSERVED ASH TO FL250 OVER THE VOLCANO. NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 13/0315 UTC BECAUSE WEATHER CLOUDS COVER THE AREA. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL250 WOULD MOVE TOWARD THE WEST AT ABOUT 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 13/1000 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORIES 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