FVXX20 KWBC 151200 VOLCANIC ASH ADVISORY ISSUED: 2001AUG15/1200Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/174 . INFORMATION SOURCE: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. GUAYAQUIL SIGMET. GEOPHYSICAL INSTITUTE IN QUITO. AVIATION MODEL UPPER WIND FORECAST. . ERUPTION DETAILS: CONTINUOUS ERUPTION SINCE 06/1203Z. . DETAILS OF ASH CLOUD: WE ARE UNABLE TO DETECT ASH IN SATELLITE IMAGERY THROUGH 1115Z. ASH FROM THE EARLIER ERUPTIONS IS NOW TOO DIFFUSE TO SEE IN SATELLITE IMAGERY. THE LAST OBSERVATION OF ASH FROM THE GEOPHYSICAL INSTITUTE WAS AT 15/0142Z WITH ASH UP TO FL280. . TRAJECTORY: ANY REMAINING ASH TO FL280 WILL MOVE TOWARDS THE SOUTHWEST AT 10 TO 15KTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT ADVISORY WILL BE ISSUED BY 15/1800Z. . INTERNET URLS... MESSAGE LISTSERV WWW.SSD.NOAA.GOV/VAAC/SUBSCRIBE.HTML MESSAGES GRAPHICS AND IMAGERY WWW.SSD.NOAA.GOV/VAAC/WASHINGTON.HTML (ALL LOWERCASE EXCEPT /VAAC/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . KARST . NNNN