FVXX20 KWBC 230820 VOLCANIC ASH ADVISORY ISSUED: 2001AUG23/0820Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/209 . INFORMATION SOURCE: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. GUAYAQUIL METEOROLOGICAL WATCH OFFICE. GEOPHYSICAL INSTITUTE. SIX HOUR FORECAST FROM 23/0000Z AVIATION MODEL. . ERUPTION DETAILS: NEARLY CONTINUOUS ERUPTION SINCE 06/1203Z. . DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 0745Z SHOWS A BROAD AREA OF CIRRUS CLOUDS OVER THE AREA MAKING IT DIFFICULT TO DETECT ASH. MOST RECENT OBSERVATIONS FROM THE GEOPHYSICAL INSTITUTE REPORTED ASH BETWEEN FL200 TO FL250. . TRAJECTORY:. ASH UP TO FL250 WILL MOVE WESTWARD AT 10 TO 15 KTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT ADVISORY WILL BE ISSUED BY 23/1430Z. . 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. . . NNNN