FVXX21 KWBC 181930 VOLCANIC ASH ADVISORY ISSUED: 2001SEP18/1930 VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/256 . INFORMATION SOURCE: GOES-8 VISIBLE/INFRARED/MULTISPECTRAL IMAGERY. 18/1800Z UPPER WINDS FORECAST FROM THE 18/1200Z AVIATION MODEL. SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: ASH REPORTED AT 1900Z. . DETAILS OF ASH CLOUD: A SURFACE OBSERVATION REPORTS ASH OVER THE VOLCANO TO FL240. GOES-8 IMAGERY THROUGH 1915Z DOES NOT SHOW THE PRESENCE OF ASH DUE TO LOW AND MID LEVEL SCATTERED CLOUDS OBSCURING THE VOLCANO. THE OBSERVATION REPORTS ASH MOVING NORTH TO NORTHWEST. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ASH AT OR NEAR SUMMIT LEVEL TO FL250 WOULD MOVE WEST AT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 19/0130Z . 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. . HUGHES/KARST . NNNN