FVXX20 KWBC 252300 VOLCANIC ASH ADVISORY ISSUED: 2001APR25/2300Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/55 . INFORMATION SOURCE: GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY. 6 HOUR WIND FORECAST FROM THE 25/1800Z AVIATION MODEL. GUAYAQUIL METEOROLOGICAL WATCH OFFICE SIGMET. . ERUPTION DETAILS: ASH EMISSION AT 25/2100Z. . DETAILS OF ASH CLOUD: AN AIRCRAFT REPORTS ASH OVER THE VOLCANO TO FL230. CURRENT SATELLITE IMAGERY THROUGH 25/2215Z SHOWS CONSIDERABLE CLOUDINESS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL230 WILL MOVE TOWARDS THE SOUTHWEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 26/050OZ . REAL TIME SATELLITE IMAGERY AND 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. . WALTER/ORRISON . NNNN