FVXX20 KWBC 281800 VOLCANIC ASH ADVISORY ISSUED: 2001JUL28/1800Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/127 . INFORMATION SOURCE: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. GUAYAQUIL SIGMET. AVIATION MODEL UPPER LEVEL WIND FORECAST. . ERUPTION DETAILS: PROBABLE ASH OVER SUMMIT AT 28/0543Z. . DETAILS OF ASH CLOUD: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 28/1715Z BUT THE DENSE HIGH LEVEL WEATHER CLOUDS IN THE AREA COULD BE HINDERING ASH DETECTION. THE MOST RECENT KNOWN OBSERVATION OF ASH WAS BY THE GEOPHYSICAL INSTITUTE THAT OBSERVED PROBABLE ASH TO FL230 OVER THE SUMMIT AT 28/0543Z. . TRAJECTORY: ANY ASH TO FL230 WOULD MOVE TOWARD THE WEST AT ABOUT 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THIS WILL BE THE FINAL ADVISORY ON THIS EVENT UNLESS NEW INFORMATION IS RECEIVED. . 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. . NNNN