The Washington VAAC reported that on 20 November an ash plume from a possible eruption at Sangay was observed by a pilot and drifted at an altitude of 5.9 km (19,500 ft) a.s.l. Ash was not detected in partly-cloudy satellite imagery.
Source: Washington Volcanic Ash Advisory Center (VAAC)
...Read more http://www.volcano.si.edu/reports/usgs/index.cfm?wvarweek=20111116#sangay
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