Description: From Neal and others (1996): "Ground observers in Glennallen reported unusual white cloud formations over Mount Sanford on April 5 and 6, 1993. Another report on April 8, 1993, indicated that the mountain 'was steaming' from low on the east or south side (there were conflicting reports) and the resultant cloud was boiling up the flank to an estimated 5,000 ft (1,524 m) over the top of the peak. This level of apparent activity was more than this observer had noted in 21 years of viewing the volcano. Given the history of rock and ice falls from the shear south flank of the mountain and the fact that the phenomenon was short lived, AVO concluded that the observations were probably related to a large avalanche(s) or to unusual orographically induced weather clouds. No mention of the event was made in the AVO weekly update."