Based on information from JMA, the Tokyo VAAC reported that during 25-28 July ash plumes from Sakura-jima rose to altitudes of 2.4-4.3 km (8,000-14,000 ft) a.s.l. and drifted N, NE, and S.
Source: Tokyo Volcanic Ash Advisory Center (VAAC) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.” Photograph by Mike Lyvers.
Volcano World : Supplement 