RVO reported that during 21-28 May ash plumes from Rabaul caldera’s Tavurvur cone rose to an altitude of 1.2 km (3,900 ft) a.s.l. and drifted N. Intermittent roaring noises were heard and ashfall was reported in Rabaul Town (3-5 km NW). During 25-27 May, ash and steam plumes drifted N, NW, and W, resulting in almost continuous ashfall in nearby areas. Occasional roaring noises were again reported.
Source: Steve Saunders, Rabaul Volcano Observatory (RVO) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”