SERNAGEOMIN reported that after two weeks of inclement weather around Chaitén, clouds cleared on 18 July and ash plumes were observed. During 18-21 July mushroom-shaped ash plumes emitted from the S sector of the new lava dome rose to an altitude of 2.5 km (8,200 ft) a.s.l. Occasionally, explosions would push the plumes to altitudes of 3 km (10,000 ft) a.s.l. The plumes drifted N and NW, affecting several areas on the coast. The Alert Level remained at Red.
Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”