On 18 June, INSIVUMEH reported that explosions from Fuego produced ash plumes that rose to an altitude of 4.3 km (14,100 ft) a.s.l. and drifted W and SW. Incandescent material was ejected 50 m above the crater. Constant avalanches of blocks descended the W flank and rumbling and degassing noises were reported. On 20 June, a lahar that was hot in areas, descended the Ceniza drainage to the SW, dragging tree branches and blocks 0.5-1 m in diameter.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH) – “Report provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”