INSIVUMEH reported that there were 13-24 explosions per hour recorded at Fuego during 9-10 and 12-14 May, generating ash plumes that rose as high as 1.1 km above the crater rim and drifted 10-15 km S and SW.
Explosions sometimes produced shock waves that rattled houses in areas to the S and SW.
Incandescent material was ejected 200-300 m high and caused avalanches of material that occasionally traveled long distances (and reached vegetated areas) down the Seca (W), Taniluyá (SW), Ceniza (SSW), Trinidad (S), and Las Lajas (SE) ravines.
Ashfall was reported in areas downwind including Santa Sofía (12 km SW), Morelia (9 km SW), Panimaché (8 km SW), El Porvenir (8 km ENE), and Sangre de Cristo (8 km WSW).
Lava flows were 500-600 m long on the W flank.
On 11 May steaming lahars descended the Las Lajas, Seca, Ceniza, and Mineral drainages, carrying variously-sized blocks and tree parts.
Lahars on 14 May carried blocks and tree trunks down the Ceniza drainage.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)