INSIVUMEH reported that there were 8-17 explosions per hour recorded at Fuego during 14-21 January, generating ash plumes that rose as high as 1.1 km above the crater rim and generally drifted 10-22 km SW and W.
Ashfall was reported in several areas downwind including Santa Sofía (12 km SW), Morelia (9 km SW), Panimaché I and II (8 km SW), Finca Palo Verde, San Pedro Yepocapa (8 km NW), Sangre de Cristo (8 km WSW), and El Porvenir (8 km ENE).
Explosions sometimes produced shock waves that rattled houses in communities within a 7 km radius, though they were felt up to 25 km away during 19-20 January.
Incandescent material was ejected 100-500 m high and caused avalanches of material that occasionally traveled long distances (reaching vegetated areas) down the Seca (W), Taniluyá (SW), Ceniza (SSW), Trinidad (S), Honda, and Las Lajas (SE) ravines.
Ash plumes drifted 18 km E during 20-21 January.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)