IG reported that although visual observations were occasionally limited due to cloud cover, ash-and-steam and ash plumes from Tungurahua were observed and rose to altitudes of 6-8.5 km (19,700-28,000 ft) a.s.l. during 19-25 December. Plumes drifted SE, SW, and WNW. Ashfall was reported in areas to the SW, W, NW, and N. Roaring noises and “cannon shots” were heard almost daily and windows and floors vibrated on 19, 21, and 23-24 December. On 19, 22, and 23 December, incandescent blocks were seen rolling hundreds of m down the flanks. Sounds indicating rolling blocks on the flanks were reported during 20-22 December, but were not observed due to cloud cover.
According to news articles, nearly 1,200 people in Penipe were evacuated nightly by security, and specific communities around the volcano remained at an Orange Alert level.
Sources: Instituto Geofísico-Escuela Politécnica Nacional , Associated Press – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”