The Nevado del Huila volcano is on orange alert, meaning an eruption is probable within days or weeks, the Colombian Institute of Geology and Mining said last week. An eruption would cause an avalanche down the Paez and Simbola rivers, officials said. The town under evacuation, Belalcazar, sits on the bank of the Paez River about a half-mile (less than a kilometer) from the junction with the Simbola River. It was the worst-hit area in November's eruption. To continue reading, click here.