The July 2011 Chilean winter storm was a winter storm affecting the Andean portions of Biobío, including Ñuble Province, and Araucanía regions in south-central Chile.[1] Through the Andean valleys thousands of people were left isolated because of heavy snowfall.[1] In some sectors, blackouts occurred.[1] Avalanches left the tourist facilities of Termas de Chillán isolated. There was a loss of livestock, mainly sheep as a consequence of the storm. On the night of July 19, temperatures as low as -18C were reported in Liucura.
The Chilean Air Force made an operation to deliver supplies to isolated localities.[2] Defense Minister Andrés Allamand visited the affected area.[2]