Coinciding with Lake Tauca, between 17,000 and 11,000 BP glaciers expanded in the Andes between 18° and 24° south latitude. At Lake Titicaca, glacial tongues approached the shore. The equilibrium line altitude of glaciers in the dry Andes decreased by . Such glacial advances may have been preceded by the humid episodes which formed Lake Tauca. Around 13,300 BP, maximum glacier size in southern Bolivia is associated with a highstand of Lake Tauca. Glaciers did not expand everywhere, however, and there is little evidence for glacial expansion at Llano de Chajnantor. Frequent incursions of polar air may have contributed to glacial expansion. At Tunupa, a volcano located in the centre of Lake Tauca, maximum glacial extent lasted until the lake reached its highest level. Glacial shrinkage beginning 14,500 years ago probably occurred at the same time as a drop in lake levels, although dating ambiguity leaves room for debate. The Cerro Azanaques moraines reached their greatest extent from 16,600 to 13,700 BP. The existence of Lake Tauca coincides with the Late Glacial Maximum, when temperatures in the central Altiplano were about lower. Part of the glacial advance may have been nurtured by moisture from Lake Tauca, a conclusion supported by oxygen isotope data from the Sajama glaciers. The Chacabaya glacial advance may be contemporaneous with Lake Tauca. Just like the Lake Tauca highstand may have coincided with the first Heinrich event, the Younger Dryas may be associated with the Coipasa highstand and the second Central Andean Pluvial Event although the Younger Dryas ended two millennia before the CAPE. The second CAPE was caused either by changes in the South American monsoon or by changes in the atmospheric circulation over the Pacific Ocean, and its end has been attributed to a warming North Atlantic drawing the ITCZ northward. Today, the average temperature at stations at an altitude of is .