Ice Age climate records from an Arizona stalagmite link the Southwest’s winter precipitation to temperatures in the North Atlantic, according to new research. The stalagmite yielded an almost continuous, century-by-century climate record spanning 55,000 to 11,000 years ago, a time the Southwest flip-flopped between wet and dry periods. The finding is the first to document that the abrupt changes in Ice Age climate known from Greenland also occurred in the southwestern US.