100th meridian: East-west divide between moist and arid parts of U.S. may be shifting

Warming climate may push western aridity to the east

Source: Lamont-Doherty Earth Observatory, Columbia University

Nearly a century and a half after explorer John Wesley Powell zeroed in on the 100th meridian west as the dividing line between the humid east and arid west of the United States, researchers say he was right — but that climate change is now moving the line eastward, into the traditionally fertile Midwest. The effects on U.S. farming and other pursuits could be huge.

From Science Daily

https://www.sciencedaily.com/releases/2018/04/180411110957.htm