From the paper: "In response to increasing concentrations of greenhouse gases (GHGs), climate models from the Coupled Model Intercomparison Project (CMIP) versions 3 and 5 indicate decreases in precipitation in the subtropics and increases in middle to high latitudes."

This modeling prediction is in line with what we've observed:

* https://www.researchgate.net/publication/6191539_Detection_o...

* http://nca2014.globalchange.gov/report/our-changing-climate/...