Grain and soy market futures prices have mostly been moving up or down for the past two weeks, and the star performer has been MGEX spring wheat futures. Based on what has transpired so far, it is reasonable to project a 2017/18 U.S. spring wheat supply/demand balance using different yield possibilities.For the past two weeks, grain and soy market futures prices have mostly been moving up or down in response to the latest seven-day weather model projection for the northern Plains and central U.S. That price pattern indicates just how inconsistent and ever-changing those weather models have been recently. There have been changes from one model run to the next, and the Global Forecast System (GFS) and EU models have disagreed on short-term ou...