USDA's U.S. corn yield projection of 166 bushels per acre is in trouble. The simple fact is that it has not rained across much of the Corn Belt since late April/early May. Extended weather models have consistently shown a shift to a wetter weather pattern, but so far that pattern shift has been elusive. That was the case again this week when Tuesday's and Wednesday's models clearly showed the potential for heavy rains across the driest parts of the eastern Corn Belt next week. Those forecasts again changed significantly Wednesday night and Thursday morning to a much drier outlook. Last Monday's corn condition ratings dropped 6 percent from the good to excellent categories. The 2012 U.S. corn crop ratings are below last year's and will lik...