U.S. grain and soy futures markets, particularly Chicago wheat futures, are as sensitive to changing U.S. dollar values as other commodity markets and more so than many. Today's price action for wheat, corn and soybean futures markets is a good example. General Comments Today was the day of the U.S. dollar. A sharp and unexpected plunge against the euro and other major currencies caught many traders leaning the wrong way. The U.S. dollar's steep drop sent buyers into numerous commodity markets with many trying to cover short positions. The U.S. Dollar Index closed down 145 points or 1.5 percent. At its day's low, it was off 176 points.There appeared to be two factors sending the U.S. dollar into a tailspin. First, it was reported that con...