Grain and soy prices were mildly firmer overnight, based mostly on forecasts that the adverse South American weather conditions would persist at least through January. Otherwise, inputs were lacking, however, and trading was uninspired. The overnight trade gave no hint of the rally that took off about midway through the day session. KC HRW futures were the leader, suddenly popping up about 12 cents with Chicago wheat in tow. It did not take long for corn and soybeans to join in the upward direction. This was an unusual move for KC wheat, and every rally of course needs a reason. Therefore, it did not take long for rumors that China had bought some U.S. wheat to circulate. We emphasize that there is no confirmation of the rumor at this writi...