The overnight session that started Monday evening was the first opportunity to trade CME grain and soy futures since Friday. Wheat futures traded higher, but corn and soybean prices started out unchanged to lower. The latter gradually turned green as well in response to an array of threatening weather conditions and forecasts for Black Sea winter wheat, southern U.S. Plains HRW, Midwestern heat, Russian spring wheat, Brazilian second crop corn and Australian wheat. Stronger prices continued as trading resumed for the day session, but a good deal of the impetus behind the earlier rally had faded by midday. Word that the Trump administration was readying a list of $50 billion of Chinese goods that could be subject to 25 percent tariffs put a...