Grains soar as the USDA lowers its estimate of corn ending stocks to 619M bushels from 733M in September. The cut comes even as it raises its forecast of harvested acres to 360K. What happens, asks Arlan Suderman, if the USDA is forced to cut harvested acres in its next report? Yikes. Corn +4%, Beans +2.1%, Wheat +1.5%.