Thanks to South American weather problems, U.S. corn exports are soaring. According to the latest weekly export sales (data for week ending Sept. 29), corn exports are up 70% above the 5 year average. Weekly net corn sales for 2016/17 were 2,060,847 metric tons. U.S. exporters continue to gobble up market share away from Brazil with South Korea and Japan being the main purchasers.