Hurricane Harvey is creating export challenges, but robust yield estimates keep pressuring grain and oilseed futures. The cattle and hog markets took diverging paths with cattle earning triple-digit gains and hogs suffering triple-digit losses. General Comments Grain futures were mixed in moderate volume overnight trade to start the week. Corn futures closed slightly lower, while soybeans managed to close a few pennies higher. All three wheat futures contracts closed 2.5–3 cents lower.Most of the early pressure on grain futures came from Friday’s Farm Journal Crop Tour report, which estimated the U.S. national corn yield at 167.5 bushels/acre (BPA) and the national soybean yield at 48.5 BPA. It estimated corn and soybean production would...