Morning CME Globex Update:December corn is trading down 3 cents, November soybeans are up 2 cents, and September Chicago wheat is up 1/4 cent. Grains are mixed Wednesday morning after a quiet overnight session. This summer's weather remains favorable for crop development, so far, with light scattered showers throughout the Midwest on Wednesday. Dry conditions are an increasing concern in the northwestern Midwest with a surge of unseasonably cold air into the northern Plains expected to slow crop development late next week. At 8 a.m., USDA announced that 120,000 tons of U.S. soybeans were sold to unknown destinations for 2013-2014.