"While half of the Midwest should see scattered showers, dry spots will likely expand from 30% of the Midwest currently to at least 40% of the soybeans over the next week. This will include parts of central Illinois, western Iowa, Nebraska, Missouri and southern Wisconsin, while yield potential should be more stable elsewhere," according to CWG. "Showers then expand in the western Midwest from late in the 6 to 10 day period through the 11 to 15 day period, and this will improve rain chances in Nebraska, Iowa, Missouri and Kansas."
Those improved rainfall chances will likely be accompanied by lower temperatures, adds Craig Solberg of Freese-Notis Weather, Inc. "Temperatures will cool to the 70s behind this front and last thru the weekend. The NWS 6-10 forecast calls for below-normal temperatures for the central section of the Corn Belt for the period from August 18-22 with below-normal precipitation," he says. "The extended outlook from August 20-26 calls for below-to-normal temperatures with the possibility of normal to above normal precipitation particularly in the western Corn Belt during this period."