Grain futures are still trying to decide whether lows will hold, getting some help from chart supports overnight to post modest gains. It’s also decision day at the Federal Reserve, where the central bank isn’t expected to raise interest rates but may announce when it will begin winding down $4.5 trillion in debt purchased to stimulate the economy. Storms will gradually work into the Plains and western Corn Belt over the next week ahead of a shift to cooler and drier weather.