Wheat fell to a seven-month low Tuesday after much-needed moisture helped some dry crops in the U.S. Snow and rain were moving across the Southwest Plains, which will help but not eliminate the harmful impact on wheat production from the worst drought in more than 50 years, agricultural meteorologist Don Keeney of MDA EarthSat Weather said. "The market's breaking lower with an increasing chance of rain in some of these dry areas," said Don Roose,