A dozen leading U.S. retailers are reducing profit forecasts and blaming warmer weather for contributing to slumping sales. Retailers plagued by lower-than-expected September earnings included Nordstrom, Target, American Eagle Outfitters, Limited Brands, and JCPenney, all of which have had trouble moving autumn and winter clothing. Our suggestion: prove those reduced-profit predictions right by buying your winter shorts at that cute local place down the street.