CHICAGO (Reuters) - A shift back to drier weather is expected in most of the key wheat growing areas of the drought-stricken U.S. Great Plains hard red winter wheat region, an agricultural meteorologist said on Wednesday. Early in the week there had been outlooks for significant rain and/or snow in much of the region which would have given the battered wheat crop a welcome dousing, but patterns have changed to a drier mode, he said. ...