yield is otherwise established for the covered commodity on the farm, the Secretary shall establish an appropriate payment yield for the covered commodity on the farm under paragraph (2). (2) Use of similarly situated farms To establish an appropriate payment yield for a covered commodity on a farm as required by paragraph (1), the Secretary shall take into consideration the farm program payment yields applicable to that covered commodity for similarly situated farms. The use of such data in an appeal, by the Secretary or by the producer, shall not be subject to any other provision of law. (c) Single opportunity To update yields in counties affected by drought (1) Election to update In the case of a farm that is physically located in a county in which any area of the county was rated by the U.S. Drought Monitor as having a D4 (exceptional drought) intensity for 20 or more consecutive weeks during the period beginning January 1, 2008 and ending December 31, 2012, at the sole discretion of the owner of such farm, the owner of a farm shall have a 1-time opportunity to update, on a covered-commodity-by-covered-commodity basis, the payment yield that would otherwise be used in calculating any price loss coverage payment for each covered commodity on the farm for which the election is made. (2) Method of updating yields for covered commodities If the owner of a farm elects to update yields under paragraph (1), the payment yield for covered commodities on the farm, for the purpose of calculating price loss coverage payments only, shall be equal to 90 percent of the average of the yield per planted acre for the crop of covered commodities on the farm for the 2013 through 2017 crop years, as determined by the Secretary, excluding any crop year in which the acreage planted to the covered commodity was zero. (3) Use of county average yield For the purposes of determining the average yield under paragraph (2), if the yield per planted acre for a crop of a covered commodity for a farm for any of the crop years in paragraph