Lauren Parnell, 9, left, and Ella Sweeney, 6, climb to the top of the hill for another sled run at Flag Pole Hill Park in Dallas, on Tuesday, Dec. 25, 2012. (AP Photo/The Dallas Morning

 

              Lauren Parnell, 9, left, and Ella Sweeney, 6, climb to the top of the hill for another sled run at Flag Pole Hill Park in Dallas, on Tuesday, Dec. 25, 2012. (AP Photo/The Dallas Morning
Lauren Parnell, 9, left, and Ella Sweeney, 6, climb to the top of the hill for another sled run at Flag Pole Hill Park in Dallas, on Tuesday, Dec. 25, 2012. (AP Photo/The Dallas Morning News, Stan Olszewski) MANDATORY CREDIT; MAGS OUT; TV OUT; INTERNET OUT; AP MEMBERS ONLY