Half of Saskatchewan is under an extreme cold warning. Local areas under the warning include Yorkton, Melville, Esterhazy, Fort Qu’Appelle, Indian Head, Wynyard and Wadena. Russ Murley at Precision Weather says this is common for this time of year, and is due to a dome of Arctic air pushing on from Alaska and northern B.C. He says temperatures will moderate slightly Friday, but also says tomorrow night will be the coldest, with the air temperature minus 38.