Rain showers and perhaps a couple of thunderstorms will persist this morning, with coverage decreasing by this afternoon. One more mild day is expected with high temperatures in the 50s to lower 60s. Then, the coldest air of the winter begins to arrive tonight behind a cold front. Dangerous bitter cold temperatures and wind chills are forecast through Wednesday. Wind chills will drop into the single digits above and below zero Sunday Night, and in the single digits and teens Monday and Tuesday nights. Air temperatures will stay below freezing for many areas through Tuesday and Wednesday.