Chilly air is on the move Tuesday night and Wednesday. While few of us will pick up a rain shower in the wake of the latest cold front, most will feel the effects of a chillier air mass. By Thursday morning, some northern Wasatch mountain valleys may have to contend with a freeze. Temperatures will rebound this holiday weekend, but not before showers and a thundershower keep it chilly on Saturday. Brighter weather returns for the second half of the 3-day weekend.