Friday brings calm and dry conditions with some sunshine, but colder air arrives by evening. Light snow is expected Saturday in northwest PA and the Laurel Highlands, with rain or a wintry mix in southeastern and central areas. Sunday turns colder with gusty winds and scattered snow showers, mainly in the northwest. Monday remains cold and blustery, with highs struggling near freezing. Tuesday morning sees dangerously low temperatures and wind chills, with slight improvement later. By Wednesday, a mix of rain and snow showers is possible as temperatures begin to moderate.