After a sunny Friday, most of Pennsylvania will experience an overcast and wet pattern over the weekend and into the beginning of next week. A stalled warm front will bring precipitation primarily to the western portion on the Commonwealth on Saturday along with the chance of some scattered thunderstorms. By Sunday, most of the rain will end, leaving overcast skies with warm temperatures in the seventies across most of the region. A strong cold front will develop to the west on Monday and will traverse Pennsylvania from Monday night to Tuesday morning, bringing periods of rain. Tuesday will feature partly cloudy skies and much cooler temperatures in the fifties. Temperatures will stay in the fifties and lower sixties on Wednesday with a chance for rain Wednesday night.