A high pressure system sits over the east coast, bringing sunny and warm summer weather for the end of this work week. Some clouds will move into the commonwealth late on Friday night, ahead of scatted thunderstorms throughout the day on Saturday. Thunderstorms may carry over into the early hours on Sunday, but skies clear up later in the afternoon. A cold front moves across the eastern half of the United States on Monday and Tuesday, bringing thunderstorms on a fairly hot Monday and a cooler than average Tuesday to start the work week.