The weather system feared to form a phenomenon known as a derecho began moving into Pennsylvania early this morning, sweeping through western PA in the 3 and 4 o’clock hours and then continuing its path across the Commonwealth. Much of the state is in store for severe thunderstorms, heavy rain and damaging winds, along with the possibility of tornadoes and large hail. The saving grace is that the system is moving rapidly. As the storms moved into PA, it appeared that the middle swath of the state would see the strongest thunderstorms, while the heaviest sustained rains could come in the northern and southern tiers.