RIVERSIDE (CNS) - Sunny skies are expected throughout Riverside County Friday, but a storm system is tracking toward Southern California this weekend and could arrive Sunday. The low pressure system is expected to bring cooler temperatures, gusty winds out of the west and the possibility for rain throughout the county along with snow in the mountains, according to the National Weather Service. The track of the storm remains unclear and it could center itself off the coast, which would bring only light rain west of the mountains, forecasters said. The storm is expected to arrive early Sunday and bring a chance of precipitation through at least Tuesday morning. Snow levels are expected to drop to around 3,800 feet on Monday morning, then rise to about 5,200 feet Monday night.