An unusually potent storm will affect the West Coast of the United States from Friday to Saturday with areas of heavy rain and feet of mountain snow, AccuWeather meteorologists say. The precipitation will come when most Pacific storms have ended for the season or are throttling down as the dry season builds. The bulk of the rain will fall from western Washington to Northern California, where a general 1-3 inches will fall. However, there will be pockets where 3-6 inches of rain can pour down, es