The National Weather Service in Sacramento welcomes the new year with forecasts of light mountain showers and cooler mornings. A weather system is set to move in late this week, according to the latest update from NWS Sacramento, bringing with it more widespread precipitation, light mountain snow, and a slight chance of Valley thunderstorms. The light showers today will have minimal impact, with less than a quarter inch of rain expected in most areas around the northern Sacramento Valley, foothills, and mountains.