From the National Weather Service in Sacramento:
The persistent ridge to the start of 2015 will temporarily weaken as a Pacific weather system moves inland. Although earlier model runs indicated precipitation extending well into the central part of CA, the models are trending farther north, keeping most of the precipitation north of Interstate 80. The forecast precipitation graphics would suggest most of the precipitation would occur along the northern CA coast and the Pacific NW. [...] Few impacts are expected in interior northern CA over the weekend, with mainly dry weather and no impacts for the Martin Luther King, Jr. Holiday on Monday.