The National Weather Service office in Sacramento says this weekend "could be the greatest potential for significant flooding we've seen in over 10 years." Meteorologists are forecasting up to 15 inches of rain in the Sierra Nevada, while higher elevations could see an additional 2 feet of snow on Saturday alone, causing a travel nightmare. An earlier storm dumped several feet of snow in lower elevations, and this system will bring mostly rain in those same areas. The rain will melt the snow and cause additional runoff, possibly leading to significant flooding and even landslides.