Snow enthusiasts across the Sierra have good reason to rejoice in the new year because the snowpack is already at 200 percent of normal and it's only December.Part of that precipitation came from an unusually wet December, which has seen almost a doubling of the average amount of precipitation of 1 inch, at 1.92 inches.“It's double what we should have for the month,” Meteorologist Brian Brong with the National Weather Service said.Although the superior ski season could sour into sorrowful slush, chances are the 200 percent above average snowpack will make an exceptional base for skiers.“We've started the wettest period …