Summary- The jet stream (or storm track) will be orienting W-E into California through December 15th. This will bring more rains and moisture into all of California, especially in the central and northern portions. Cold NW-NNW flow returns from December 16-27. Cold sea surface temperatures (SSTs) are supporting a generally colder airmass. For us in California, this means a higher risk of frosts and freezes, and lower snow levels during the rain events. This will be producing abundant snowfall in the Sierras. Support for the longwave trough near the coast of central California in the eastern north Pacific (130W) and a longwave ridge out at 140-150W will continue into the first week of January 2017.