Official Climate Prediction Center Winter Weather Forecasts

For the month of December
http://www.cpc.ncep.noaa.gov/products/predictions/30day/

For the three winter months of Dec-Jan-Feb
http://www.cpc.ncep.noaa.gov/products/predictions/90day/lead01/index.html

The wettest period for the southwest is forecast for the Feb-Mar-April
time period.  That's a good time to help the runoff potential
http://www.cpc.ncep.noaa.gov/products/predictions/90day/lead03/index.html

Here's the new El Nino Update

EQUATORIAL PACIFIC OCEAN SURFACE TEMPERATURES REMAIN AT OR ABOVE TWO DEGREES C ABOVE NORMAL OVER MUCH OF THE REGION FROM 175W TO 100W.

LOCALIZED 3 DEGREE ANOMALIES ARE OBSERVED NEAR 160W. THE STRENGTH OF THE ANOMALIES HAS INCREASED STEADILY OVER THE PAST FEW MONTHS. 

CURRENT CONDITIONS ARE INDICATIVE OF A MODERATE EL NINO EPISODE.  THE US OUTLOOKS FOR THE COLD SEASON REFLECT THIS - SHOWING ABNORMALLY WARM CONDITIONS FOR THE NORTHERN CONTINENTAL U.S. WITH DRIER THAN NORMAL CONDITIONS OVER SECTIONS OF THE NORTHWEST - THE NORTHERN GREAT PLAINS - AND THE GREAT LAKES-OHIO VALLEY REGION.  ABNORMALLY WET – AND IN SOME AREAS - COOL - CONDITIONS ARE EXPECTED ACROSS MUCH OF THE SOUTHERN TIER OF THE U.S. DURING THE WINTER AND INTO THE SPRING.