Great web site for weather models. The link here will take you to a surface map of the United States, but you can get closer if you change the Zoom on the top, then Regional, then click the blue dot near Las Vegas. You can also make it a loop or change the model with the other blue dropdowns near the top.
Look at other levels of the atmosphere (besides the surface) by changing the parameter on the left. Make sure the Run in the upper left is current! Otherwise you'll be looking at an old forecast.
Precipitation (rain & melted snow) forecast for interior northern California for the next 6 days, from the California Nevada River Forecast Center. Change the Location and/or Time Period for more specific data.
LOTS of other good stuff on here, so after you check out the rain forecast, look at the Hydrology, Weather, Climate or other tabs for other information.
You'll need to know the 3 letter airport codes for our area.
RDD= Redding, RBL=Red Bluff, CIC=Chico, OVE=Oroville, MYV=Marysville, SAC=Sacramento, MHS=Mt. Shasta, AAT=Alturas, SFO=San Francisco, RNO=Reno.