Chris Fontana, "The Old Forecaster" 5/17/2013
The low pressure trough is now moving out of our area. Clouds and isolated showers will continue over Siskiyou, northern Shasta, Modoc, Lassen, and Plumas counties until late afternoon. The rest of the north state will partly to mostly sunny, today, with a few clouds.
Saturday there will be partly cloudy skies north of Redding with mostly sunny skies elsewhere. Isolated afternoon showers are possible over Siskiyou, Modoc, and northern Lassen counties. Temperatures Saturday will be near normal. Sunday and Monday high pressure will be back along the west coast. The north state will be mostly sunny with temperatures 4 to 8 degrees above normal. Gusty north winds will start late Saturday and continue until Monday afternoon.
Tuesday the weather pattern will change. A cold low pressure area will drop southward along the coast. (see map below). Tuesday will be mostly sunny with a few clouds in the afternoon, but temperatures will begin to cool. Gusty southwest to northwest winds will occur. Wednesday the low will continue along the coast but will still have limited moisture. Skies will be partly cloudy along the areas near the Oregon border with a few light showers. Snow levels will be 5000 to 6000 feet. The areas to the south will be partly sunny with a few clouds. Gusty southwest to northwest winds will continue and temperatures will drop to below normal. Thursday the low will pickup up a little more moisture the showers will increase but still be confined to the coastal and northern mountains.