This 96-hour surface forecast comes from US Coast Guard NOJ, in Kodiak, Alaska. December is when the "Roaring Forties" really start to crank up the storms in the Pacific, and the weather depicted here is no exception.
The stationary high pressure area off Southern California is also something of a weather fixture in the Northern Hemisphere autumn. Storms tend to track north of this high, causing rainy weather in the north and dry conditions down here.
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