From Daniel Swain at the California Weather Blog:
“A pretty big storm is headed for Southern California this evening, yet the radar (and even satellite) imagery remains rather quiet at the moment. The reason: instead of taking a long eastward trajectory over the Pacific Ocean–as so many systems destined for California do–this one is developing much closer to home: only 500 miles or so west of Santa Barbara. An area of surface low pressure is rapidly developing this evening on the cyclonically-curved side of a locally-enhanced subtropical jet stream. This surface low is only just starting to become visible on the last couple of satellite frames from a couple of hours ago, but is expected to deepen rather quickly as it approaches the coast Sunday morning. As the surface cyclone wraps up, a strong cold front will develop over the Southern California coastal waters–aided by some unusually cold air aloft becoming entrained into the broader circulation. … ”
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