An upper-level low pressure system is cutting off from the jet stream and will shift southwestward off the California Coast by tomorrow. The low is directing moist south-southwesterly flow across the state today and tonight for a chance of light rain showers. Up to 0.25” accumulation is possible. Showers will become less likely Tuesday morning-Wednesday as the low retrogrades (shift westward). Otherwise, expect breezy and cooler conditions.
Another upper-level trough will dig south along the West Coast on Wednesday to Thursday and lift the cutoff low back across the state on Wednesday night to Thursday. Therefore, there is the possibility for another round of light showers Wednesday night to Thursday. Temperatures will be generally below normal through Thursday, but the weather will be nice for the coming weekend.
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Official National Weather Service forecast