NWS Forecast Office Los Angeles, CA

A weak upper level trough of low pressure combined with lingering moisture and instability will bring scattered showers and isolated thunderstorms across interior sections through this evening, especially the mountains of Ventura and Santa Barbara counties. Any storms that develop today will be capable of producing brief heavy downpours with local roadway flooding as well as small hail. A colder upper level low pressure system will then bring the threat of widespread showers to southwestern California on Sunday, with a slight chance of thunderstorms expected in the mountains. Snow levels will range between 6000 and 7000 feet on Sunday, then lowering to around 5000 feet Sunday evening. Moderate snow accumulations are expected at the resort levels. Rainfall amounts with this system are generally expected to be 0.10 inch to 0.50 inches across coastal and valley areas, with 0.25-1.00 inch possible in the mountains. Roadways will be slippery on Sunday, leading to potential travel delays. Any thunderstorms in the mountains may contain brief heavy rain, small hail, gusty winds and dangerous lightning. Prepare for unusual winter weather driving conditions in the mountains on Sunday.