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A storm system is moving into Southern California, bringing moderate to heavy rain, a risk of thunderstorms, and dangerous surf conditions from Wednesday morning through Thursday afternoon. The highest risk of localized flooding and debris flows is concentrated in Malibu, Pacific Palisades, and the Santa Monica Mountains, areas recently affected by wildfires .
Rain is expected to begin in Ventura County Wednesday morning and spread across the Los Angeles area. The most intense period of rainfall is forecast from Wednesday night into Thursday morning . Rainfall totals are expected to range from 13 to 51 millimeters (0.5 to 2 inches) across most areas, with up to 76.2 millimeters (3 inches) possible in foothills and coastal slopes . The National Weather Service (NWS) estimates a 30% to 40% chance of thunderstorms .
The NWS has issued a flood watch for the Malibu coast and Santa Monica Mountains from Wednesday afternoon through Thursday afternoon . The primary concern is for debris flows in areas with recent burn scars. While most areas are expected to see only minor impacts, a heavy downpour or isolated thunderstorm could cause localized issues .
A beach hazards statement is in effect through Thursday night for Los Angeles and Orange County beaches. Swells of 3 to 6 feet are expected, creating dangerous rip currents and breaking waves. The NWS advises staying out of the water .