Southern California is bracing for a wave of wet weather running from Wednesday into Thursday, with forecasters warning of potential flooding, thunderstorms, and hazardous coastal conditions stretching from Oxnard down to the Mexican border.
Meteorological offices serving the region have outlined distinct risks associated with the incoming system. The National Weather Service office in Los Angeles and Oxnard estimates a 30% to 40% chance of thunderstorms, bringing widespread minor flooding and debris flow concerns across Los Angeles and Ventura counties. While most communities are expected to experience only minor impacts, forecasters emphasize that vulnerability varies significantly by location.
The Santa Monica Mountains have been identified as the area at highest risk for flooding. Particular concern surrounds first-year burn scars left behind by recent wildfires, including the Palisades and Altadena areas, where heavy runoff could trigger localized mud and debris movements.
Anticipated rainfall totals vary across the Los Angeles-Oxnard forecast area. Thousand Oaks is projected to receive 1.73 inches of rain from Wednesday into Thursday. Oxnard follows closely with an estimated 1.53 inches, Santa Clarita at 1.47 inches, Los Angeles International Airport at 1.31 inches, and Covina at 1.29 inches. Long Beach is expected to record just under an inch of precipitation.
Coastal regions face separate hazards. Along beaches in Los Angeles County and the Oxnard region, surf heights of 3 to 6 feet are anticipated through Thursday night, particularly on south- and southwest-facing shores, accompanied by tides ranging from 5.5 to 6.2 feet.
Farther south, the National Weather Service office in San Diego—covering Orange, San Bernardino, Riverside, and San Diego counties—issued a beach hazard warning effective until late Tuesday night. The advisory cautions of dangerous rip currents and breaking waves reaching 3 to 6 feet, with the highest surf concentrated on south- and southwest-facing beaches. Officials warn that these conditions can pull swimmers and surfers out to sea, wash individuals off beaches and coastal rocks, and capsize small watercraft near the shore, prompting a general advisory for swimmers to stay out of the water.
Precipitation probabilities across the southern counties show a sharp increase as the system progresses. On Wednesday morning and afternoon, rain chances stand at approximately 53% in Irvine and Anaheim, 46% in San Clemente, 44% in Ontario, and 40% in Riverside. The likelihood of precipitation climbs significantly by Wednesday evening and into Thursday morning, reaching 95% in Anaheim, Irvine, and San Clemente. Ontario faces a 92% chance, Riverside and Lake Elsinore stand at 91%, and San Bernardino is expected to see an 88% chance of precipitation. Additionally, the San Diego forecast office notes a moderate risk, or a 15% to 25% widespread chance, of thunderstorms across all four southern counties.
