Southern California faces a coastal flood hazard as the National Weather Service issues a formal advisory for low-lying beach communities, island shores, and harbor walkways starting Monday morning. Moderate sea water inundation is likely to impact vulnerable infrastructure, including beach parking lots, bike paths, and coastal access points during peak high tide cycles.
National Weather Service Issues Southern California Coastal Flood Advisory
The National Weather Service office in Los Angeles and Oxnard released a coastal flood advisory at 1:02 p.m. on Saturday, setting the active window from Monday at 5 a.m. until Tuesday at 5 p.m. The advisory covers Catalina and Santa Barbara Islands, the Malibu Coast, Ventura County Beaches, and Los Angeles County shores. According to the National Weather Service, areas of primary concern include Avalon, Long Beach, the Peninsula, and Belmont Shore.
Forecasters report that while the incoming surf will likely remain smaller than the swells generated by Hurricane Marie earlier this month, lingering coastal erosion has amplified vulnerability across the region. This compromised shoreline leaves low-lying properties exposed to locally significant flooding and structural damage during tidal peaks.
Expected Impacts on Vulnerable Coastal Infrastructure
Moderate flooding of sea water is projected to inundate vulnerable coastal zones, creating hazardous conditions for pedestrians, motorists, and maritime operators. Beach parking lots, bicycle paths, and harbor walkways face significant water accumulation around high tide cycles.
The National Weather Service warns of severe beach erosion and potential localized damage to vulnerable coastal structures. Strong rip currents present an elevated risk of ocean drowning, capable of pulling swimmers and surfers out to sea. Large breaking waves can cause physical injury, sweep individuals off beaches and rock jetties, and capsize small watercraft operating near the shoreline.
Safety Guidelines and Evacuation Protocols for Flood Zones
Residents and campers situated in flood-prone, low-lying areas should prepare to take immediate action and seek higher ground when instructed. Safety officials urge the public to follow evacuation orders without delay, secure homes if time permits, and disconnect utilities and appliances before departure.
Flood safety precautions issued by emergency authorities include:
- Avoid entering basements or rooms where electrical outlets or cords are submerged in water.
- Evacuate immediately upon hearing buzzing, crackling, snapping, or popping sounds, or if sparks are visible.
- Refrain from walking or driving through floodwaters; as little as six inches of moving water can knock an adult off their feet, and 12 inches of fast-flowing water can carry away most vehicles.
- Stay out of the water and off rock jetties, which become deadly during heavy surf conditions.
- Move to the highest possible point and contact emergency services by dialing 911 if trapped by moving water.
Rainy Weather Driving Precautions and Hydroplaning Hazards
Wet weather accompanying the coastal advisory introduces severe driving hazards across regional roadways. Motorists must never drive around barricades or through water of unknown depth. When approaching a flooded road, drivers should turn around immediately, as flash flood currents possess enough strength to sweep vehicles off roadways.
To maintain vehicle control during heavy rainfall, drivers should turn on headlights to enhance visibility, travel in middle lanes on higher ground where rainwater accumulation is minimized, and maintain a safe following distance from large trucks and buses that generate water spray. Puddles and standing water must be avoided to prevent hydroplaning.
Hydroplaning occurs when vehicle tires encounter a layer of water on the road surface faster than the tire treads can displace it, creating a water barrier that lifts the vehicle and causes a complete loss of steering and braking control. Contributing factors include excessive vehicle speed, increased water depth, and worn tire tread depth. In the event of hydroplaning, drivers should ease off the accelerator, gently turn the steering wheel into the direction of the skid, and wait for the tires to reconnect with the pavement before straightening the wheels.