L.A. heat wave, humidity follow Tropical Storm Marie

Key Points:

• Southern California is facing extreme heat and high humidity following coastal flooding and high surf caused by remnants of Tropical Storm Marie, with temperatures expected to rise 10 to 20 degrees above normal by Tuesday and Wednesday.
• Nighttime temperatures will remain uncomfortably warm in the mid-70s, increasing heat stress combined with lingering moisture from the storm, prompting a heat advisory for Wednesday and Thursday from the National Weather Service.
• Coastal flooding and dangerous high surf advisories remain until Tuesday night, with strong rip currents posing life-threatening risks to swimmers and small boats; emergency responders have reported significant beach closures, flooding, and power outages in affected areas like Long Beach and Malibu.
• The unusually high tides, reaching up to 7.2 feet due to warm ocean temperatures and a developing El Niño, have exacerbated flooding and wave impact, with high swells coinciding with higher-than-normal tides causing extensive shoreline damage.
• Public health officials advise avoiding ocean swimming through Wednesday due to elevated bacteria levels from recent rainfall runoff, recommending a 72-hour to five-day wait after rain before entering the water to reduce health risks.