Southern California Faces Its Most Powerful Winter Storm: Elevated Risk of Flooding and Debris Flow

Southern California is bracing for its most powerful storm of the winter, which began impacting the region on Wednesday. Meteorologists are particularly concerned about the potential for severe flooding and debris flows, especially in areas recently affected by wildfires. The National Weather Service has issued warnings, indicating that the heaviest rainfall is expected on Thursday, with conditions that could lead to significant hazards.

As the storm approaches, residents in Los Angeles County and surrounding areas are on alert. The National Weather Service has specifically highlighted the risks associated with burn scars from last year’s devastating fires, warning that heavy rains could trigger dangerous debris flows. These flows can occur when saturated soil becomes unstable, resulting in torrents of mud and debris that can rush down hillsides at alarming speeds, threatening homes, vehicles, and infrastructure.

Ryan Kittell, a meteorologist with the Oxnard office of the weather service, emphasized that Thursday is expected to be the most critical day, with strong winds and intense rain. Initial light rains were forecasted for Wednesday, but a more substantial system is expected to arrive later that night or early Thursday morning. The most significant risk for flooding and debris flows is anticipated between midday Thursday and early Friday morning.

Officials have taken steps to mitigate the potential impacts of the storm. In response to past criticisms regarding preparedness for natural disasters, they have worked to clear drainage basins and deploy thousands of sandbags to protect vulnerable areas from flooding. These proactive measures aim to reduce the risks associated with the upcoming storm.

The forecast predicts that burn areas in Los Angeles and Ventura counties could receive between 2 to 5 inches of rain over the storm’s duration. For instance, the Palisades burn scar is expected to see about 3.35 inches, while the Eaton fire scar may receive up to 4.53 inches. Downtown Los Angeles could see approximately 2.09 inches of rain, with other regions like Santa Barbara and San Luis Obispo facing similar levels of precipitation.

In addition to the rain, strong winds are also expected, with gusts reaching up to 53 mph in some areas. These winds pose additional risks, including downed trees and power outages. Officials are urging residents to remain vigilant and to sign up for emergency alerts to stay informed about the latest developments.

As the storm progresses, the weather service will closely monitor rainfall rates, particularly in burn areas, where even half an inch of rain per hour can trigger debris flows. The situation remains dynamic, and residents are advised to exercise caution, especially if evacuation orders are issued.

After this storm passes, the forecast suggests a return to drier conditions, with no significant rain expected for the remainder of February. As Southern California prepares for this weather event, the focus remains on ensuring the safety and well-being of residents in the face of nature’s unpredictability.