Southern California is known for its sunshine and mild winters, but this year, residents may need to prepare for something considerably wetter.
According to the National Oceanic and Atmospheric Administration (NOAA), a strong to very strong El Niño is likely to continue through the winter of 2026–2027. This weather pattern increases the possibility of above-average rainfall and significant storm activity across portions of California.While a wetter winter isn’t guaranteed, emergency management officials and utility providers are urging residents to take precautions before the first major storms arrive.
What Is El Niño, and Why Does It Matter?
El Niño is a naturally occurring climate pattern characterized by unusually warm ocean temperatures in the central and eastern tropical Pacific Ocean. These changing ocean conditions can influence weather patterns across the globe, including rainfall and storm activity in the United States.For Southern California, strong El Niño events can increase the likelihood of wetter winter conditions, although individual storms and local rainfall amounts remain difficult to predict months in advance.
In its October 8, 2026, advisory, NOAA’s Climate Prediction Center reported that El Niño was continuing to strengthen, with a greater than 83% probability of strong to very strong conditions persisting through January–March 2027.That doesn’t necessarily mean it will rain every day. Rather, it means communities should prepare for the possibility of prolonged rainfall, powerful storms, and localized flooding.
Why Southern California Residents Should Pay Attention
The potential effects of El Niño extend beyond an inconvenience during the morning commute. Periods of intense rainfall can create hazardous conditions throughout Riverside, San Bernardino, Los Angeles, Orange, and surrounding counties.
Some of the most significant concerns include:
- Flash flooding: Heavy rainfall can overwhelm storm drains and flood streets, intersections, and low-lying neighborhoods.
- Mudslides and debris flows: Hillsides and areas affected by recent wildfires can become particularly vulnerable when heavy rain saturates the ground.
- Power outages: Strong winds, falling branches, and storm-related damage can interrupt electrical service.
- Road closures: Flooded roadways, fallen trees, and damaged infrastructure can affect travel and emergency access.
- Coastal flooding and erosion: Communities near the ocean may experience increased risks from large waves, elevated water levels, and storm activity.
California officials are already preparing. In September 2026, Governor Gavin Newsom issued an emergency proclamation to support early coordination and storm preparedness efforts across the state. The California Department of Water Resources has also begun staging flood-fighting supplies, including sandbags and portable flood barriers, in anticipation of potential winter storms.
Five Ways to Prepare Your Home and Family
The good news is that preparing for winter weather doesn’t have to be complicated or expensive. A few proactive steps can help reduce risks and make unexpected disruptions easier to manage.
1. Inspect and Protect Your Home
Before heavy rainfall arrives, inspect your property for potential vulnerabilities. Clear leaves and debris from gutters, downspouts, and drainage areas. Check for roof leaks and secure patio furniture, decorations, and other outdoor items that strong winds could displace.
If your property is located near a hillside, canyon, or recently burned area, review your local flood and landslide risks. Residents should also avoid trimming trees near electrical lines. Contact the appropriate utility provider if hazardous vegetation threatens nearby power infrastructure.
2. Build an Emergency Preparedness Kit
Southern California Edison recommends keeping enough basic supplies to support your household for at least three days.
Your emergency kit should include:
- Drinking water and nonperishable food
- Prescription medications and first aid supplies
- Flashlights and extra batteries
- Portable phone chargers and a battery-operated radio
- Important documents stored in waterproof containers
- Personal hygiene products and basic sanitation supplies
- Baby essentials and pet food, when applicable
- A small amount of emergency cash
- Consider keeping a smaller emergency kit in your vehicle as well.
3. Prepare for Possible Power Outages
A storm-related power outage can affect everything from lighting and refrigeration to communication and medical equipment. Charge electronic devices before severe weather arrives, keep portable battery packs available, and familiarize yourself with your utility provider’s outage reporting system. Southern California Edison customers can register for outage alerts and monitor service interruptions through sce.com/outages. Remember: Never operate generators indoors, inside garages, or near windows and doors. Generators produce carbon monoxide, an invisible and potentially deadly gas.
If you encounter a downed power line, assume it is energized. Stay at least 100 feet away and immediately call 911.
4. Create a Family Emergency Plan
Emergencies can happen when family members are at work, children are at school, or loved ones are traveling. Establish a communication plan that includes an emergency meeting location and a trusted out-of-area contact. Make sure everyone knows how to access important phone numbers, emergency supplies, and evacuation information. Families with young children, older adults, individuals with disabilities, or household members who rely on powered medical equipment should consider their specific needs when planning.
5. Stay Informed and Avoid Flooded Roads
Weather conditions can change rapidly during major storms. Sign up for local emergency notifications and monitor reliable weather forecasts, including updates from the National Weather Service. Never attempt to drive or walk through flooded roadways. Floodwater can conceal dangerous currents, washed-out pavement, and other hazards. If you encounter flooding while driving, turn around and find another route.
Preparedness Is a Community Responsibility
Storm preparedness doesn’t stop at our front doors. Checking on elderly neighbors, sharing reliable emergency information, and helping vulnerable community members prepare can make a meaningful difference when severe weather arrives. Community organizations, neighborhood associations, schools, and local agencies also play an important role in connecting residents with emergency resources and preparedness education. Even small actions, such as helping a neighbor clear a storm drain or identify their nearest emergency shelter, can contribute to a safer and more resilient community.
Don’t Wait Until the Rain Starts
The 2026–2027 El Niño season serves as an important reminder that preparation is one of the most effective ways to reduce the impact of natural hazards. Although no seasonal forecast can predict exactly how much rain a particular neighborhood will receive, the possibility of severe storms makes early planning worthwhile. Take time now to inspect your home, review your emergency supplies, develop a family safety plan, and stay connected to trusted weather and emergency information sources.
A little preparation today can make a significant difference tomorrow. Stay informed. Stay prepared. Stay safe.