Massive Storm Hits Southern California: Flash Flooding and Heavy Rain Expected on Christmas Eve – Here’s What Travelers and Residents Need to Know Now

Published on December 24, 2025

Southern California is gearing up for a massive atmospheric river, known as the “Pineapple Express,” which is expected to bring heavy rain and flash flooding concerns to the region as Christmas approaches. The storm, originating from the Hawaiian Islands, will strike Southern California starting on Tuesday, December 23, 2025, with rain intensifying through Christmas Eve.

This storm, which the National Weather Service (NWS) has classified as high risk for excessive rainfall, is expected to impact Los Angeles, Orange, Riverside, San Bernardino, and Ventura counties. The NWS has issued flash flood warnings and advisories for areas at risk, with forecasts predicting that some communities may see up to 10 inches of rain.

What’s Behind the Storm: The Pineapple Express Arrives

The “Pineapple Express” refers to a weather phenomenon where an atmospheric river flows from the tropics of the Pacific Ocean toward the West Coast. The system picks up moisture from the warm waters of Hawaii and delivers it to the mainland in the form of intense rain and wind. This system is expected to bring significant rain to Southern California, which has been experiencing an unusually dry season in recent months.

With the storm expected to arrive on Tuesday afternoon, rainfall will become heavier overnight and continue into Wednesday, potentially disrupting travel plans and causing hazardous road conditions. Local officials are warning residents to prepare for the worst, as flash flooding and landslides are possible, especially in vulnerable areas affected by recent wildfires.

Flash Flooding Risk: High Alert for Flash Flooding in Several SoCal Areas

The NWS has issued a “high risk” warning for flash flooding in parts of Southern California, particularly in areas just north of Los Angeles, including Burbank, Altadena, Glendale, Santa Clarita, and Thousand Oaks. These areas are expected to receive some of the heaviest rainfall, putting them at a higher risk for flash flooding.

Additionally, areas that have experienced recent wildfires, including parts of Malibu and the Palisades, are also at increased risk for mudslides and debris flows. As a result, local authorities have released evacuation warnings and even orders for specific properties, particularly those in the Palisades, Sunset, and Hurst burn scar areas. Evacuations are set to begin at 11 a.m. on Tuesday and run through 11 p.m. on Thursday.

Evacuation Warnings and Travel Disruptions: How Southern California Is Preparing

With heavy rainfall expected and flooding concerns rising, local government agencies have ramped up their emergency response efforts. Los Angeles County officials have published an interactive evacuation map, providing real-time updates on areas at risk. Residents in the high-risk zones are being urged to heed evacuation warnings as soon as they are issued, and local police are going door-to-door in vulnerable areas to alert residents.

For travelers, Southern California’s airports, including Los Angeles International (LAX) and Bob Hope Airport in Burbank, could see delays or cancellations due to the weather. It’s advisable to check flight statuses in advance and allow extra time for travel to and from airports.

Interstate highways, including I-5, I-10, and I-15, are expected to experience wet conditions, potentially leading to delays and hazardous driving. Motorists are urged to avoid unnecessary travel during the peak storm hours and to monitor traffic reports for updates on road closures or accidents caused by flash flooding.

Rainfall Totals and Temperature Drop Expected

The storm will also bring a significant drop in temperatures across the region. High temperatures are expected to fall into the low 60s by Wednesday, with even cooler conditions continuing through Christmas Day. This abrupt shift in weather will not only affect tourism and travel but will also contribute to the chilly conditions that are already sweeping across California.

Rainfall totals could be historic for some communities, with some areas possibly seeing up to 10 inches of rain, especially in the foothills and mountain areas. The storm’s heavy rain will bring much-needed moisture to the region but also creates an immediate threat to safety and infrastructure.

What to Expect: Safety Precautions for SoCal Residents and Visitors

For residents and visitors in Southern California, preparation is key. Here are some important tips to stay safe during the storm:

1. Monitor Weather Alerts: Stay updated on the latest weather warnings and flood advisories from the NWS and local authorities.
2. Avoid Travel in High-Risk Areas: If you’re in an evacuation zone, leave early and head to a safer location. Avoid traveling through flooded areas, and do not attempt to drive across standing water.
3. Secure Outdoor Items: Wind gusts can be strong with this storm, so secure any outdoor furniture, holiday decorations, or loose items that could be blown away.
4. Prepare for Power Outages: Heavy rain and strong winds often lead to power outages. Have emergency supplies on hand, including flashlights, batteries, and non-perishable food.
5. Follow Local Evacuation Orders: For those in evacuation zones, it’s important to leave as instructed to avoid getting caught in floodwaters or mudslides.

Looking Ahead: Impact on Southern California Tourism and the Region’s Recovery

Southern California has faced multiple natural disasters in recent years, including wildfires and drought conditions. The region is still in the process of rebuilding from previous calamities, and this new storm threatens to set back recovery efforts, particularly for communities already dealing with wildfire damage.

As the storm moves through, both locals and visitors are reminded of the importance of respecting safety warnings, staying informed, and taking proactive measures to protect themselves from potential hazards. While the storm may bring some short-term challenges, it also presents an opportunity for Southern California to demonstrate its resilience and readiness for the challenges of climate-related events.

Conclusion: A Challenging Holiday Season for SoCal Travelers

The upcoming atmospheric river storm, with its heavy rain and flash flooding risk, promises to bring a turbulent Christmas week to Southern California. Residents and travelers alike should remain vigilant, stay informed through local news and official government updates, and take necessary precautions to stay safe during this significant weather event. With the “Pineapple Express” storm making its way to the West Coast, Southern California is bracing for one of its most intense weather events of the season.