Published on November 14, 2025
By: Paramita Sarkar
A major winter storm is set to impact Southern California from Los Angeles to San Diego, with flood watches issued for the entire region from Friday, November 14, through Sunday, November 16. This storm is expected to bring significant rainfall, ranging from 2-5 inches in metro areas, with some mountain regions seeing up to 10 inches of rain. The storm will not only threaten the region with flooding but also create significant travel disruptions, including hazardous road conditions and flight delays, particularly in Los Angeles, Orange County, and San Diego.
The first wave of rain will hit late Thursday, November 13, continuing into Friday morning, followed by a more intense second wave over the weekend. Southern Californians are urged to take precautions, as the heavy rainfall could cause flash flooding, especially in burn scar areas, and create dangerous travel conditions across major highways.

What Is the Timeline for the Storm?

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The storm will strike Southern California in two main phases. The first burst of rain will begin Thursday night, November 13, continuing into Friday morning. This initial round is expected to bring 1-3 inches of rain, with the heaviest rainfall occurring west of Los Angeles County, including Ventura and Santa Barbara. Commuters should expect wet road conditions, delays, and possibly flash flooding during Friday’s rush hour.
The second, and more intense, wave of the storm will occur from Saturday, November 15, to Sunday, November 16. This round will impact the entire region, including Los Angeles, Orange County, and San Diego. Residents and travelers can expect 3-6 inches of rain in these areas, while San Diego may see up to 3 inches. Thunderstorms are expected, bringing gusty winds, hail, and the potential for weak tornadoes in coastal areas. Travel delays are expected to be widespread, with heavy rainfall and strong winds possibly affecting airports, highways, and public transport.

Where Is the Storm Impacting?

Flood watches cover a broad area, stretching from Santa Barbara in the north to San Diego in the south. Los Angeles, Orange County, Riverside, and San Bernardino counties will see the heaviest rain, with 3-6 inches expected across most of these areas. The mountainous regions will bear the brunt of the storm, with up to 10 inches of rain expected, along with snow at higher elevations. Snow levels are expected to drop to 5,000 feet, and 1-2 feet of snow could accumulate, adding to the hazards for mountain travelers.
The primary concern is flooding, especially in burn scar areas, where recent wildfires have left the soil vulnerable to rapid runoff. Evacuations have already been ordered for residents in these areas, and those traveling through these regions should be prepared for closures and hazardous conditions on roads such as I-5 and other major routes.

Why Is This Storm Particularly Dangerous?

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This storm system, described as a major atmospheric river event, poses a significant flooding risk, particularly in vulnerable areas like burn scars, where debris flows and mudslides are a high concern. The National Weather Service (NWS) has issued urgent flood warnings for parts of Southern California, emphasizing the risk of flash flooding in low-lying areas and on roadways prone to flooding.
Along with the risk of flooding, the storm will also bring severe weather in the form of thunderstorms, which could bring heavy downpours, strong winds up to 60 mph, and hail. These conditions will increase the risk of power outages and travel disruptions across the region, making it critical for residents and travelers to stay updated and take precautions ahead of the storm.

How Will This Impact Travel?

The storm is expected to cause significant travel disruptions, both on the roads and at airports. Drivers in Southern California should expect wet roads, reduced visibility, and the possibility of flash flooding on major highways, including I-5 and other routes near rivers and burn scar zones. Travel delays and closures are anticipated, particularly for those heading into the mountains or along coastal roads.
Air travel will also be impacted, as heavy rain and thunderstorms could cause delays and cancellations at airports in Los Angeles, San Diego, and Orange County. Travelers are advised to check flight statuses in advance and be prepared for the possibility of rebookings, especially for those flying during the peak storm periods over the weekend.

What Are the Flood Risks in Specific Areas?

Flood risks will vary across Southern California, with some areas facing higher levels of danger due to the combination of heavy rainfall and the potential for strong winds and thunderstorms:

• Los Angeles Metro: Up to 5 inches of rain is expected in Los Angeles, with the possibility of localized flooding, especially in low-lying areas and regions near urban waterways. Burn scar areas in the foothills could see significant debris flows.
• Orange County North: Between 3-6 inches of rain is expected, with the potential for severe thunderstorms. Flash flooding is a concern, particularly in flood-prone areas.
• San Diego: San Diego will receive 2-3 inches of rain, with moderate to high flooding risks in areas with poor drainage systems. Residents should be cautious when traveling in the city and surrounding areas.
• Mountains and Foothills: The mountains could receive up to 10 inches of rain, along with significant snow. This area has the highest risk for debris flows and avalanches, so travelers should avoid mountain routes.

How Can Residents Prepare for the Storm?

The National Weather Service recommends several precautions for residents and travelers in Southern California:

• Clear Storm Drains: Residents should clear debris from gutters and storm drains around their homes to prevent localized flooding.
• Follow Evacuation Orders: Residents in burn scar zones should follow evacuation orders to ensure safety from potential debris flows.
• Travel Precautions: If possible, avoid travel during the peak storm periods from Friday to Sunday. If travel is necessary, prepare for hazardous driving conditions and possible delays.
• Emergency Supplies: Residents should prepare for power outages by having flashlights, batteries, and emergency supplies on hand.

How Long Will the Storm Last?

The storm is expected to last until Sunday, November 16, with heavy rain tapering off by Monday morning. However, additional storms are forecast to impact California early next week, continuing the wet weather pattern. Southern Californians should remain vigilant for any updates from the NWS.

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Tags: flood watch, LA to San Diego storm, Southern California winter storm, Travel Disruption, winter storm flooding

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