A powerful winter storm is pushing into Southern California, bringing heavy rain, flash-flood risks, and major travel delays from Los Angeles to San Diego. The system will move through the region from Thursday night through Sunday, dropping widespread rain, strong winds, and even mountain snow. Authorities urge residents and travelers to prepare early, as the impacts are expected to be severe and fast-moving.
Two Storm Waves Expected
The storm will roll in two main phases. The first starts late Thursday and continues into Friday morning. This round will bring steady rain, slick roads, and early flooding in some urban areas. Rain totals during this phase may reach 1 to 3 inches, especially near Ventura, Santa Barbara, and western Los Angeles County.
The second wave will be stronger and more widespread. It will hit Saturday and last through Sunday. This round will bring heavy rain, thunderstorms, and damaging winds across Los Angeles, Orange County, the Inland Empire, and San Diego. Many areas could see 3 to 6 inches of rain by Sunday night. Lightning, hail, and isolated weak tornadoes are also possible near the coast.
Regions at Highest Risk
A flood watch covers the region from Santa Barbara to San Diego. Heavy rain will reach coastal cities, valleys, and foothills, while the mountains will see the most intense impacts. Some high-elevation areas may get up to 10 inches of rain, along with 1 to 2 feet of snow above 5,000 feet.
These conditions may lead to road closures, reduced visibility, and dangerous driving conditions on major routes, including the I-5 corridor, mountain passes, and canyon roads.
Burn Scar Zones on Alert
Recent wildfire burn scars are especially vulnerable. With soil unable to absorb water quickly, debris flows and mudslides can form on short notice. This threat is highest in foothill communities across Los Angeles, Ventura, Orange, Riverside, and San Bernardino counties. Some communities have already received evacuation warnings, and officials may issue additional mandatory orders as rainfall intensifies.
Why the Storm Is Dangerous
This system is fueled by a strong atmospheric river, which funnels deep tropical moisture into California. The result is long periods of intense rainfall, rapid runoff, and flooding in areas that usually drain slowly.
Thunderstorms this weekend will heighten the danger. Strong wind gusts up to 60 mph could lead to tree damage and power outages. Low-lying roads, underpasses, and intersections with poor drainage may flood within minutes. Residents should avoid walking or driving through standing water, as depth and current strength can be deceiving.
Major Travel Disruptions Expected
Travel across Southern California will be difficult from Friday through Sunday. Drivers should expect slow traffic, road flooding, and sudden lane closures. Highways near rivers, beaches, and foothills will be especially hazardous.
Coastal roads may see localized flooding, while mountain routes could face chain requirements or complete closures due to heavy snow and rockslides.
Airport Delays Likely
Airports in Los Angeles, Orange County, and San Diego may experience delays or cancellations during peak rainfall. Thunderstorms and low visibility could disrupt schedules throughout the weekend. Travelers should monitor flight updates closely and allow extra time for airport security and congestion.
Local Flood Risks
Impacts will vary by region:
Los Angeles Metro
Up to 5 inches of rain may fall across Los Angeles. Urban flooding is likely, especially near storm drains, rivers, and low-lying neighborhoods. Foothill burn scar areas face high debris-flow risks.
Orange County
Rain totals may reach 3 to 6 inches. Thunderstorms are likely, bringing lightning and strong winds. Flash floods may hit areas with narrow drainage channels or flood-prone intersections.
San Diego County
Rainfall will range from 2 to 3 inches. Flooding may develop quickly in coastal neighborhoods, canyons, and older drainage zones. Inland areas could see gusty winds and brief thunderstorms.
Mountain Communities
Up to 10 inches of rain and significant snowfall could create dangerous travel conditions. Avalanche risks increase at higher elevations, and tourism areas may see road closures.
How Residents Can Prepare
Officials recommend taking early action as conditions may worsen without warning.
Clear Drains and Gutters
Remove leaves and debris to prevent overflow. Keep sandbags ready if you live in a flood-prone zone.
Follow Evacuation Notices
Residents near burn scars should leave when instructed. Debris flows move fast and with little warning.
Limit Travel During Peak Storm Hours
If driving is necessary, keep your headlights on, drive slowly, and avoid flooded roads.
Prepare for Power Outages
Charge phones, gather flashlights, and secure outdoor items that could blow away.
Stock Up on Essentials
Have water, non-perishable food, and basic supplies ready for disruptions that may last several days.
How Long the Storm Will Last
Rain will taper off by late Sunday night. Drier weather is expected on Monday, though forecasters warn that additional storms could arrive early next week. The overall weather pattern indicates Southern California may face multiple rounds of rain throughout the month.
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