Southern California is bracing for a powerful winter storm expected to deliver several inches of rain, strong winds, and a high risk of flash flooding through Christmas. Officials have issued evacuation warnings, road closures, and flood alerts across multiple counties as an intense atmospheric river moves into the region.
Atmospheric River to Impact Southern California During Christmas Week
A strong atmospheric river system, often referred to as the “Pineapple Express”, is forecast to arrive Tuesday night and intensify through Wednesday and Christmas Day. The storm is drawing deep tropical moisture from the Pacific, significantly increasing the risk of urban flooding, mudslides, and debris flows, especially in recent burn scar areas.
The most affected regions include Los Angeles, Orange, San Bernardino, Riverside, Ventura counties, and surrounding mountain communities.
High Risk of Flash Flooding in Los Angeles Area
Weather officials have designated parts of Southern California under a “high risk” for excessive rainfall and flash flooding, particularly areas north of downtown Los Angeles. Communities facing heightened risk include:
- Burbank
- Altadena
- Glendale
- Santa Clarita
- San Bernardino
- Thousand Oaks
Authorities warn that rapid rainfall accumulation may overwhelm drainage systems, causing flooding in streets, freeways, and low-lying neighborhoods.
Evacuation Warnings Issued for Burn Scar and Flood-Prone Areas
Evacuation warnings and orders are now in effect for hundreds of properties, especially near recent wildfire burn zones such as the Palisades Fire and Eaton Fire areas. Residents are urged to prepare for possible evacuations and to leave early if conditions worsen.
Emergency officials emphasize that evacuation orders indicate immediate or potential danger, while evacuation warnings signal that residents should stay alert and be ready to leave at a moment’s notice.
Road Closures and Travel Warnings Across Southern California
Several major roadways have been closed due to flooding and debris flow concerns. A section of Topanga Canyon Boulevard (State Route 27) has been shut down as a precaution, with no estimated reopening time.
Drivers are strongly advised to:
- Avoid unnecessary travel
- Stay off mountain and canyon roads
- Reduce speed and increase following distance
- Check tires, brakes, lights, and windshield wipers before driving
Officials warn that travel conditions may be especially dangerous overnight and during peak rainfall periods.
Mudslides and Urban Flooding a Major Concern
Emergency management agencies report that mudslides and rock slides are likely in mountainous terrain, while urban flooding is expected in areas with poor drainage. Recent burn scars remain especially vulnerable, as vegetation loss increases runoff and debris flow risks.
Residents in flood-prone zones are encouraged to:
- Use sandbags
- Secure outdoor property
- Monitor emergency alerts
- Register for local evacuation notification systems
Ski Resorts and Outdoor Activities Impacted
Due to severe weather conditions, several Southern California ski resorts have temporarily closed, postponing operations until after the storm passes. Outdoor holiday travel and recreational plans may be significantly disrupted through Christmas.
Officials Urge Residents to Stay Informed and Prepared
Local and county leaders stress the importance of monitoring weather updates, following evacuation guidance, and avoiding travel during peak storm periods. Emergency shelters have been opened for residents who need a safe place during the storm.
Officials warn that storms of this magnitude occur only once every five to ten years, making preparation and caution essential.
What to Expect Next
- Heaviest rain: Tuesday night through Wednesday morning, with another surge on Christmas Day
- Continued flood watches through Thursday evening
- Possible power outages and road closures
- Ongoing evacuation updates as conditions evolve
Residents are encouraged to remain vigilant, prioritize safety, and adjust holiday plans as necessary while Southern California faces this significant winter weather event.
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