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News / Weather

Southern California Braces for Intense Atmospheric River: Flood and Mudslide Risks

Southern California is bracing for a significant atmospheric river storm expected to peak on Saturday, November 15, 2025. The storm poses a substantial risk of flooding, mudslides, and debris flows, especially in areas recently scarred by w...

Southern California Storm Forecast to Bring Heavy Rain and Flood Risk
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Southern California Braces for Intense Atmospheric River: Flood and Mudslide Risks Image via The New York Times

Key Insights

  • **Flood Watch:** A flood watch is in effect for approximately 20 million people across Los Angeles, Ventura, Santa Barbara, Orange, San Diego, Riverside, and San Bernardino counties until 10 p.m. Saturday.
  • **Burn Scar Risks:** Areas near recent burn scars, including Eaton, Palisades, Kenneth, Sunset, Hurst, and Airport fires, are at high risk for mud and debris flows, leading to evacuation warnings and orders.
  • **Heavy Rainfall:** Downtown Los Angeles could experience its wettest November since 1985 if rainfall predictions hold true. The storm could deliver one-fifth of the city's annual average rainfall in a single weekend.
  • **Storm Characteristics:** This atmospheric river is characterized by a 'cut-off low,' making it less predictable than typical storms. It may stall over Southern California, prolonging heavy rainfall.
  • **Safety Measures:** Residents are advised to avoid nonessential travel, never drive through flooded roadways, and stay away from downed power lines. Emergency shelters have been opened to support those affected by evacuation orders and flooding.

In-Depth Analysis

The atmospheric river impacting Southern California is unique due to its 'cut-off low' nature, making it harder to predict than typical storms pushed by the jet stream. This system could stall over the region, leading to prolonged periods of intense rainfall. The primary concerns revolve around areas destabilized by recent wildfires, where the lack of vegetation increases the risk of mudslides and debris flows.

**Burn Scar Areas at Risk:**

  • **Eaton Burn Scar (Altadena)**
  • **Palisades Burn Scar (Pacific Palisades)**
  • **Bridge Burn Scar (North of Claremont)**
  • **Line Burn Scar (North of Highland)**
  • **Airport Burn Scar (Between Rancho Santa Margarita and Lake Elsinore)**

**How to Prepare:**

  • **Monitor Weather Alerts:** Stay updated with the latest alerts and warnings from the National Weather Service.
  • **Prepare for Evacuation:** If you live near a burn scar, pack a go-bag with essential supplies and be ready to evacuate if ordered.
  • **Clear Gutters and Drainage:** Ensure gutters and drainage systems are clear to minimize water buildup around your property.
  • **Sandbags:** Utilize sandbags to divert water and mud flows away from your home.
  • **Emergency Kit:** Have an emergency kit with non-perishable food, water, flashlights, and batteries.

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FAQ

- **Q: What is an atmospheric river?

- **Q: What should I do if I am under an evacuation order?

- **Q: How can I stay informed about the storm's progress?

Takeaways

  • The atmospheric river poses a significant threat to Southern California, particularly in areas affected by recent wildfires.
  • Residents should stay informed, take necessary precautions, and be prepared to evacuate if ordered.
  • The storm's unpredictable nature requires vigilance and proactive safety measures to mitigate potential risks.

Discussion

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Sources

Disclaimer

This article was compiled by Yanuki using publicly available data and trending information. The content may summarize or reference third-party sources that have not been independently verified. While we aim to provide timely and accurate insights, the information presented may be incomplete or outdated.

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