Tuesday, October 14, 2025

When to Expect Peak Rainfall in Southern California

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Rainfall Timeline

The brunt of the storm will arrive Thursday, with widespread rain likely to impact the area for about 36 hours. Pockets of steady rain are possible with moderate to heavy rainfall, especially in mountain communities. Rain will ramp up in the afternoon as the system moves from west to east through the evening and overnight, bringing the highest risk of flooding problems and debris flows in wildfire burn scar areas.

A look at peak rain intensity Thursday, February 13, 2025.

A flash flood watch goes into effect for much of the region at 10 a.m. Thursday through Thursday night. A flash flood watch indicates conditions that could lead to flash flooding. A flash flood warning, which could be issued during the storm, indicates flooding is happening or imminent.

“We’re going to see rain pick up throughout the day, starting in the morning,” said NBC4 meteorologist Shanna Mendiola. “Wet commutes to start. Very wet commute for your evening.”

The rain will turn to showers on Friday, decreasing that afternoon.

  • Thursday morning: Widespread rain, some showers on the heavier side.
  • Thursday midday and into evening: Peak rain intensity, highest risk of flooding problems and burn scar debris flows. Gusty winds are in the forecast.
  • Friday: Lingering showers and mountain snow.

The storm could drop 1.5 to 3 inches across much of the region, with more than 3 to 6 inches in the coastal foothills and mountains.

What to Know

  • The brunt of the storm will bring widespread rain starting Thursday morning with peak intensity expected later in the day.
  • A flash flood watch went into effect for much of the region Thursday morning and will continue into the night.
  • Heavy downpours could trigger slides on hillsides stripped of vegetation by Southern California wildfires.

Flash flood watches went into effect Thursday for Los Angeles and widespread parts of Southern California as a powerful storm brings significant rain to the region.

Scattered light showers spread across the area Wednesday before the flash flood watches that start Thursday morning and continue through the night for most of the Los Angeles area. High rainfall rates could trigger flash flooding and slides in vulnerable burn scar areas, such as Altadena and Pacific Palisades.

Conclusion

The storm will bring significant rain to Southern California, with peak intensity expected on Thursday. It is essential to be prepared for flash flooding and debris flows, especially in areas affected by recent wildfires.

FAQs

* When will the storm arrive, and how long will it last? The storm will arrive on Thursday, with widespread rain expected to last about 36 hours.
* What is the expected rainfall? The storm could drop 1.5 to 3 inches across much of the region, with more than 3 to 6 inches in the coastal foothills and mountains.
* What is the risk of flash flooding and debris flows? Heavy downpours could trigger slides on hillsides stripped of vegetation by Southern California wildfires, and high rainfall rates could trigger flash flooding and debris flows in vulnerable burn scar areas.
* When will the rain turn to showers? The rain will turn to showers on Friday, decreasing that afternoon.

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