Debris Flow Threat for Southwest California

news image
Top Stories
18 Mar 2018 7:10 PM
All eyes continue to be on a strong storm system that will be making its way into Southwest California Tuesday through Thursday night. An atmospheric river, or an intense plume of moisture out over the Pacific Ocean, will supply the approaching system with enough water to likely produce some of the highest rainfall totals so far this season for this area. https://twitter.com/twitter/statuses/975545834807808000 The heaviest of the rain is expected to fall between late Tuesday night and early Thursday We could see peak rainfall rates between 0.50-0.75" per hour, which could lead to an increased threat of flash flooding/debris flows in the Thomas, Whittier, Creek, and La Tuna burn scar areas. https://www.facebook.com/WeatherNation/videos/10156232567654874/ Pre-Evacuation advisories are already in effect for some cities in and near these burn scar locations. https://twitter.com/countyofsb/status/975177158653022208 Storm totals are forecast to be between 1-4" for the coasts and valleys and up to 6" possible in the foothills and mountains. In addition to a concern for the recent burn areas, other impacts include widespread flooding across the entire region and rockslides in/near canyons. Check in with your local emergency managers for the latest evacuation notices prior to this storm. For WeatherNation, I'm Meteorologist Meredith Garofalo
All Weather News
More
Blizzard - Nor'easter Takes Aim at the Atlantic Coast

Blizzard - Nor'easter Takes Aim at the Atlantic Coast

Storms have seemingly been drawn to the North

23 Feb 2026 11:10 AM
Elevated Fire Danger: FL, LA, MS, NM, CO, TX

Elevated Fire Danger: FL, LA, MS, NM, CO, TX

While temperatures will cool across the South

23 Feb 2026 10:40 AM
Next Pacific System Brings Flood Potential To Oregon & California

Next Pacific System Brings Flood Potential To Oregon & California

Inches of rain and feet of snow fell across t

23 Feb 2026 3:00 AM
Strong Storms Target the Southeast

Strong Storms Target the Southeast

A developing storm system is expected to brin

21 Feb 2026 7:55 PM
New England Snow & Ice Into Saturday

New England Snow & Ice Into Saturday

Snow has become more widespread across Upstat

21 Feb 2026 3:15 AM
Major Storm System Winds Down in California

Major Storm System Winds Down in California

CALIFORNIA - After almost a week of relentles

21 Feb 2026 3:10 AM
Wildfire Danger: Red Flag Warnings Persist Into Saturday

Wildfire Danger: Red Flag Warnings Persist Into Saturday

PLAINS - Multiple active fires broke out earl

21 Feb 2026 3:00 AM