California Braces for Rare October Storm, Evacuation Warnings Issued
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A powerful, early-season storm is unleashing heavy rain and potential debris flows across California, prompting evacuation warnings in Los Angeles County and a winter weather advisory for the Sierra Nevada. The system, described as “rare for October” by forecasters, began impacting Northern California on Monday and is now moving southward, raising concerns about hazardous conditions in areas recently scarred by wildfires.
The National Weather Service (NWS) issued warnings Monday evening as the storm approached Southern California. Officials are particularly concerned about the possibility of debris flows – rapidly moving mixtures of water, mud, sand, rocks, and vegetation – in regions burned by recent wildfires. These areas are especially vulnerable due to the lack of vegetation to stabilize the soil.
Burn Scars at High Risk of Debris Flows
The NWS office in Oxnard, California, identified several counties as being at particular risk: San Luis Obispo, Santa Barbara, Ventura, and Los Angeles. Specifically, areas impacted by the Palisades and Eaton fires in January, as well as the Bridge fire in 2024, are facing the greatest threat.
“We’re confident that something will happen somewhere, but where that happens, that’s where the confidence is lower,” a senior meteorologist explained. While widespread debris flows are not expected across all burn scars, the potential for localized, significant impacts remains high. Evacuation warnings signify that hazardous conditions are possible and residents should remain vigilant for potential evacuation orders requiring immediate action.
Rainfall Totals and Regional Impacts
Rainfall totals across California are expected to range from a few tenths of an inch to as much as 3 inches during this multi-day storm. As of 5 p.m. local time on October 13, downtown San Francisco had already recorded 0.68 inches of rain. Northern California is forecast to begin drying out on October 14.
The storm is drawing moisture from the Pacific Ocean, funneling it into the state, according to a meteorologist with the Weather Prediction Centre. While not the most intense moisture event, it is considered atypical for this time of year and carries the potential for “locally high rainfall rates.”
Sierra Nevada Sees First Snowfall of the Season
The storm is also bringing the first measurable snowfall of the season to the Sierra Nevada mountains. A winter weather advisory is in effect through October 15 for the Lake Tahoe Basin, where the highest peaks are predicted to receive up to 2 feet of snow. The heaviest snowfall is anticipated between October 13 and October 14.
“This storm is expected to bring the first measurable snow of the season,” stated a meteorologist with the NWS in Sacramento.
Southern California Braces for Impact
As of 5 p.m. on October 13, the rain had not yet reached Los Angeles County, but forecasters say it is quickly approaching. “It’s raining in San Luis Obispo County right now,” a senior official noted. “We’re expecting it to start pushing further south into the region tonight and into tomorrow morning.” The chance of rain will continue across Central and Southern California through October 14.
The approaching storm serves as a stark reminder of the heightened risks faced by communities near wildfire burn scars, particularly during periods of heavy rainfall. Residents in affected areas are urged to stay informed and heed all warnings and orders issued by local authorities.
