While rain in Southern California offers relief to firefighters battling multiple wildfires, heavy downpours on scorched hillsides could trigger toxic ash runoff and mudslides. Officials are urging residents to prepare for potential hazards and take safety precautions as the region grapples with the aftermath of devastating blazes.
After weeks of windy and dry weather, rain has fallen in parched Southern California and is expected to aid firefighters who are mopping up multiple wildfires. But potentially heavy downpours on charred hillsides could bring new troubles such as toxic ash runoff .
Los Angeles County crews spent much of the past week removing vegetation, shoring up slopes and reinforcing roads in devastated areas of the Palisades and Eaton fires, which reduced entire neighborhoods to rubble and ash after breaking out during powerful winds Jan. 7. Most of the region was forecast to get around an inch (about 2.5 centimeters) of precipitation over several days, but “the threat is high enough to prepare for the worst-case scenario” of localized cloudbursts causing mud and debris to flow down hills, the National Weather Service said on social media. “So the problem would be if one of those showers happens to park itself over a burn area,” weather service meteorologist Carol Smith said. “That could be enough to create debris flows.” Rainfall that began late Saturday was expected to increase Sunday and possibly last into early Tuesday, forecasters said. Flood watches were issued for some burn areas, while snow was likely in the mountains. Los Angeles Mayor Karen Bass issued an executive order last week to expedite cleanup efforts and mitigate the environmental impacts of fire-related pollutants. LA County supervisors also approved an emergency motion to install flood-control infrastructure and expedite and remove sediment in fire-impacted areas. Fire crews filled sandbags for communities, while county workers installed barriers and cleared drainage pipes and basins. Officials cautioned that ash in recent burn zones was a toxic mix of incinerated cars, electronics, batteries, building materials, paints, furniture and other household items. It contains pesticides, asbestos, plastics and lead. Residents were urged to wear protective gear while cleaning up. Concerns about post-fire debris flows have been especially high since 2018, when the town of Montecito, up the coast from LA, was ravaged by mudslides after a downpour hit mountain slopes burned bare by a huge blaze. Hundreds of homes were damaged and 23 people died. While the impending wet weather ended weeks of dangerous gusts and reduced humidity, several wildfires were still burning Saturday across Southern California. Those included the Palisades and Eaton fires, which killed at least 28 people and destroyed more than 14,000 structures. Containment of the Palisades Fire reached 81% on Saturday and the Eaton Fire was 95% contained. In northern Los Angeles County, firefighters made significant progress against the Hughes Fire, which prompted evacuations for tens of thousands of people when it erupted on Wednesday in mountains near Lake Castaic. In San Diego County, there was still little containment of the Border 2 Fire as it burned through a remote area of the Otay Mountain Wilderness near the U.S.-Mexico border. The rain was expected to snap a near-record streak of dry weather for Southern California. Much of the region has received less than 5% of the average rainfall for this point in the water year, which began Oct. 1, the Los Angeles Times reported Saturday
Wildfires Rain Mudflows Ash Runoff Debris Flows California Los Angeles Firefighting Safety Precautions
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