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The Brief

The most important stories for you to know today
  • Project to connect major venues
    A group of mostly 49ers fans gathers at the corner of an intersection near SoFi Stadium. Driving by them is a white bus that says SHUTTLE on it.They are standing in front of a shopping center with a cleaners, a nail salon, a barber shop, and a restaurant. Palm trees line the street behind them.
    People wait to cross S. Prairie Ave outside of SoFi Stadium on Jan. 30, 2022 in Inglewood. The proposed Inglewood Transit Connector will connect people from Metro’s K Line to destinations such Sofi Stadium and is designed to ease neighborhood disruptions.

    Topline:

    The federal government has pledged more than $1 billion for a 1.6-mile, three station, “automated people mover” that will connect people from Metro’s K Line to destinations such as the Kia Forum, Sofi Stadium, YouTube Theater and the Intuit Dome.

    Why it matters: The Inglewood Transit Connector, slated to be completed in time for the 2028 L.A. Olympics, has been designed to carry 11,000 riders an hour. According to the city, around 400 annual events take place at the sports and entertainment destinations.

    Why now: The transit connector is designed to ease traffic congestion and neighborhood disruptions during sporting and entertainment events and encourage the use of public transit to reduce greenhouse gas emissions.

    The backstory: The project’s construction will displace 41 local businesses and since it’s publicly funded, the city has said it will provide relocation funds for the affected businesses.

    The federal government has pledged more than $1 billion toward a 1.6-mile, three station, “automated people mover” that will connect people from Metro’s K Line to destinations such as the Kia Forum, Sofi Stadium, YouTube Theater and the Intuit Dome.

    The Inglewood Transit Connector, slated to be completed in time for the 2028 L.A. Olympics, has been designed to carry 11,000 riders an hour. According to the city, around 400 annual events take place at the sports and entertainment destinations.

    Funding is coming from the Federal Transit Administration’s (FTA) Capital Investment Grant (CIG) program, which will foot half the bill for the project.

    The city has already secured $873 million from different funding sources.

    “This is a good day for the people of Inglewood and the entire region,” Inglewood Mayor James T. Butts said in a statement. “By signaling their commitment to invest significantly in our project, the federal government is recognizing the importance of providing better transportation options for our residents and to everyone in our region who wants to work and visit our city and its outstanding sports, entertainment, and commercial facilities.”

    The transit connector is designed to ease traffic congestion and neighborhood disruptions during sporting and entertainment events and encourage the use of public transit to reduce greenhouse gas emissions.

    However, the project’s construction will displace 41 local businesses and since it’s publicly funded, the city has said it will provide relocation funds for the affected businesses.

  • What to do when porch pirates steal your meds

    Topline:

    The Postal Service report estimated that at least 58 million packages were stolen in 2024. What are the odds that one of those packages has medication in it? Here's what to do if your medication gets stolen.

    Lower your theft risk: Schedule deliveries for when you're home and having a delivery spot that's hidden are good ideas. Even a locker for your porch that doesn't lock is a good deterrent. If your medication is stolen, report the theft to your prescribing doctor and local law enforcement.

    Check your pharmacy's policies: CVS Caremark, another company that ships prescriptions by mail, said it offers customers package tracking to prevent theft, but didn't answer NPR's question about how common medication theft is. Pharmacies, including Walgreens, say they offer order tracking and use discreet packaging to help prevent theft. Customers can also opt to require a signature when their medicines are delivered.

    Carmen Peterson's son Ethan is a big fan of Elmo and Mickey Mouse Clubhouse. And although Ethan is nonverbal, he loves to sing along in his own way.

    "He's a really fun-loving 8-year-old. He doesn't speak, but he gets his point across," Peterson says.

    Ethan has a rare genetic disorder — Syngap1 — which, among other things, causes a kind of seizure that can make him drop to the ground without warning.

    "Everything just kind of shorts out for a moment," Peterson says. "And the danger of that — and I've seen this — is him falling on hardwood floors, concrete, off of stairs, like all of these things."

    She says he's gotten hurt and she's had to rush him to the emergency room.

    Ethan takes a medicine called Epidiolex that prevents these seizures. But last holiday season, a thief stole it off the family's front porch in Charlotte, N.C.

    Peterson remembers finding the empty box and then checking her Ring doorbell camera footage. "I see this guy walking off … and I am just livid," she says.

    Then, she had to figure out how to get this medicine — worth $1,800 — replaced so her son didn't miss a dose. It turned out to be a challenge.

    How many stolen packages?

    December is a busy time for package deliveries and for porch pirates who steal them. Sometimes the thieves run off with mail-order medication instead of getting an iPad or a Labubu.

    E-commerce took off during the pandemic, and December remains the busiest time of the year for package deliveries, according to the U.S. Postal Service.

    Still, it can be tricky to get the whole picture when it comes to package theft.

    As easy as it is to buy stuff online, getting it to customers is actually really complicated. That's because so many people and companies interact with a package before it's delivered, according to Ben Stickle, a professor of criminal justice administration at Middle Tennessee University.

    "So it's really hard to get, you know, what happens from the point that you click a button to when it gets delivered, all put back together with enough detail to find out when and where these thefts are occurring and then actually do something about it," he says.

    Stickle worked on a study with the Postal Service published earlier this year, and says that victims of theft wind up reporting it to different places that don't share information with each other or even necessarily record the missing package as "theft." And sometimes victims don't report it at all.

    "There's a lot of packages stolen," he says, explaining that according to security research company SafeWise, it's about 250,000 packages every day. Stickle has worked with SafeWise.

    The Postal Service report estimated that at least 58 million packages were stolen in 2024. "So what are the odds that one of those, unbeknownst to the thief, has some type of medication in it?" Nobody really knows for sure, he says.

    Ways to lower theft risk

    So what can you do? Stickle says scheduling deliveries for when you're home and having a delivery spot that's hidden are good ideas. Even a locker for your porch that doesn't lock is a good deterrent.

    "If a thief can see that there's a package, even if it's an envelope on your porch from the roadway, it seems to be far more likely that it's going to be stolen," he says.

    According to Express Scripts and Optum Rx, which are two companies that offer mail-order pharmacy services, medication theft is pretty rare.

    CVS Caremark, another company that ships prescriptions by mail, said it offers customers package tracking to prevent theft, but didn't answer NPR's question about how common medication theft is.

    Pharmacies, including Walgreens, say they offer order tracking and use discreet packaging to help prevent theft. Customers can also opt to require a signature when their medicines are delivered.

    Making sure patients don't miss a dose is a top priority, says Stryker Awtry, the director of Loss Prevention and Transformation for Optum Pharmacy, part of Optum Rx.

    "Especially during the holiday seasons when deliveries surge, we want to make sure we build in peace of mind for our customers," he says. "So if a theft were to happen, No. 1, contact the pharmacy right away."

    He says to also report the theft to your prescribing doctor and local law enforcement.

    A lost prescription replaced  

    As for Carmen Peterson in North Carolina, when she called her insurer's pharmacy to get Ethan's medicine replaced, the answer was no. But Ethan missing a dose and having a seizure that put him in the emergency room again? Not an option for her.

    "It's just like it's one of those things that you just don't have a choice," she says.

    If forced to, she would have found the money to buy the medicine herself.

    "It was just unfortunate that the … company was so ready and kind of willing to just wash their hands of it because they felt like they had done what they were contracted to do, which is deliver the medication."

    That company, Liviniti Pharmacy, said it couldn't comment on the Peterson family's experience because of patient privacy laws.

    Unwilling to give up, Peterson reported the theft everywhere and made noise about it — including on her local news stations. That worked. Jazz Pharmaceuticals, the company that makes the drug Ethan needs, saw the stories and replaced it for her within a week.

    Now, she recommends getting important medicines delivered to a P.O. box, a workplace or just going to the pharmacy to pick it up yourself.

    Copyright 2025 NPR

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  • Eligible students will gain entry to 16 campuses
    A lit up sign says CSUDH and sits on a small lawn between some palm trees.

    Topline:

    After a pilot to automatically admit high school students into the California State University system in the Inland Empire county took off last fall, lawmakers this year passed a law to greenlight a similar program statewide next fall.

    About the program: Starting next fall, all students in California will be eligible for an automatic admissions program at 16 of the 22 Cal State campuses. The program doesn’t mean students can enter any major at the campuses they pick. Some majors may require students to show higher high school grades or tougher courses if those programs have fewer openings than student demand. For Californians, the standard minimum GPA for entry is 2.5 in a series of college-preparatory courses.

    The backstory: Leaders at the California State University last year launched a pilot in Riverside County to attract more students to the university system and to steer some to campuses that have been struggling with enrollment declines. High school counselors told CalMatters that the Riverside County pilot encouraged students who never considered attending a university to follow through with the automatic admissions process.

    What’s good for Riverside County is good for the whole state: After a pilot to automatically admit high school students into the California State University system in the Inland Empire county took off last fall, lawmakers this year passed a law to greenlight a similar program statewide next fall.

    Leaders at the California State University last year launched the pilot to attract more students to the university system and to steer some to campuses that have been struggling with enrollment declines.

    The pilot worked like this: University officials and high schools in Riverside County pored over student course completion and grade data to identify every county high school senior who was eligible for admission to the 10 of 22 Cal State campuses chosen for the pilot. Then the students received a brochure in the mail last fall before the Nov. 30 submission deadline, plus digital correspondence, telling them they were provisionally admitted as long as they submitted an application to one or more Cal State campuses, even those not in the pilot, and maintained their high school grades.

    Starting next fall, all students in California will be eligible for the automatic admissions program, which will expand the roster of participating Cal State campuses to 16. Cal State will release more information on the program’s implementation in February, its website says.

    In justifying the expanded program during a legislative hearing, bill author Sen. Christopher Cabaldon, a Democrat from Napa, said college should be as seamless a transition from high school as it is for students finishing one grade and advancing to the next. “It's entirely an invention of us, the gap between 12th grade and college. … The same gap does not exist between elementary school and junior high or junior high and high school.”

    The legislation, Senate Bill 640, passed without any opposition and was signed into law by the governor. The program doesn’t mean students can enter any major at the campuses they pick. Some majors may require students to show higher high school grades or tougher courses if those programs have fewer openings than student demand. For Californians, the standard minimum GPA for entry is 2.5 in a series of college-preperatory courses.

    Students will also be free to apply to the six other over-enrolled Cal State campuses, though admission isn’t guaranteed. Those are Fullerton, Long Beach, Pomona, San Diego, San Jose and San Luis Obispo.

    What the Riverside pilot did

    High school counselors told CalMatters that the Riverside County pilot encouraged students who never considered attending a university to follow through with the automatic admissions process. Counselors also reached out to some students who were a class or two short of meeting the requirements for Cal State admission to take those, encouraging more students to apply to college who otherwise wouldn’t have. Younger students who were off the college-course taking track might be emboldened to enroll in those tougher high school courses knowing automatic admission is in the cards, the counselors said.

    Silvia Morales, a senior at Heritage High School, a public Riverside County high school, got an automatic admissions letter last fall. “I was pretty set on going to community college and then transferring, because I felt like I wasn’t ready for the four-year commitment to a college,” she said. She eventually submitted her forms, encouraged by her high school counselor.

    Following the Riverside pilot, Cal State campuses saw roughly 1,500 more applicants and 1,400 more admitted students in 2025 compared to 2024, though just 136 more students enrolled.

    The data for Riverside County reviewed by CalMatters suggests that more applicants and admitted students through an automatic admissions policy doesn’t translate into more enrolled students. Colleges closely follow their "yield rates" — the percentage of admitted students who ultimately enroll. In 2024, the Cal State yield rate for Riverside County was about a third. But in 2025, it declined by a few percentage points, meaning a lower share of admitted students selected any Cal State campus.

    This suggests that the system will have to work harder to convert admitted students into ones who actually enroll, said Iwunze Ugo, a research fellow at the Public Policy Institute of California, particularly with students who would not have applied were it not for the automatic admissions program.

    Automatic admissions doesn’t mean automatic enrollment

    While admission to a college overcomes a major hurdle to eventually enrolling, there are numerous steps necessary before students sit down for their first college course. Accepted students must submit additional grades, put down a deposit, complete registration forms and actually show up for the fall term. Students who were less engaged in the college-going culture are more likely to “melt” during the process between acceptance and enrollment, some studies show, though researchers say this can be reversed with additional outreach to students at risk of not enrolling.

    And even with an automatic admissions program, students must still register online and complete the application, which many students under the Riverside pilot didn’t do. Cal State sent out more than 17,000 automatic admissions notices to students, and just under 12,000 formally applied to at least one Cal State campus. Those who didn’t apply may have chosen another option, such as the often more selective University of California, private campuses, community colleges, or no college at all.

    “I think that'll be incumbent on the CSU to pick up some of that slack and encourage students admitted through this path to go through the rest of the process and ultimately end up at a CSU campus,” Ugo said.

    Cal State officials also recognize this. “Students who apply independently tend to have stronger self-directed interest, and therefore stronger intent to enroll,” said April Grommo, a senior Cal State official who oversees enrollment management. More direct engagement with students admitted through this program will be necessary, she said.

    Some campuses with a recent history of declining enrollment got a tiny pick-up from the pilot. San Francisco State saw 311 more applications from Riverside County in 2025 than in 2024. That translated to 11 more enrolled students, a review of Cal State data shows.

    A statewide program may steer more students to attend campuses with enrollment woes, even if the “yield rate” declines. That’s because if the rate of new students enrolling doesn’t rise as quickly as the number of students admitted, the yield rate drops.

    Under the expanded statewide program, Grommo said the system anticipates “enrollment growth as well, but not necessarily at the same rate as applications and admits,” she added.

    And as the economy shows signs of decay, the prospect of a college degree may compel more high schoolers on the fence to attend Cal State; System data show students from there earn a typical salary of $71,000 five years after graduating with a bachelor’s degree. Postsecondary enrollment tends to rise as the number of available jobs decreases, a social science phenomenon in which employers are more selective about who they hire, compelling many job-seekers to hit the books to show they’re more trained.

    Of course, souring economies often result in less public funding for colleges as state budgets are beleaguered, which may lead to fewer professors and staff for a growing cadre of students. “But I think generally, having more students is not a problem,” Ugo said.

    This article was originally published on CalMatters and was republished under the Creative Commons Attribution-NonCommercial-NoDerivatives license.

  • States sue to block youth transgender policy

    Topline:

    California joined a coalition of 19 states and the District of Columbia on Tuesday sued the U.S. Department of Health and Human Services, its secretary, Robert F. Kennedy Jr., and its inspector general over a declaration that could complicate access to gender-affirming care for young people.

    The backstory: The declaration issued last Thursday called treatments like puberty blockers, hormone therapy and surgeries unsafe and ineffective for children and adolescents experiencing gender dysphoria, or the distress when someone's gender expression doesn't match their sex assigned at birth. It also warned doctors that they could be excluded from federal health programs like Medicare and Medicaid if they provide those types of care.

    About the lawsuit: Tuesday's lawsuit, filed in U.S. District Court in Eugene, Oregon, alleges that the declaration is inaccurate and unlawful and asks the court to block its enforcement. It's the latest in a series of clashes between an administration that's cracking down on transgender health care for children, arguing it can be harmful to them, and advocates who say the care is medically necessary and shouldn't be inhibited.

    NEW YORK — A coalition of 19 states and the District of Columbia on Tuesday sued the U.S. Department of Health and Human Services, its secretary, Robert F. Kennedy Jr., and its inspector general over a declaration that could complicate access to gender-affirming care for young people.

    The declaration issued last Thursday called treatments like puberty blockers, hormone therapy and surgeries unsafe and ineffective for children and adolescents experiencing gender dysphoria, or the distress when someone's gender expression doesn't match their sex assigned at birth. It also warned doctors that they could be excluded from federal health programs like Medicare and Medicaid if they provide those types of care.

    The declaration came as HHS also announced proposed rules meant to further curtail gender-affirming care for young people, although the lawsuit doesn't address those as they are not final.

    Tuesday's lawsuit, filed in U.S. District Court in Eugene, Oregon, alleges that the declaration is inaccurate and unlawful and asks the court to block its enforcement. It's the latest in a series of clashes between an administration that's cracking down on transgender health care for children, arguing it can be harmful to them, and advocates who say the care is medically necessary and shouldn't be inhibited.

    "Secretary Kennedy cannot unilaterally change medical standards by posting a document online, and no one should lose access to medically necessary health care because their federal government tried to interfere in decisions that belong in doctors' offices," New York Attorney General Letitia James, who led the lawsuit, said in a statement Tuesday.

    The lawsuit alleges that HHS's declaration seeks to coerce providers to stop providing gender-affirming care and circumvent legal requirements for policy changes. It says federal law requires the public to be given notice and an opportunity to comment before substantively changing health policy — neither of which, the suit says, was done before the declaration was issued.

    A spokesperson for HHS declined to comment.


    HHS's declaration based its conclusions on a peer-reviewed report that the department conducted earlier this year that urged greater reliance on behavioral therapy rather than broad gender-affirming care for youths with gender dysphoria.

    The report questioned standards for the treatment of transgender youth issued by the World Professional Association for Transgender Health and raised concerns that adolescents may be too young to give consent to life-changing treatments that could result in future infertility.

    Major medical groups and those who treat transgender young people have sharply criticized the report as inaccurate, and most major U.S. medical organizations, including the American Medical Association, continue to oppose restrictions on transgender care and services for young people.

    The declaration was announced as part of a multifaceted effort to limit gender-affirming health care for children and teenagers — and built on other Trump administration efforts to target the rights of transgender people nationwide.

    HHS on Thursday also unveiled two proposed federal rules — one to cut off federal Medicaid and Medicare funding from hospitals that provide gender-affirming care to children, and another to prohibit federal Medicaid dollars from being used for such procedures.

    The proposals are not yet final or legally binding and must go through a lengthy rulemaking process and public comment before becoming permanent. But they will nonetheless likely further discourage health care providers from offering gender-affirming care to children.

    Several major medical providers already have pulled back on gender-affirming care for young patients since Trump returned to office — even in states where the care is legal and protected by state law.

    Medicaid programs in slightly less than half of states currently cover gender-affirming care. At least 27 states have adopted laws restricting or banning the care. The Supreme Court's recent decision upholding Tennessee's ban means most other state laws are likely to remain in place.

    Joining James in Tuesday's lawsuit were Democratic attorneys general from California, Colorado, Connecticut, Delaware, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Jersey, New Mexico, Oregon, Rhode Island, Vermont, Wisconsin, Washington and the District of Columbia. Pennsylvania's Democratic governor also joined.
    Copyright 2025 NPR

  • Expert explains threats of atmospheric river
    A group of people work with shovels to dig out a mud slide. In the distance there is trailer pushing mud
    People clear mud from a driveway along Pasadena Glen Road near the Eaton Wash after heavy rainfall triggered multiple mudslides in the Eaton Fire burn scar area in Pasadena on Feb. 14, 2025.

    Topline:

    Meteorologists are discussing this week's storm as a “one in every five years type of storm,” said Lisa Phillips with the National Weather Service. “There's going to be problems everywhere. We have a lot of canyon roads and mountain roads, and things will fall down.” Phillips explains debris flows after wildfires and why Southern California is particularly vulnerable to them.

    Landslides, mudslides and debris flows: Landslide is an umbrella term that captures all kinds of mass movements, from rock falls to debris flows — these floods on steroids — to big, slow movers. According to Phillips, meteorologists are most concerned about debris flows in recent burn areas. "It's also called a mudslide. But geologists don't like to use the word mudslide as much because it sounds like there's some mud on your driveway — not a big issue, not something that could kill you. And these things, if you're in the wrong spot at the wrong time, they can cause serious damage," Phillips said.

    SoCal particularly at risk: Phillips said Southern California is "kind of the world capital for these kinds of events." A combination of very steep topography that burns fairly frequently along with many people living close to mountain fronts increases risk for the region. In burn areas, Phillips says "it takes much less rainfall to cause a problem than it would in unburned conditions."

    A dangerous atmospheric river is poised to deliver “excessive rainfall” across Southern California, raising fears that the rain could unleash a threat that has been lingering in the burn scars of wildfires that ravaged Los Angeles communities in recent years.

    Called debris flows, these fast-moving slurries of floodwater and sediment can hurtle down slopes carrying cars, trees and even boulders with them.

    They’re like “a flood on steroids,” said Jason Kean, a research hydrologist with the U.S. Geological Survey’s landslide hazards program. “It’s really hard to stop these things. The best thing to do is get out of the way.”

    Northern California is already reeling from the atmospheric river that unleashed catastrophic flash flooding in Redding over the weekend, killing a 74-year-old man who became trapped in his pickup truck on a flooded roadway.

    Now, another storm is expected to reach coastal Northern California this evening, with strong winds and especially heavy rainfall pushing into Southern California.

    Forecasters warn that the rain “will cause life-threatening flash flooding, along with landslides, rockfalls, and/or mudslides,” particularly for areas along Southern California’s Transverse Ranges, including the San Bernardino, San Gabriel, and Sierra Madre mountains. “Urban flooding in the greater Los Angeles metro area is likely.”

    Burn scars — slicked by fire and stripped of plants — are especially dangerous during heavy rains. A storm after the Thomas Fire in 2018 spurred debris flows in Montecito that killed 23 people. And in February, a debris flow in the Palisades Fire burn zone swept a Los Angeles Fire Department member and his SUV into the Pacific Ocean.

    The Los Angeles County Department of Public Works warns that there’s a risk of moderate debris and mudflows capable of blocking roadways and endangering some structures in the burn scars of more than a dozen fires — including January’s Eaton, Hurst and Palisades fires.

    The county has issued evacuation warnings in and around recent burn scars, and urged those who may take longer to evacuate to consider leaving now. Officials also announced some targeted evacuation orders for specific properties “at higher risk for mud and debris flows impacts.”

    “Recent burn areas, including those impacted by the January wildfires, remain highly susceptible to mud and debris flows,” county officials warned Monday.

    Gov. Gavin Newsom announced Monday that more than 225 personnel and resources including 45 fire engines, 10 swiftwater rescue teams, helicopters and more have been pre-deployed to a dozen northern and southern California counties.

    Meteorologists are discussing it as a “one in every five years type of storm,” said Lisa Phillips with the National Weather Service. “There's going to be problems everywhere. We have a lot of canyon roads and mountain roads, and things will fall down.”

    Phillips said she expects to see mudslides, landslides, sinkholes — even after the rains have ended, and urged people to stay off the roads if they can.

    “There's going to be issues outside of the burn scars too, and flooding,” Phillips said. “We want everyone to stay at home, stay safe and don't get yourself into any trouble unnecessarily.”

    We spoke with the U.S. Geological Survey’s Kean, an expert on debris flows after wildfires, last month about what to expect when storms strike burn scars. This conversation has been edited and condensed.

    As this storm really takes hold in L.A. and Southern California, I'm hearing a lot of concern about it hitting areas that burned this past year, including in the Eaton and Palisades fires. Why is this such a big concern? What could happen?

    Last January those fires removed much of the vegetation on really steep slopes, and that made those slopes really vulnerable to erosion during intense rainfall. That protective blanket of vegetation is gone, and heavy rain can rapidly make a flash flood. And that flood, in some cases, can pick up material and turn into what we call a debris flow — which is like a flood on steroids.

    Damage along Tanoble Drive near Mendocino Street is visible after heavy rainfall triggered multiple mudslides in the Eaton Fire burn scar area in Altadena on Feb. 14, 2025. Photo by Joel Angel Juarez for CalMatters These burn areas are still vulnerable, even though it's now many months after the fire and there have been flows already. There's still plenty of material that could be mobilized. So the threat’s still there. And so we know they're bad actors, and we’re concerned they could be bad actors again.

    I’m hearing a lot of different terms: mudslide, debris flows, landslide. What are the differences, and which ones are the burn scars at risk for? 

    Landslide is an umbrella term that captures all kinds of mass movements, from rock falls to debris flows — these floods on steroids — to big, slow movers. The type of flow that we're most concerned about in a recent burn area is a debris flow. It's also called a mudslide. But geologists don't like to use the word mudslide as much because it sounds like there's some mud on your driveway — not a big issue, not something that could kill you. And these things, if you're in the wrong spot at the wrong time, they can cause serious damage.

    You called it a flood on steroids. What happens in a debris flow? 

    Flash floods are bad, and they can cause lots of problems, too. They can get even worse if they pick up enough sediment to turn into the consistency of wet concrete. But it's worse than just concrete, because it can contain boulders the size of cars. And, very close to the mountain front, it can move very quickly — faster than you can run. And when it gets all bulked up with debris, the rocks, the gravel, the mud, trees, the flow can be a lot bigger. It just turns into a different animal.

    Now, debris flows pack a bigger punch than floods, but thankfully, they don't have as long of reach. So usually, the debris flows are confined really close to the mountain fronts. That's where they put those debris basins to catch them. But if there isn't one protection like that, then they can travel downslope and impact neighborhoods, and then flooding can extend even further down.

    Is there something about Southern California that makes it higher risk?

    Southern California's kind of the world capital for these kinds of events. It's got this combination of very steep topography, like the San Gabriel Mountains that just shoot right up, Santa Monica Mountains, Santa Ynez — very steep topography. It burns fairly frequently. And then there are a lot of people living very close to the mountain front, so that's what puts the risk up.

    The thing about a burn area is it takes much less rainfall to cause a problem than it would in unburned conditions. So we've now made the slopes really vulnerable. They're extra steep. There's a lot of people there. That's why the risk is so high.

    We've seen debris flows in Northern California burn areas as well. It's not just a Southern California problem, and it's not just a California problem.

    Is there anything that could have been done to reduce this risk? Anything that should be done now? 

    Not long after the fires, in particular the Palisades Fire, (there were) a number of fairly widespread debris flows that disrupted the roads. There were also, in the Eaton fire, floods and debris flows there. Thankfully there's a dense network of LA County debris basins, which are designed to catch the material before it enters neighborhoods, and those largely saved the day.

    Planners have planned ahead and put in these debris basins — these big, giant holes in the ground — designed to catch the material. That's the best defense against these. They're not everywhere, but there is a good network of protection. Other than that, it's really hard to stop these things.

    What should people who live near the recent burn scars know? What should they do now, as the rain starts? 

    The best thing you could do is, if you're really close to a drainage in one of these burn areas, is to get out of the way. You're going to get a heads up from the National Weather Service, who's closely monitoring the rainstorms. They know how much rain it's going to take to cause a problem, and they'll get out warnings, and local authorities will reach out to get people out of the way. So there's a lot of eyes on the situation. And so at this point, the best thing to do is listen to the weather service, listen to local authorities.

    If they ask you to get out of the way, take their advice. These things can happen really fast if there is an intense burst of rain, a flash flood, where debris flow can start within minutes.

    So there is no escaping a debris flow once it starts? 

    It's pretty difficult. If you have a two-story home and you happen to be there at the wrong time, get up to that second floor for sure. Fight like heck if you get trapped in one. But best to be out of the way.

    This article was originally published on CalMatters and was republished under the Creative Commons Attribution-NonCommercial-NoDerivatives license.