A 'Tough Day' For LA As Atmospheric River Batters Region. There's More Rain Ahead

Officials urged people in L.A. County to stay vigilant as the second of two atmospheric rivers continues to soak the region, causing floods, downed trees, debris flows and other hazards ahead of what is expected to be another full day of rain on Tuesday.

So far, Los Angeles County has been the hardest hit since the storm parked itself over the region, causing debris flows and widespread flooding.

The storm is expected to head southeast on Tuesday over Riverside and San Diego counties. L.A., meanwhile, will keep getting drenched. An additional 3 to 6 inches is possible before things start to dry out Wednesday.

Downtown L.A. saw 4.1 inches of rain, breaking the previous daily rainfall record of 2.55 inches set in 1927. Sunday was the 10th wettest day in L.A. history.

However, those rainfall totals are mild compared to what we've seen at other weather stations. More than 10 inches of precipitation has fallen on Topanga and Woodland Hills in the western San Fernando Valley.

"Stay safe and off the roads. Only leave your house if it is absolutely necessary," L.A. Mayor Karen Bass said at a news conference Monday.

As of noon Monday, the L.A. Fire Department had rescued trapped motorists, responded to 130 flooding incidents, and 49 reports involving mud and debris flows, officials said.

At around 9 p.m. Sunday, 16 residents were evacuated from nine Studio City homes after a mudslide damaged two structures on Lockridge road. And L.A. firefighters evacuated people from at least three homes affected by debris flows on West Boris Drive in Tarzana. A landslide on Beverly Crest damaged at least six homes, forcing the evacuation of 15 people.

More than 7,200 LADWP customers were without power as of midday.

Flood watches and warnings are in place from Santa Barbara to San Diego counties through Tuesday as the heavy rain is expected to continue.

These long, sustained periods of rain are characteristic of El Niño storms. Warmer than normal waters off the coast — often associated with the climate phenomenon — are juicing our recent storms by sending more heat and water into the atmosphere.

Keep scrolling to see more information on rainfalls, landslides and other critically important information about the storm.

A man walks his dog on the edge of the Los Angeles River, carrying stormwater downstream Sunday, Feb. 4, 2024.

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Damian Dovarganes

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AP

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Areas of high concern

• The southbound 405 Freeway at Moraga Drive, where a rock slide is blocking an outside lane.
• The 5 Freeway's southbound connector to the 110 Freeway is blocked by a rock slide.
• San Bernardino County officials are concerned about the potential amounts of snow falling in the mountain communities from Arrowhead to Big Bear. You'll recall that last year, massive amounts of snow paralyzed the communities, stranding people in their homes, destroying a local grocery store and making it difficult for people to get food and services. They are expecting 2 to 4 feet of snow above 7,000 feet and up to 10 inches in the 5,000 to 6,000 foot level.
• The Lost Hills Sheriff's Station says all roads going to and from Malibu are having rock and mud slides. Malibu Canyon Road is closed between Malibu Crest and Mulholland Highway.
• Sheriff's officials advise against driving on Kanan Dume Road, Topanga Canyon and other area roads.
• Caltrans has closed State Route 23, aka Westlake Boulevard south of East Potrero Road due to flooding.
• Pacific Coast Highway between Warner and Seaport in Huntington Beach is closed due to flooding.

Rainfall totals

As of 4:30 p.m. Monday:

• Topanga: 11:34 inches
• Woodland Hills: 10.97 inches
• Bel Air: 11.64 inches
• Downtown L.A.: 7.01 inches
• Santa Monica: 6.62 inches
• Pasadena: 6.07 inches
• Ventura: 3.63 inches
• Santa Barbara: 3.88 inches
• Mt. Baldy: 7.68 inches

These are particularly impressive totals, given that our average yearly rainfall in the L.A. area tends to land somewhere between 12 to 15 inches.

Don't be surprised if we see long standing rainfall records fall.

Reports of landslides

It's not uncommon for rocks and mud to flow off steep hillsides and onto roads during heavy rains, and debris flows were reported across the region overnight. Additional incidents are likely as the day progresses.

• Studio City: Two homes damaged by mudflow, with a total of 16 residents evacuated from nine homes. Heavy equipment has been brought out to help clear the road.
• Tarzana: Three homes damaged by a mudflow and two people evacuated from a home.
• Beverly Crest: Seven homes have been damaged by debris flow and 15 people were evacuated.
• Topanga Canyon: A mudflow has closed a portion of the canyon.
• Southbound 5 Freeway to southbound 110 Freeway, and Riverside Drive on-ramp: Closed due to mudflow.
• 405 Freeway just before Sunset: Small debris flow has closed the offramp.
• Agoura Hills: Small mudslides at Cornell road and Eagleton street.
• Malibu: 10-foot boulder reported on northbound Malibu Canyon Road just north of Pacific Coast Highway.
  

The LA River

Social media has been inundated with videos of the Los Angeles River gushing with water as historic rains pummel Southern California.

But Jon Sweeten, a reservoir regulation engineer with the U.S. Army Corps of Engineers, Los Angeles District, said videos of the Los Angeles River seemingly on the verge of overflowing shouldn't necessarily be cause for alarm.

“People see a lot of water in a channel that they see that's normally dry and they go, ‘Oh my goodness, there's a lot of water,’” he said. “That's just the channel operating in the way it was designed.”

The system, Sweeten added, “is designed to hold some of the water behind the dams and release it into concrete line channels that will convey the flow very effectively to the ocean.”

Since the 51 miles of river pass through different cities, at the time it was built, they were responsible for building bridges within their respective boundaries. Locals at the time asked for a narrow river so that it would be cheaper to build the bridges while also preserving more developable land.

“In order to make the system work well, they designed it so that it flowed very fast so — the system flows much faster than a natural stream would flow,” Sweeten said. “Which is why it's dangerous for people to stand on the concrete in the L.A. River, because water up to your ankle is capable of knocking you off your feet.”

Up in the mountains

So far, snow levels have been quite high, mostly above 7,000 feet. They'll fall to about 5,500 feet by Monday night, bringing snow to popular mountain areas.

Big Bear could see 6 to 8 inches, while Wrightwood could see 12 to 18 inches.

Higher mountain peaks like San Jacinto (10,834 feet) could get around 1 to 3 feet of snow, while Mt. San Antonio (10,064 feet) could get 4 to 6 feet.

The eastern San Gabriel mountains and the San Bernardino County mountains are under a winter storm warning until 10 p.m. Tuesday for areas above 6,000 feet.

Travel is expected to be difficult, if not impossible. Higher mountains could see winds up to 70 mph, which can damage trees and knock them onto roadways. If you must head in or around these areas, pack emergency supplies in your car just in case.

The Mount Wilson observatory closed Saturday until further notice because of the weather. Mountain High Resort was also closed Monday, but is expected to reopen on Tuesday.

The Angeles National Forest is urging people to stay away from the area at least for the next few days. Very hazardous conditions are expected, including heavy rain, fast-moving landslides, snow, and flooding.

Evacuations

Los Angeles County

• An evacuation order is in effect for homes and businesses along La Tuna Canyon Road near the burn scars from the Land Fire in 2022. More info here.
• Evacuation order was issued Saturday night through 6 p.m. Tuesday, Feb. 6, for the area of Topanga Canyon along Santa Maria Road north of Topanga Canyon Boulevard in the Owen Fire burn scar. Officials said: "Immediate threat to life. This is a lawful order to leave now. The area is lawfully closed to public access."
• Evacuation order for the Agua Fire Burn Area in Soledad Canyon, east of Acton.
• Evacuation warnings are in effect Sunday morning through 6 p.m. on Tuesday, Feb. 6, for areas near the Bobcat Fire (north end) and Lake Fire burn scars.
• An evacuation warning is in effect Sunday afternoon through 10 a.m. on Tuesday, Feb. 6 for the area in the Fish Fire burn scar in the city of Duarte.
• Evacuation warnings are also in effect Monday afternoon through 11:59 p.m. on Tuesday, Feb. 6 for areas of Culver City’s Upper Crest area due to potential mud or debris flows. The city is asking people who live above, below, or adjacent to a hillside in or below the Upper Crest neighborhood to take extra precautions.
• More info here.

Orange County

• A voluntary evacuation warning was issued for Silverado Canyon, Williams Canyon and Trabuco Canyons due to heavy rains.
• Canyon residents were strongly encouraged to prepare and voluntarily evacuate on Sunday, especially those with disabilities, access and/or functional needs, and canyon residents with large animals.
• More info here

Ventura County

• Evacuation orders were issued for Matilija Canyon, North Folk, Camino Cielo in Ojai.
• Evacuation warnings have been issued for a number of communities in Ojai and Camarillo.
• More info here.

Santa Barbara County

• Evacuation orders are in effect for:
  
  • Properties along waterways associated with the Thomas, Cave and Alisal burn areas.
  • Properties in the vicinity of Sycamore Creek, from Stanwood Dr. down to parts of Ninos Dr., in the city of Santa Barbara.
  • All state campgrounds including Gaviota, Refugio, El Capitan and Carpinteria
  • More info here.

• San Bernardino County and Riverside County
  
  • From the Yucaipa Police Department: Evacuation warning due to potential mud and debris flow for El Dorado and Apple fire burn scars.

Schools

• Los Angeles Unified School District announced that all schools will be open on Monday with the exception of Topanga Elementary Charter and Vinedale College Preparatory Academy. Topanga students may report to Woodland Hills academy at 8001 Ledge Avenue in Sun Valley, while Vinedale students may report to Glenwood Elementary School.
• Santa Monica and Malibu Unified schools are expected to open Tuesday.
• Long Beach Unified released this statement on Sunday afternoon:
  "While there are currently no plans to close schools, in the event of any impacts or changes to scheduled plans, families from the affected schools will receive direct communication via text and email. Additionally, updates will be promptly posted on the school websites and social media platforms."
• Santa Barbara Unified and Santa Maria Joint Union High School District have both preemptively cancelled classes and activities for Monday.

Universities

• UCLA- Normal operations. Classes will occur as usual
• USC- Normal operations. Classes will occur as usual
• Cal State Fullerton is pivoting to remote classes on Monday. Staff are encouraged to work remotely. The faculty will have access to offices and facilities as the campus will remain open.
• UC Santa Barbara has instructed faculty to move to remote instruction or reschedule classes. Any staff impacted by weather (including if a child’s school closes) should be allowed to work remotely or “request time off”
• Cal State Long Beach said it expects normal operations and classes to resume on Tuesday.
• Cal Poly Pomona is moving to remote classes and remote work for non-essential employees on Monday. The university says "The campus will remain open and minimally staffed, including University Housing, the Library, Centerpointe and student health services. We will provide an update via email and on the safety and emergency web page by the end of business on Monday regarding operating plans for Tuesday, February 6, 2024."
• Cal State Northridge remains open, but on-campus in-person classes are cancelled. Course instructors will determine whether courses will shift to online instruction or alternative assignments.

The forecast for coming days, as of Sunday morning.

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Courtesy National Weather Service

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Here's what rainfall totals are forecast to be in coming days:

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Courtesy NWS San Diego

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High winds are also expected to be an issue:

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Courtesy NWS Los Angeles

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Emergency proclamations and preparation

The powerful storm moved L.A. County Supervisor Lindsey Horvath to sign an emergency proclamation Sunday night for the region. She said the move will align the county with Gov. Gavin Newsom’s emergency order and help the county act quickly to deploy resources.

“We had to proclaim a local emergency today following the governor’s statewide emergency declaration. We wouldn’t do that if this was something to ignore,” Horvath said.

San Bernardino County also declared a state of emergency Sunday night in anticipation of extreme rain and snow expected through Wednesday.

“This declaration puts the state and federal government on notice that our residents will need their help,” said San Bernadino County Supervisor Dawn Rowe.

L.A. Mayor Karen Bass said the city is prepared to weather the effects of a potentially catastrophic storm. Bass declared a local state of emergency on Monday.

“This has been a tough day for our city,” Bass said Monday evening.

A man and his dog were rescued from the Pacoima Wash near Foothill Boulevard via helicopter after he jumped into the water after his dog. LAFD Fire Chief Kristen Crowley said both the man and the dog are safe now.

Bass said more than 100 unhoused people had to be evacuated from a tiny home complex. She added that they’re being moved into a nearby shelter that wasn’t being used, but now will be “instantly” filled.

Bass also answered a call from President Joe Biden towards the end of Monday’s news conference and held the phone up to the microphone so he could speak to the people of Los Angeles.

“We’ll get any help on the way as soon as you guys request it, so just let me know,” Biden said.

Mandatory evacuations have been issued for certain areas of L.A. and Santa Barbara counties.

Why LAUSD plans to be open Monday

L.A. Unified Superintendent Alberto Carvalho said based on Monday's forecast, schools will remain open tomorrow morning, unless weather conditions change. District officials said they issue an update at 6 a.m. Monday.

Carvalho said in a news conference Sunday that the schools will remain open because "they are the places where many of our kids receive their nutrition."

However, Vinedale Elementary School, which is in an area in Sun Valley that is under mandatory evacuation, will be shut down. Students will report to Glenwood Elementary School about a mile away.

Heavy rains are expected to continue through Monday morning, with some of the most intense downpours expected between 2 a.m. and 3 a.m.. The National Weather Service is warning of "life threatening flooding, damaging winds and heavy mountain snow," and has revised the expected rain totals to up to 8 inches across the greater L.A., and up to 14 inches in the mountains and foothills, through Tuesday.

"Los Angeles County now seems to be the area of most concern where the heaviest rain will last the longest," said Ryan Kittell at the National Weather Service.

Flooding and other dangers are expected for across the state. California officials warned that the Southern California coastline — including Los Angeles and San Diego metro areas — would likely see the most severe damage.

"These next storms are going to be impactful and dangerous, and most of the damaging impacts most likely to our coastal and southern regions," said Nancy Ward, director of the California Governor's Office of Emergency Services. "They're the most dangerous natural disasters that we have, killing more people from storm damages and flooding than wildfires every year."

More ahead

Residents in mountain, canyon and coastal areas should prepare for the risk of debris flows and flooding to remain at least through Tuesday.

Those in landslide prone areas like the Palos Verdes Peninsula should be on the lookout for indications of land movement, including the formation of new cracks, the fracturing of underground utilities, doors and windows falling out of plumb and sounds of creaks and groans coming from the ground.

Sandbags are available at all Los Angeles Fire Department locations. Sand is also available at select other locations, and updates on availability can be checked here.

Los Angeles County Fire Department locations also have sandbags and sand.

Sand and sandbags are available at these locations in Orange County.

Understanding National Weather Service warnings

Here’s an excerpt from our guide to understanding flood warnings, if any are issued:

• Flood advisories are how the NWS begins to raise the alarm. The goal is to give people enough time to take action.
• Flood watches are your indicators to get prepared to move.
• A flood warning is issued when a hazardous weather event is imminent or already happening. When one is issued for your area, you need to get to higher ground immediately.
• A flash flood warning is issued when a flash flood is coming or in progress. Flash floods are sudden and violent floods that can start within minutes.

Read more: Flash Flood Warnings? Watches? Here’s What You Need To Know

Tips for driving in the rain

Advice on driving in the rain:

• Check weather and road conditions all along your planned route
• Slow down
• Keep a wider-than-usual distance between your vehicle and the one in front
• Don't drive through standing water — as little as 12 inches of rushing water can carry away most cars, and two feet can carry away SUVs and trucks.
• Make sure tires are fully inflated
• Check windshield wiper blades and replace if necessary

Read more: What You Should Do If You End Up Driving In A Flooded Area

Downed tree, power line or flooded road?

Dial 911 if it's an emergency.

However, if you need to report a flooded road or a downed tree, you can call the following non-emergency numbers:

• L.A. City: Dial 311 for a flooded road or downed tree. Call (800) DIAL-DWP if you see a downed power line.
• L.A. County: (800) 675-HELP
• Ventura County: (805) 384-1500
• Orange County: (714) 955-0200 or visit here.

If you're in L.A. County and need sand bags you can find some at local fire houses.

Staying safe when the winds are high

• Watch for traffic signals that may be out. Approach those intersections as four-way stops.
• Make sure you have a battery-operated radio and flashlights. Check the batteries to make sure they are fresh. Use flashlights for lighting during a power outage; do not use candles because they may pose a significant fire hazard.
• If you’re in a vehicle with a fallen power line on it, stay in the vehicle and remain calm until help arrives. It is OK to use your cellphone to call 911. If you must leave the vehicle, remember to exit away from downed power lines and exit by jumping from the vehicle and landing with both feet together. You must not touch the vehicle and the ground at the same time. Then proceed away from the vehicle by shuffling and not picking up your feet until you are several yards away. 
• Water and electricity don’t mix. Water is an excellent conductor of electricity. Do not step in or enter any water that a downed power line may be touching.
• Do not use any equipment inside that is designed for outdoor heating or cooking. Such equipment can emit carbon monoxide and other toxic gases.
• If you use a generator, place it outdoors and plug individual appliances directly into it, using a heavy-duty extension cord. Connecting generators directly to household circuits creates “backfeed,” which is dangerous to repair crews.
• Leave the doors of your refrigerator and freezer closed to keep food as fresh as possible. Place blocks of ice inside to help keep food cold. Check food carefully for signs of spoilage. 
• Check on your neighbors to make sure everyone is safe.

Tips on staying warm

• State law requires residential units to have heating systems that can keep indoor temperatures at a minimum of 70 degrees. That means every dwelling unit and guest room offered for rent or lease should offer heating equipment, usually central air conditioning (A/C) or a wall heater. — Caitlin Hernández
• Use heat smartly to save money: Cranking things like the A/C and wall heaters can be expensive. If money is tight, be judicious about how and when you use your utilities. For example, only use heaters at night or only set the thermostat to around 70 degrees.
• Open and close those vents: If you have central A/C, look at where the vents are around your home. Are any open in places where you don’t stay long? Practice opening and closing those so warm air only goes where you need it (most vents should have a small toggle lever). Humidifiers can also help you warm things up — and it’s useful to add moisture into our dry air.
• Adjust your wall heaters: If you have a wall heater, you can change the output by adjusting the knob (usually at the bottom). Since wall heaters can only warm the areas where they’re placed, it’s essential to close doors to rooms you won’t be in so hot air doesn’t get wasted.
• Turn on your ceiling fan (really): If you have a ceiling fan, try turning it on. This sounds counterintuitive, but there’s science behind it. The direction a fan turns can push air in different directions, and since hot air floats up, you’ll want to move that around. Your fan should spin clockwise to create an updraft to circulate. Not all fans will have this option, though.
  

Sign up for emergency alerts

• L.A. City: Notify L.A.
• L.A. County: Ready L.A. County
• Ventura County: Ready Ventura County
• Orange County: AlertOC
• Riverside County: AlertRivCo

How we're reporting on this

George Kiriyama, a senior editor, is tracking the storm and adding updates along with Kevin Tidmarsh, a producer, and Fiona Ng, LAist's weekend editor. Other LAist staff members will be keeping a close eye on how the storm is affecting various parts of the region.

This is a developing story. We fact check everything and rely only on information from credible sources (think fire, police, government officials and reporters on the ground). Sometimes, however, we make mistakes and/or initial reports turn out to be wrong. In all cases, we strive to bring you the most accurate information in real time and will update this story as new information becomes available.

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