The most powerful stage of Southern California’s most powerful winter river storm arrived Thursday, and is expected to be at a high risk of major flooding and landslides on the road.
The National Weather Service in Oxnard is expected to peak Thursday slightly earlier than previously forecast and leave.
The Weather Service said there is a high risk of flooding, debris flow and wind damage. “We will change our travel plans and avoid roads on Thursday. Conditions can escalate quickly with little warning.” Weather services have suggested parking and charging electronics away from the trees.
Here are some things you need to know about timing, evacuation orders and warnings, the areas of greatest risk, and more.
timing
That’s when certain counties are expected to bear the brunt of a storm. Timing may vary a few hours ago or after.
San Luis Obispo County: 8am to 4pm
Santa Barbara County: 10am to 6pm
Ventura County: 12pm to 8pm
Los Angeles County: 2pm to 10pm
Orange County and the Inland Empire: 5pm to 10pm
San Diego County: 8pm to 2am
Areas burned in fires in Eton, Palisade, Franklin and Bridges have high peak rainfall rates and risk of landslides.
(National Weather Service)
Evacuation
Evacuation warnings have been issued in many burnt areas. Evacuation maps can be found here and here.
Los Angeles County:
Pacific Pallisard: The area is limited to residents only from 7am on Thursday to 2pm on Friday. Contractors with passes will not be allowed to enter. Evacuation warnings include Getty Villa area, parts of the Highlands near the burnt area, north of the Bien Benneda Avenue area, north of Temescal Canyon Road, north of Marinette Road and Oracle Place, and Villa Woods Drive and Villas Area around the road at Rogers State Park, including Grove Drive.
Brentwood: A warning has been issued for Mandeville Canyon Road, north of Tanners Road.
Malibu: Evacuation warnings were in place in the near eastern half of Malibu, from the eastern edge of the city to the intersection of the Pacific Coast Expressway and Malibu Road near Bayshore Drive. The warning area includes the Malibu Civic Centre and Pepperdine University. Pepperdine is moving to remote classes on Thursday. The university said the consulting engineers had “low risk of challenges due to the flow of wreckage” on the Malibu campus, and that Pepperdyne’s evacuation order was “almost unlikely.” Malibu public schools will be closed on Thursday.
Sunset Mesa: An unincorporated area sandwiched between Malibu and the Pacific Ocean Pallisad just north of Malibu and the Pacific Coast Highway has been receiving evacuation warnings.
Hollywood and Hollywood Hills West: Warnings are also in effect around the Sunset Fireburn Zone around Ranyon Canyon, including the northernmost blocks of North Vista Street and North Carson Avenue.
Silmer: Evacuation warnings were in effect at some homes on the western edge of Oak Ridge Mobile Home Park.
Calabasas: Warnings were in effect in the Malibu Canyon and Alizia Canyon districts.
Altadena: A warning has been issued regarding the northern region of Altadena, adjacent to the San Gabriel Mountains.
Kinneloa Mesa: The neighborhood is under an evacuation warning.
Pasadena: Northeastern neighborhoods have received warnings including several blocks north of Hastings Ranch Road and Park Vista Drive.
Sierra Madre: The northern part of Sierra Madre has received evacuation warnings.
San Gabriel Mountains: The area between East Fork Road and Shoemaker Canyon Road along the San Gabriel River has been warned.
Orange County
Orange County officials issued voluntary evacuation warnings in the Trabuco Valley, Hot Springs Canyon, Bell Canyon, Long Canyon and Modeska Canyon areas due to the risk of debris flowing near airport burn scars. The evacuation warning will take effect from 8am on Thursday.
San Bernardino County
Evacuation warnings were issued not only to the northern and eastern areas of Highland, but also to unincorporated communities in Mount Valdi Village and Lightwood.
Santa Barbara County
The county has issued evacuation orders for some areas of the fire zone and surrounding areas in the mountainous lakes north of Los Olivos. Evacuation warnings were effective in larger areas.
Burn scars with the best risk
Areas burned by wildfires recently are at risk of seeing landslides such as debris flows.
That type of landslide can travel as fast as 35 mph, destroying homes and threatening lives.
All areas that have been burned recently are of concern, but these three are the most concerned.
(National Weather Service)
•Palisade and Malibu burning scars (23,707 acres) and Franklin (4,037 acres).
• Eaton (14,021 acres) burn scars at Altadena.
•The bridge (56,030 acres) burns scars at San Gabriel Mountain, west and southwest of Lightwood.
The village of Mount Bardi, adjacent to the bridge’s burns, is located under a heavy rain-sensitive area and was able to see the large land movement in the event of heavy rain, says Alex Taldi, a meteorologist with the San Diego Meteorological Bureau. I said that.
Massive burns in San Diego and Orange Counties and the Inland Empire.
(National Weather Service)
Other burn scars that predictors are closely watching are:
• Line (43,978 acres) in San Bernardino County, burn scars from Highlands to the Big Bear.
•The lake (38,664 acres) burns scars in the mountains of Santa Barbara County, north of Los Olivos.
• Burn scars in the airport (23,526 acres) Santa Ana Mountains.
•The mountain (19,904 acres) burns scars south of Santa Paula and north of Camarillo.
•Fughes (10,425 acres) burn scars around the lake.
•Kenneth (1,052 acres) burns wounds west of Woodland Hills and north of Calabasas.
• Burn scars in the Hurst (799 acres) Schirmer area.
• Sunset (43 acres) burn scars around Hollywood Hills West.
• The post (15,563 acres) burns scars south of Gorman near the Grapevine section of Interstate 5.
•Apache (1,538 acres) burns scars in rural Ventura County, northwest.
• Lydia (395 acres) burns scars on the north slopes of the San Gabriel Mountains near Acton.
The main concern for airport burns is the possibility of a stream of debris into Trabuco Canyon, Tardy said.
(National Weather Service)
Areas where the heaviest rain is visible
Rain reaches more than half an inch per hour, which can cause debris flow in recently burning areas.
The areas for peak storm rainfall rates are as follows: Please note that rates can vary by more than a quarter inch per hour than those listed below.
But they “provides a pretty good idea as far as what you can expect at this peak storm,” said Ryan Kittel, a meteorologist with the Oxnard Meteorological Bureau.
Lake Scars: 0.76 inches of rain per hour.
Eaton Burn Scar: 0.72 inches per hour.
Bridgeburnsker: 0.65 inches per hour.
Palisades and Franklin Burn Scars: 0.6 inches per hour.
Hurst Burning Scar: 0.6 inches per hour.
Mountain Burn Scars: 1 inch per 0.54 inch.
These fees are not expected throughout the day. During most of the county’s peak storms, rain is expected to fall at a more modest rate of quarter-inch to 0.5 inches per hour, Kittel said.
But it’s a short burst of heavy rain that can cause the most trouble. And there are some forecasts that show a rainfall rate of more than an inch per hour.
“We really could see them everywhere,” Kittel said. “It’s not necessarily widespread. It depends on where they are heavy. [storm] Cell…realized. ”
Factors that may contribute to debris flow
A short burst of heavy rain can cause debris flow, a type of potentially dangerous shallow landslide.
The stream of debris occurs when water quickly flows downhill, picking up not only mud but rocks, branches, and sometimes huge rocks and cars.
The main debris flow on February 6, 2010 caused more than 40 homes to be flooded with mud, rock and dented cars at the northernmost tip of La Canarda Flintridge. In the above, the woman runs away from the house during the event.
(Raul Roa/Los Angeles Times)
They can damage or destroy a home, or threaten their lives. A few months after the 160,557 acre station fire in 2009, it was the largest wildfire in LA County history, and in a massive stream of wreckage on February 6, 2010, the mud in the northernmost neighbourhood of La Canarda Flintridge. , rocks and dented cars have flooded.
Animated infographics show that shard flow works
The perpetrator is a violent band of rain cells formed on a 10-ton boulder blocking the burned mountains and the fragment basin of Mallary Canyon, designed to be poured from the slopes and caught mud while trapping Ashen mud. It was being done. Authorities later worked to build $1.5 million drains to divert stormwater from the basin and increase the storage capacity of the area’s fishing zone.
The vehicle was thrown like mud and debris, like mud and debris coming out of the Marary Canyon Debris Basin and the ocean’s boulevard on February 6, 2010.
(Raul Roa/Los Angeles Times)
Other potential impacts from this storm
Other expected impacts from this storm are:
• Damage the wind. Gusts can reach 40-65 mph on mountains, deserts and central coasts, and 20-40 mph elsewhere.
•Downed trees and power outages.
• Delays at the airport.
• Dangerous seas and ports.
• Possibility of rapid water rescue in the river.
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