Storm Pounds LA County with rain, snow for hours – NBC Los Angeles

What to know

  • Constant rain overnight causes flooding and forces roadblocks in Southern California.
  • The slow speed of the storm means there are concerns about floods continuing into Thursday.
  • The Grapevine section of 5 Freeway north of Los Angeles was closed for hours due to snow and ice.

An early winter storm triggered hours of rain and snow in southern California, leading to floods and landslides in Malibu, evacuations in some fire-hardened gorges and the closure of a major highway in northern Los Angeles County.

The rain started over Ventura County around noon. 9 Wednesday. The slow speed of the system means that Los Angeles County did not see its heaviest rain until around later in the night.

And it just kept raining.

“This line of rain is over LA County and the moisture is flowing up from the south,” said NBC4 forecaster David Biggar. “So, it’s really moving nowhere. It’s just continuing the heavy rainfall across the region.”

The storm will stagnate in Los Angeles County for hours, bringing significant rainfall to the region all the way through Thursday morning and into the afternoon. With constant rain, debris can flow and sides are possible in burned areas.

The rain will subside late Thursday, decreasing to light showers overnight. Conditions dry out over the weekend.

Still raining overnight floods a SoCal campsite. Video broadcast Thursday, December 30, 2021 on NBC4.

A winter storm warning was issued Tuesday night for the mountains of San Bernardino County and Riverside County, which lasted until Thursday night. Snow levels are expected to be as low as 5,000 feet, with between 6 “and 1 ‘of snow falling.

Heavy snow will fall in the area’s mountains all the time. The snow will also be the longest part of the storm and will continue until Friday morning, even after the rain has stopped in the rest of the region.

This is what Highway 5 north of Los Angeles looked like after the Grapevine section of the road was closed. John Cádiz Klemack reports on Thursday, December 30, 2021 on Today in LA

Storm evacuations and roadblocks

Here are some of the biggest influences from the storm.

  • 5 Freeway was closed early Thursday at Parker Road in Castaic. The road reopened around 3:45 p.m.
  • Still rain overnight led to flooding at a campsite in Leo Carrillo State Park in the Malibu area. The city said 22 people were rescued.
  • State Route 23 is closed at the southern end of State Route 1 (Pacific Coast Highway) due to mud and landslides. Caltrans crews check the north end of SR-23 in Westlake.
  • Two westbound lanes in the 27400 block of the Pacific Coast Highway were closed due to a tree falling.
  • A westbound lane on the Pacific Coast Highway, off Puerco Canyon Road, has been closed due to a mudslide, the sheriff’s Lost Hills station reports.
  • The Department of Transportation responded to a mudslide on Coldwater Canyon Road in Studio City where cars were stuck in the mud.
  • The Mullholland Highway in the Santa Monica Mountains is closed between Las Virgenes Road and Cornell Road due to heavy mudslides and rock falls on the road. Maintenance personnel from LA County Public Works remove rocks, mud and debris.
  • Both sides of the Pacific Coast Highway are closed in the Pacific Palisades due to a felled tree that overturned power lines, according to Caltrans. The southbound lane is closed at Temescal Canyon Road and the northbound lane is closed at Chautauqua Boulevard.

Photos: December Storm Photos from around California

Rain, snow and California’s drought

The remnants of all of California are experiencing some degree of drought this week, but conditions improved significantly in the two most severe categories.

The weekly report released Thursday shows that unusual drought was nearly eradicated after 23 percent of the state was under the most severe category a week ago. Nearly 33 percent of the state is in extreme drought, down from 79 percent last week.

In October, the National Oceanic and Atmospheric Administration announced that the Pacific Ocean was showing signs of a new La Nina, the back of El Nino’s ocean warming pattern, which tends to cause changes in the weather worldwide.

Forecasters said large parts of California would have a 33% to 50% chance of precipitation below normal, while only the northern part of the state had equal chances of above or below normal precipitation.

This map shows drought conditions in California on December 28, 2021.

But the mainstay has been trending farther south than usual under La Ninas. After a series of storms from mid-December, California’s total snow-water equivalent – a measure of how much water is in the snow package – jumped from 19% of normal to December 10 to 76% of normal on December 17, according to the latest U.S. seasonal drought outlook.

Although the current wet trend is positive, it is too early to know if it will last through January and February. The snow pack usually does not reach its maximum until April, and last spring there was minimal runoff because much of the water was absorbed by the drought-dried landscape.


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