Major interstates reopened in Southern California on Friday after lengthy closures caused by a cold storm that drenched the region and blanketed mountains and desert areas with heavy snow.

The notorious Grapevine section of Interstate 5 in towering Tejon Pass north of Los Angeles was finally opened after a 36-hour closure forced by dangerous conditions that set on Christmas night.

Vehicles were being escorted in both directions by California Highway Patrol units.

This photo provided by Greg Weber shows a snow covered Mount. Baldy in the San Gabriel Mountains, east of Los Angeles on Friday, Dec. 27, 2019. A winter storm has brought a deluge of rain and snow to Southern California. Snow has shut down the vital Interstate 5 in Tejon Pass through the mountains north of Los Angeles and dozens of miles of Interstate 15 from Baker, California, to Primm, Nevada. (Greg Weber via AP)
This photo provided by Greg Weber shows a snow-covered Mount. Baldy in the San Gabriel Mountains, east of Los Angeles on Friday, Dec. 27, 2019. A winter storm has brought a deluge of rain and snow to Southern California. Snow has shut down the vital Interstate 5 in Tejon Pass through the mountains north of Los Angeles and dozens of miles of Interstate 15 from Baker, California, to Primm, Nevada. (Greg Weber via AP)

The storm had largely departed by Thursday evening but cold air remained. The CHP said the closure continued into Friday because overnight temperatures fell into single digits and miles of roadway froze.

Vehicles are diverted off the northbound 15 Freeway to Kenwood Ave. on-ramp as Cajon Pass is shut down due to heavy snowfall in San Bernardino, Calif., on Thursday, Dec. 26, 2019. (Watchara Phomicinda/The Orange County Register via AP)
Vehicles are diverted off the northbound 15 Freeway to Kenwood Ave. on-ramp as Cajon Pass is shut down due to heavy snowfall in San Bernardino, Calif., on Thursday, Dec. 26, 2019. (Watchara Phomicinda/The Orange County Register via AP)

In the inland region to the east, the Cajon Pass section of Interstate 15 reopened after being closed for many hours. The major route for travel between Greater Los Angeles and Las Vegas also reopened in the Mojave Desert after a lengthy shutdown between Baker, California, and Primm, Nevada.

Adding to the traffic misery, accidents caused massive morning backups on icy State Route 14, a major commuter route between Los Angeles and high desert cities in the snow-blanketed Antelope Valley. Other high desert routes had similar problems.

The National Weather Service said the cold low-pressure system that brought the heavy rain and snow to Southern California was over Arizona and moving east. Rain and snow made roads and highways slick in a broad area stretching from Flagstaff and the Grand Canyon in the north to southeastern Arizona, including the desert along Interstate 10 east of Benson.

This photo provided by Greg Weber shows a snows covered Big Bear Lake in Big Bear, Calif., on Friday, Dec. 27, 2019. A winter storm has brought a deluge of rain and snow to Southern California. Snow has shut down the vital Interstate 5 in Tejon Pass through the mountains north of Los Angeles and dozens of miles of Interstate 15 from Baker, California, to Primm, Nevada. (Greg Weber via AP)
This photo provided by Greg Weber shows a snows covered Big Bear Lake in Big Bear, Calif., on Friday, Dec. 27, 2019. A winter storm has brought a deluge of rain and snow to Southern California. Snow has shut down the vital Interstate 5 in Tejon Pass through the mountains north of Los Angeles and dozens of miles of Interstate 15 from Baker, California, to Primm, Nevada. (Greg Weber via AP)

In California, I-5 rises to more than 4,100 feet (1,250 meters) in Tejon Pass between Los Angeles and the San Joaquin Valley, making it susceptible to storm closures, especially on the steep section known as the Grapevine.

Cajon Pass rises to more than 3,700 feet (1,128 meters) between the San Gabriel and San Bernardino mountains on I-15, which also carries commuter traffic in addition to people traveling between southern Nevada and Southern California’s cities.

Moisture wrapping around the low continued to bring some snow showers in the mountains in Southern California but that was expected to end.

Heavy storm clouds are reflected in a window over Los Angeles City Hall, left, while Chinese tourists take photos along a walkway at the Walt Disney Concert Hall on Thursday, Dec. 26, 2019. A cold and blustery winter storm unleashed a deluge of rain and snow on Southern California, triggering tornado warnings and snarling post-Christmas travel on major routes. (AP Photo/Richard Vogel)
Heavy storm clouds are reflected in a window over Los Angeles City Hall, left, while Chinese tourists take photos along a walkway at the Walt Disney Concert Hall on Thursday, Dec. 26, 2019. A cold and blustery winter storm unleashed a deluge of rain and snow on Southern California, triggering tornado warnings and snarling post-Christmas travel on major routes. (AP Photo/Richard Vogel)

Dry and warmer weather was expected in Southern California through most of the weekend. Another cold, low-pressure system was forecast to bring precipitation late Sunday through Monday before a drying trend sets in on New Year’s Eve.

Accidents caused massive morning backups on icy State Route 14, a major commuter route between Los Angeles and high desert cities in the snow-blanketed Antelope Valley.  (Dec, 27)
Accidents caused massive morning backups on icy State Route 14, a major commuter route between Los Angeles and high desert cities in the snow-blanketed Antelope Valley. (Dec, 27)
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