Officials urged motorists to slow down as fog descended on Southern California roadways early Monday.
The National Weather Service said a patchy dense fog was expected to affect portions of Los Angeles, including the San Fernando Valley, before 10 a.m. on Christmas Eve.
"Motorists should slow down and use low beam headlights if encountering dense fog," NWS Los Angeles tweeted.
In West Covina, where a fatal wrong-way crash had just occurred, California Highway Patrol Sgt. Karie Mendoza also asked drivers to take precautions.
"Drive slowly please… It’s very hard to see out here, so be careful," Mendoza said.
Patchy dense fog will occur across portions of the San Fernando Valley early this morning. Visibility 1/4 mile or less at Bob Hope Airport in Burbank. Motorists should slow down and use low beam headlights if encountering dense fog. #cawx #Socal #LAweather pic.twitter.com/gcqImddShY
— NWS Los Angeles (@NWSLosAngeles) December 24, 2018
At 7 AM, dense fog had reduced visibilities in parts of Orange and San Diego Counties this Christmas Eve morning. The fog will lift and the visibility will improve through 10 AM. #cawx #SanDiegowx pic.twitter.com/RCIwq1ygwh
— NWS San Diego (@NWSSanDiego) December 24, 2018