Overnight and early morning temperatures will plunge into the upper 30s this weekend as a frosty system from the north settles into Los Angeles.
The storm will churn up gusty wind and some scattered showers, but National Weather Service forecasters said the "main impact of the system will be to usher in much colder air across Southwest California."
The best chance of precipitation is Thursday, according to the Weather Service. But it will be on the light side—generally one-tenth of an inch of rain or less, forecasters said.
At the same time, the snow level will plummet rapidly—from between 5,000 and 6,000 feet to 3,000 feet by Thursday afternoon.
Gusty north-to-northwest winds will peak Thursday night into Friday morning.
By Thursday and Friday, highs will dip into the upper 40s to lower 50s while mountain temperatures will top out in the 20s and 30s, according to the Weather Service.
In Monrovia, Friday and Saturday night's low will be a chilly 33 degrees. The daytime high should stay in the mid-50s through the week, according to the Weather Service.
The coldest morning of the cold spell will be Saturday, when temperatures will drop to the 20s in many valley areas and single digits in the Antelope Valley, according to an advisory, which warned of "a potential freeze event."
"Temperatures across the coastal valleys are expected to drop into the mid 20s in some areas," forecasters said. "Even locations near the coast will dip into the low to mid 30s."
Along the coast, from San Luis Obispo to Los Angeles, high surf and astronomical high tides will cause flooding across beaches and beachside parking lots, according to the Weather Service.
A coastal flood advisory ill be in effect from 5 a.m. Thursday to 11 a.m. Saturday.
— This report was compiled with information provided by City News Service.