The California Highway Patrol is responding to Mt. Baldy Road near Glendora Ridge Road on reports of extremely icy conditions on the roadway.
According to broadcast traffic, some vehicles, including a snow plow, are stopped on the road, possibly involved in an accident. One CHP officer cannot exit his vehicle with such icy, slippery conditions.
The La Crescenta area is reportedly seeing snow flurries, with snow levels dropping to around 1,700 feet, according to the National Weather Service.
A Freeze Watch will go into effect at 10 p.m. Wednesday night for much of Southern California until January 1 at 9 a.m.
A Freeze Watch occurs when temperatures will drop between 29 and 32 degrees, or less, for at least two consecutive hours.
Wednesday could see a slight chance of showers, with nighttime temperatures expected to get very cold with areas of frost in the forecast and a low of 34 degrees for the night.