A storm system moving across Southern California was expected to bring continued scattered showers and tough driving conditions Friday.

Most areas were likely to see some light rain throughout the day as a weak cold front moves through the region, the National Weather Service stated on their website.

Drivers were warned to be extra careful as the wet weather can make for dangerous driving conditions.

A jackknifed big rig temporarily shut down a rain-slicked 91 Freeway early Friday morning.

The big rig was towed away following the multi-vehicle crash near Lakeview Avenue, allowing traffic to get moving again by 5 a.m.

In Thousand Oaks, a SigAlert was issued when another big rig overturned on the northbound 101 Freeway and came to a stop on the concrete center divider near the Borchard Road offramp.

The big rig had collided with a flatbed truck about 3 a.m. and was expected to cause major delays Friday morning, according to the California Highway Patrol.

On Saturday, another storm system was expected to approach the region and bring more widespread rain along with a slight chance of thunderstorms, the Weather Service stated.

The possibility of thunderstorms also means the threat of heavy rain and the potential for mud and debris flow, especially in and around recent burn areas.

Snow levels were expected to fall to about 6,500 feet, with significant accumulation possible above 7,000 feet, according to the Weather Service.

The showers were likely to diminish on Sunday as the system moves quickly out of the region.