Southern California is experiencing an unprecedented winter storm, with heavy snowfall and flooding prompting search and rescue missions across the region.

The National Weather Service has described the storm as the “strongest ever” to hit the Southland, with snow falling as low as 1,000 feet in some areas.

Flooding has closed the 5 Freeway in Atwater Village and Sun Valley, while dry riverbeds that appeared in the 1978 movie Grease are now swollen with floodwaters.

The storm is expected to bring heavy rain and gusty winds to the region, making travel hazardous and increasing the risk of mudslides.

Search and rescue teams have been deployed in areas that are prone to flooding, while authorities are warning residents to take extra precautions.

The storm has brought an unexpected winter wonderland to the region, with snow blanketing higher elevations in the San Gabriel and San Bernardino Mountains.

The snowfall has created a unique photo opportunity for many Southern Californians, who have been sharing their pictures on social media.

The storm is expected to continue for the next few days, bringing more snow and rain to the region. Residents are advised to stay updated with the latest weather reports and take necessary precautions.