Much of Southern California is under a flood advisory as rain makes travel dangerous, while a snowstorm heads for the Northeastern U.S.

Water flooded the parking lot of a shopping mall in Glendale, California, as powerful winter storm swept southern California on Christmas Eve.Video filmed by Roger Justin Caffier at Glendale Galleria shows water cascading down a flight of stairs onto a completely inundated parking area.

Another powerful storm system that could soak Southern California with its wettest Christmas in years rolled into the region Thursday, potentially causing more flooding and mudslides a day after heavy rain and gusty winds were blamed for at least two deaths.

A strong storm system that brought relentless winds, rain and snowfall to California this week was expected to ease Friday, but there was still a risk of high surf along the coast, flash flooding near Los Angeles and avalanches in the Sierra Nevada.

Coastal communities in Southern California braced for more rain and flash floods even as a powerful Christmas storm began to ease on Thursday evening, with a state of emergency still in place for Los Angeles and neighboring counties.

Evacuation warnings are still in place for communities such as Wrightwood and Lytle Creek, which saw significant storm damage.

The California Highway Patrol reported a seemingly weather-related crash south of Sacramento in which a Sacramento sheriff’s deputy died. James Caravallo, who was with the agency for 19 years, was apparently traveling at an unsafe speed, lost control on a wet road and crashed into a power pole, CHP Officer Michael Harper said via email.

Residents of Los Angeles spent the day before Christmas under rain showers and winds of around 40 mph, while the New England area braces for heavy snow later in the week.

Residents in the Malibu area are bracing for heavy rain as a Christmas week storm is set to arrive in Southern California on Tuesday.