Yet another storm is hitting Southern California on Friday, and though there won’t be nearly as much snow as two weeks ago, rain presents its own dangers.

Steady rain is expected Friday and Saturday, prompting the National Weather Service to warn of possible “significant road/urban & small stream flooding.”

“It won’t be one of those cold, wintery storms,” said KTLA Meteorologist Kaj Goldberg. “But nonetheless, we will see measurable rainfall.” 

The issue could be compounded by the relatively warmer rain falling on snow that has already amassed in San Bernardino County and other mountain communities in Southern California.

The additional precipitation is likely to melt some of the snow, creating even more runoff, and in some cases, the rain might make the snow atop buildings even heavier, increasing the likelihood of roof collapse.

With the ground already saturated from previous storms, the NWS warned the public to protect their property from flooding, adding that drivers should never try to cross flooded roads.

Another concern is mudflows, including near the Fish Fire burn area in Duarte. The area is under a mudflow alert through 1 p.m. Saturday.

While the area is currently at the green level, prompting no restrictions, “residents are encouraged to monitor weather conditions and be alert to changes,” the city said in a news release.

Beaches may also be affected, warned Los Angeles County Health Officer Dr. Muntu Davis.

“Bacteria, chemicals, debris, trash, and other public health hazards from city streets and mountain areas are likely to contaminate ocean waters around discharging storm drains, creeks, and rivers after the rainfall,” the county said in a news release. “Individuals who enter the water in these areas could become ill.”‘

That advisory remains in effect until 10 a.m. Monday.

While this storm will primarily bring rain, some snow is still expected above 10,000 feet in elevation, the NWS said. Below 5,000 feet, snow is expected to melt, and above that line, there is “significant avalanche danger.”

Mountain travel should be avoided, the agency added.

In response to the threats, President Joe Biden approved an emergency declaration for multiple California counties, including Los Angeles and San Bernardino.

“Specifically, FEMA is authorized to identify, mobilize, and provide at its discretion, equipment and resources necessary to alleviate the impacts of the emergency,” the White House said in a statement.