The rain and high tides could cause problems along the Orange County coastline.
Southland beachside communities are preparing for possible flooding due to a powerful storm system.
The Southland is preparing for the first of two winter storms expected to roll through the area beginning Wednesday night.
Fire officials Thursday were on scene of a water main break in West Hollywood.
The flooding was first reported shortly after 1:30 p.m. near the Roscoe Boulevard ramps of the 5 Freeway, according to CHP officers.
Flash flood watches were expected to be in effect until 11 p.m. Friday for Riverside and San Bernardino counties along with a flood watch for Los Angeles and Ventura counties.
Heavy rains and flash floods have been reported in northwestern Riverside County.
A water main break early Friday morning flooded several blocks of a neighborhood in the mid-Wilshire District, officials said.
Police are seeking the public’s help in the search for vandals who flooded a Long Beach church building early Sunday.
A second night of heavy rain brought traffic headaches to Southland roadways Tuesday.
A broken six-inch water main Tuesday afternoon flooded and temporarily shut down a major thoroughfare in Northridge.
A sheared fire hydrant dumped more than 100,000 gallons of water into a Ralphs supermarket in Castaic Thursday evening, according to authorities.
Three homeless people were uninjured Thursday after their campsite along the Los Angeles River near Cypress park was almost submerged in water.
Residents and city officials along the coast are preparing for a second day of high tide Friday.
Some Long Beach and O.C. residents are preparing for another day of ankle-deep seawater in low-lying coastal communities as unusually high “king tides” pulled the Pacific farther ashore than normal Thursday.