
Los Angeles County health officials issued a warning Monday for beachgoers to avoid swimming in the Pacific Ocean as a drenching storm fueled by atmospheric pressure moved into Southern California.

That heavy downpour from the storm can cause bacteria and chemicals to flush into the ocean.
The “ocean water quality rain advisory” for beaches lasts until Thursday at 1 p.m. or at least 72 hours after significant rainfall. Officials could extend that deadline depending on conditions.
Runoff from stormwater can carry dangerous debris and trash from neighborhoods into the water, potentially making swimmers sick if they come in contact.
County health officials urged beachgoers particularly to avoid hazardous runoff near storm drains and rivers.
“Bacteria levels may remain elevated up to 3 days depending upon the intensity of the rain and the volume of runoff,” said the county health department on its website. “Elevated bacteria levels in ocean water may cause illness, especially in children and the elderly.”
You can read more information on beach conditions from L.A. health officials here.