Surf from 6 to 10 feet is possible on Los Angeles and Ventura County beaches as early as Saturday night or Sunday, the National Hurricane Center said.
Heavy rainfall is expected across the Baja peninsula as well as the southwestern United States, with the potential for life-threatening desert flash flooding and mountain landslides, the hurricane center said.
Rosa, with maximum sustained winds decreasing to nearly 120 miles per hour (195 kph), was now a Category 3 storm, coming down a notch on the five-step Saffir-Simpson Hurricane Wind Scale.
Hurricane Rosa was on a track Sunday to drench northwest Mexico and parts of the U.S. Southwest, prompting tropical storm warnings for the Baja California coast and flash-flood watches for parts of four U.S. states.
The latest forecast from the National Hurricane Center (NHC) shows the storm moving west at about 12 miles per hour on Thursday before slowing down and turning to the west-northwest on Friday.
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This image shows the projected path of Hurricane Rosa on Friday, Sept. 28, 2018. It's expected to turn north, weaken over several days and make landfall over northern Baja California.
Meanwhile, Tropical Storm Kirk caused power outages and heavy flooding across the eastern Caribbean and forced flight cancellations, officials said Friday.
"Coastal areas are expected to received 0.25" to 0.50" of rain Tuesday into Wednesday, said Brandt Maxwell, a weather service forecaster.
"We are going to have a whole bunch of rain and it's. not the kind of thunderstorm rain that (is) associated with the monsoon (season)", Cerveny said.
Kirk had maximum sustained winds of 40 mph and was located about 270 miles south-southeast of Puerto Rico.