The showers should be over by Thursday morning and Orange County residents can look forward to a dry New Year's Day, according to the National Weather Service.
A quarter-inch to a half-inch of rain will douse the region, but winds and cold temperatures are the real elements to watch.
The average high historically for this week at John Wayne Airport is about 66 degrees. Thursday's highs will be in the mid-50s.
Also, lows are taking a dip as well with temperatures in the upper 30s, compared to the upper 40s average from last year.
Wednesday's storm wreaked havoc on local streets.
Three people were sent to the hospital following a two-car crash in the morning rain on the southbound San Diego (405) Freeway at Harbor Boulevard, authorities said.