One of the fatalities was found in a vehicle that had gone underwater. According to the National Weather Service, these are the worst storms to hit the region in recent memory.
Orange, Riverside and San Bernardino received flash flood warnings which are still in effect as part of Los Angeles and Ventura counties were also under watch according to the National Weather Service. The rain was so furious that a parking lot in Los Angeles was turned into a waterfall.
In Southwest California, NWS warned that the region will be hard hit by the storms this season.
"It is likely the strongest within the last six years and possibly even as far back as December 2004 or January 1995," the weather service said.
Rainfall totals show that parts Of Santa Barbara County have already received around 7 inches of rain already in the past two days. Parts of Ventura County have seen totals of more than 6 inches.
More rains are expected over the weekend while parts of northern California can expect storms on Monday, or late on Tuesday.
The only concern now is how much impact the storms will have on Oroville Dam's already damaged spillway.
Earlier this week, authorities ordered evacuations over concerns that an emergency spillway at the dam could fail and threaten nearby communities. On Tuesday the evacuation was downgraded to a warning, allowing 188,000 evacuees from Butte, Sutter and Yuba counties to return home.