now particular ly vulnerable. up to six inches of rain is possible. abc s brandi hitt starts us off. reporter: a supersoaking storm slamming california. mud flowing in camarillo northwest of los angeles. a race to keep those culverts clear any way they can. with machines, even pulling rocks out by hand. families like anthony s are keeping a close eye on the mountains. i wasn t scared until now. reporter: rocks falling in santa barbara covering this highway and wreaking havoc on the road. at least three injured in this three-car pile-up. look at this truck, dangling from a freeway overpass. the ground already saturated after weekend downpours brought mud slides that closed ten miles of the pacific coast highway. in glendora, workers moving massive concrete rails to protect these homes sitting below a mountainside that could give way at any moment. when they say mandatory, we re out of here. reporter: this neighborhood
their homes from a mud slide. let s hope it comes gradually versus heavy downpour. reporter: the rain drought-ravaged california has been praying for is here. the problem is that it may be too much too fast for areas with charred hillsides from recent wildfires. it takes just half an inch of rain in an hour to cause flash flooding in areas scorched by fire. people here are ready to evacuate at a moment s notice. get the family out, the dog out, grab the computer, the pictures. just like you did in the fire. reporter: in the san francisco bay area, river and creek levels are rising along with people s anxiety. in camarillo, an hour north of los angeles, mud is already flowing down a hillside hours before the expected heaviest rain. weekend downpours triggered a rock slide on the pacific coast highway where a ten-mile stretch remains closed. the rain causing major headaches on the road. california highway patrol responding to more than 100
vulnerable. up to six inches of rain is possible. abc s brandi hitt starts us off. reporter: a supersoaking storm slamming california. mud flowing in camarillo northwest of los angeles. a race to keep those culverts clear any way they can. with machines, even pulling rocks out by hand. families like anthony s are keeping a close eye on the mountains. i wasn t scared until now. reporter: rocks falling in santa barbara covering this highway and wreaking havoc on the road. at least three injured in this three-car pile-up. look at this truck, dangling from a freeway overpass. the ground already saturated after weekend downpours brought mud slides that closed ten miles of the pacific coast highway. in glendora, workers moving massive concrete rails to protect these homes sitting below a mountainside that could give way at any moment. when they say mandatory, we re out of here. reporter: this neighborhood devastated by wildfires earlier this year. that compounds the danger. it take