tonight. abc's will carr in california. >> reporter: tonight, a bone dry region thirsty for rain, getting too much too quickly. the weather creating havoc on california highways. a big rig slamming into two cars before sliding off the side of the freeway and down an embankment. four firefighters hurt in a crash after a driver spun out on a slick road and smashed into their truck. overnight, tractor trailers jackknifed and crushed. this car flipped over. the driver rushed to the hospital. traffic snarled for miles. and watch first responders make a daring swift water rescue on the l.a. river. tonight, mudslides also rushing across areas recently ravaged by wildfires. >> just a lot of mud coming down at a very rapid rate of speed now here in rice canyon. >> reporter: evacuations now underway in butte county. this man riding his horses to safety, not far from the city of paradise, the community wiped off the map from the camp fire. >> so, let's get to will carr, joining us from california. will, i know that there's still a risk of mudslides made even