Debris flows brought on by the strongest atmospheric river of the season swept a car off a southern California highway and into the ocean and left roads submerged in sludge. While the heavy rains from the storm hitting the region have begun to ease, the risk of rock and mudslides on wildfire-scarred hillsides continues Friday since dangerous slides can strike even after rain stops. There is particular risk in scorched areas where vegetation that helps keep soil anchored has burned away. To the north, snow and ice caused major pileups on highways in Oregon and Washington, injuring at least 10 people. The West Coast storms are just the latest in a week of bad weather across the U.S.