Nation Tropical Storm Hilary drenches Southern California prompting floods, rescues across region: Updates August 20, 2023August 21, 2023Jordan Mendoza and John Bacon, USA TODAYComments Off on Tropical Storm Hilary drenches Southern California prompting floods, rescues across region: Updates Mud and boulders spilled onto highways, water overwhelmed drainage systems and tree branches fell in neighborhoods from San Diego to Los Angeles.