There’s a major storm and flooding situation across Southern California right now, including Los Angeles, with flash flood warnings, heavy rain and mudslide risks in effect through Christmas Day and beyond. I know that Six Flags Magic Mountain, Knott’s Berry Farm and Warner Bros. Studio Tour Hollywood were closed on Wednesday, December 24.
Also Disneyland closed early
But at this moment there are no credible reports that Universal Studios Hollywood or Universal CityWalk have been closed specifically because of these current flood warnings.