(Reuters) – Coastal communities in California faced another day of towering waves and possible flooding on Saturday as officials issued evacuation orders in some areas and warned residents to stay off beaches and coastal roadways. The National Weather Service in Los Angeles forecast significant flooding in low-lying coastal areas with powerful waves and strong rip current posing an “exceptional risk” of drowning and damage to structures like piers and jetties. Waves as high as 20 feet (6.1 meters) could wreak more havoc on waterside homes in vulnerable communities along much of the California …