“Yesterday, we were hoping it will only be a one-in-20-year event, now it looks like a one-in-50-year event,” New South Wales Premier Gladys Berejiklian said at a televised briefing. People in parts of Sydney’s northwest were ordered to flee their houses in the middle of the night as fast-moving waters caused widespread destruction. Late on Sunday, about another 1,000 people were asked to evacuate, after Berejiklian said that some 4,000 people may be asked to leave their houses.