Sydney is getting ready for a major weather event that experts say only happens about once every 50 years, with severe conditions expected to hit the city over the coming days.

Forecasters are warning of a powerful system bringing intense rain, strong winds and dangerous coastal conditions all at the same time. Wind gusts could be strong enough to bring down trees and power lines, while heavy rainfall raises the risk of flash flooding in low-lying areas.

Authorities are urging residents to take precautions early, including securing outdoor items, staying indoors where possible, and avoiding unnecessary travel. Beaches have also been flagged as high-risk, with large waves and rough surf expected along the coastline.

Emergency services are preparing for a busy period, with crews on standby for potential rescues, property damage and road closures. Public transport and daily routines may also be disrupted as conditions worsen.

What makes this event unusual is not just the rain or wind alone, but the combination of multiple severe weather factors happening together at this scale. Officials say that while Sydney does experience storms, events this intense are very rare.

People across the city are being advised to stay updated with official warnings and to act quickly if conditions change, as the situation could develop rapidly.