A short-lived coastal storm will bring waves as high as four metres to the Sydney, Illawarra and South Coast, prompting a hazardous surf warning.

A hazardous low-pressure system will sweep into the city on Friday night, bringing heavy rains, wild thunderstorms and monster waves.

A hazardous low-pressure system will sweep into the city on Friday night, bringing heavy rains, wild thunderstorms and monster waves.

A hazardous low-pressure system will sweep into the city on Friday night, bringing heavy rains, wild thunderstorms and monster waves.

A hazardous low-pressure system will sweep into the city on Friday night, bringing heavy rains, wild thunderstorms and monster waves.

A hazardous low-pressure system will sweep into the city on Friday night, bringing heavy rains, wild thunderstorms and monster waves.

Sydney is preparing for wild weather as a super storm begins to move north, set to bring heavy rain, and wild surf for large parts of the coast.

Sydney is preparing for wild weather as a super storm begins to move north, set to bring heavy rain, and wild surf for large parts of the coast.

Sydney is preparing for wild weather as a super storm begins to move north, set to bring heavy rain, and wild surf for large parts of the coast.

Slow-moving, dangerous thunderstorms are causing flash flooding in Sydney and the Central Coast.