Weekend Forecast: Heavy Rain, Thunderstorms, and Strong Winds Expected in NSW

Thunderstorms and rain are forecast for large parts of New South Wales at the tail-end of the weekend as wild weather returns to the state.

A pool of unstable cold air in the region is expected to whip up some winter thunderstorms later today and into the evening, Weatherzone reports.

The Bureau of Meteorology warns moderate to severe thunderstorms, with winds reaching up to 20km/h, are forecast for parts of the Central Coast, Sydney and the south coast including Newcastle and Wollongong.

Isolated storms are expected across central and eastern NSW, before spreading 'erratically' across the state and towards the coast.

Impacted areas should brace for heavy downpours, hail and strong wind as the storm 'packs a punch', according to Weatherzone.

The unstable cold air may bring cumulonimbus clouds, which are characteristic of heavy thunderstorms. These types of storms are unusual in winter.

Conditions are expected to settle tomorrow, with the stormy weather forecast across the border into Victoria and South Australia.

The deep low over the southern ocean could bring storms on Tuesday and Wednesday in south and central parts of SA and Victoria.

The city will return to pleasant winter weather by Tuesday, with higher temperatures reaching 18 degrees forecast for Thursday and Friday.

According to the source: 9News.