A surge of showers, thunderstorms, damaging winds and powerful surf will continue to affect parts of eastern NSW over the next 24 hours.

A strong and cool southerly change is sweeping up the NSW coast on Tuesday and will continue into Wednesday as a low pressure system deepens over the Tasman Sea. This strong surge of southerly winds is being accompanied by showers, storms and potentially damaging surf.

The amination below shows showers and thunderstorms building over eastern NSW on Tuesday in response to the southerly change and an associated upper-level pool of cold air.

Video: Composite satellite, radar and lightning observations showing thunderstorms over eastern NSW on Tuesday afternoon.

One striking feature on the animation above is a long line of storms oriented roughly parallel to the Great Dividing Range. This squally line of storms will continue to spread further north and east into Tuesday afternoon and evening, possibly reaching Sydney.

Severe thunderstorms are possible over eastern NSW on Tuesday afternoon and evening, with damaging winds the main threat.

Wind has also been picking up on Tuesday as the change moves its way up the NSW coast. These southerly winds will strengthen further into Wednesday as a low pressure system deepens over the Tasman Sea.

The video below shows the forecast southerly change moving its way up the NSW coastline on Tuesday, before southerly winds intensify further on Wednesday morning.

Video: Forecast wind speed and direction for Tuesday and Wednesday morning, according to the ACCESS-C model.

Damaging southerly wind gusts reaching around 100 km/h are possible along parts of the NSW coast between about Sydney and Coffs Harbour on Wednesday. The greatest risk of damaging gusts for the Sydney and the Hunter coasts will be in the morning, while damaging gusts could continue along the Mid North Coast into the afternoon.

Very heavy surf could also cause coastal erosion at south-facing beaches between Sydney and Sea Rocks from Wednesday morning, particularly around high tide.

Severe weather warnings have been issued for damaging winds and damaging surf in eastern NSW on Wednesday, so be sure to check the latest warnings for the most up-to-date information.