Hollywood star Chris Hemsworth has praised the heroes helping to save people in flood-stricken northern NSW and Queensland.

The Thor actor, 38, shared a series of photos to Instagram on Wednesday of the devastating floods, and thanked the emergency workers and everyday Aussies saving those stranded in their homes.

‘Absolutely devastating watching some of the worst floods in Australia’s history hitting Queensland and NSW,’ Chris wrote.

‘True heroes’: Chris Hemsworth (pictured on March 7, 2021) has paid tribute to the heroes rescuing thousands of people affected by flood-stricken northern NSW and Queensland

‘Heroic efforts by everyone involved in rescuing thousands of people who have been stranded,’ he continued.

‘Lots of love to everyone who has been affected and a big shout out to all who had a boat or jet ski and launched straight into rescue missions without hesitation. True heroes.’

It comes after Chris’ wife Elsa Pataky also shared a tribute to the brave Australians helping out during the catastrophic floods.

‘Northern Rivers and beyond had been hit by the worst floods in history. People have spent hours waiting on rooftops to be rescue,’ the Spanish actress wrote.

Tribute: The Thor actor, 38, shared a series of photos to Instagram on Wednesday of the devastating floods, and thanked the emergency workers and everyday Aussies saving those stranded in their homes. Pictured: Lismore submerged in floodwater on Tuesday

‘Thanks to all those who are able to help save people and animals stranded by the floodwaters, you are the real heroes.’

She added: ‘So amazing to watch how everyone pulls together in a disaster and helps the community. Our hearts go out to those affected by the floods. Stay safe.’

About 340,000 residents in northern NSW are under evacuation orders or warnings as unprecedented flooding leaves hundreds unaccounted for in the regional town of Lismore.

‘You are real heroes’: It comes after Chris’ wife Elsa Pataky (pictured) also praised the heroes helping save people in the flood crisis

The flood crisis has engulfed the northeastern part of the state, with major flood warnings in place for the Tweed, Richmond, Wilsons, Brunswick, Bellinger and Clarence rivers.

The Bureau of Meteorology warned NSW is in for more thunderstorms, heavy rain and damaging winds on Tuesday evening as extreme weather moves south.

NSW Emergency Services Minister Steph Cooke said 340,000 people in the northern rivers and north coast areas of the state are on high alert under evacuation orders or warnings.

NSW Premier Dominic Perrottet described the floods as a one-in-1000-year natural disaster, adding he expects waters to peak at about 16metres in Lismore. The previous record was just a tick of 12 metres in 1954.

Crisis: About 340,000 residents in northern NSW are under evacuation orders or warnings as unprecedented flooding leaves hundreds unaccounted for in the regional town of Lismore