It will be a wet start to the weekend for Sydney with rainfall of up to 30 millimetres as a low pressure system from the north-west moves in.

Mike Pezzullo told the bushfire royal commission that the COVID-19 crisis has highlighted the need to manufacture and stockpile emergency supplies.

A patch of Lilydale bushland has been home to mob of about 30 kangaroos for years. But they are likely to be culled as their habitat is developed for housing.

NSW's national parks are reporting a surge in visits as people seek out nature to dispel the blues brought on by coronavirus.

The Berejiklian government says forecast impacts of climate change have forced it to amend its plan to raise Warragamba Dam, lifting the project's height by 17 metres rather than 14.