National weather forecast for Wednesday June 5.

If global emissions remain high, skiing and snowboarding will disappear in Australia by 2080 at all but two resorts. If emissions are rapidly reduced, snow sports will remain strong throughout the Australian Alps.

An extreme weather warning has been issued for parts of Sydney after a deluge on the south coast flooded roads and houses.

National weather forecast for Thursday June 6.

Communities are being urged to prepare for evacuation over coming hours as the NSW downpour continues.