A cool air mass west of the cold front in the Tasman is causing a speckled mass of low level cloud over Victoria and Tasmania. The cold front and associated trough is moving up the Eastern Seaboard producing a thick deck of cloud. Significant thunderstorm activity is driving an area of mid to high level cloud about central Australia, close to an interior trough extending from the northern interior of Western Australia to the south east coast of the country. A high pressure system is pushing extensive low level cloud into the bottom half of Western Australia and the Great Australian Bight.