Australia faces weekend deluge as colliding weather systems spark severe storms

Australia's storm season is intensifying, with south-east Queensland experiencing record October rainfall and flash flooding. A strong cold front moving east from Western Australia will combine with humid tropical air, delivering a band of rain from South Australia through Victoria to Tasmania on Saturday. The leading edge of this band may produce severe thunderstorms, including possible squall lines and rotating supercells, especially over central Victoria, inland New South Wales and north-east Victoria on Sunday.

Capitals will see storms at different times: Melbourne in the morning, Canberra in the afternoon, and Sydney late afternoon. While the southern states will stabilize by Monday, New South Wales and Queensland are likely to endure further severe storms, and tropical regions may see another outbreak later in the week. The unusually wet conditions are linked to a rare blocking high and the interaction of subtropical and polar jet streams, offsetting the typical drying influence of El Niño.