A SURFACE trough developed and deepened over the interior mainland and interacted with an upper trough, bringing showers and thunderstorms to inland Queensland, north-eastern South Australia, Victoria and New South Wales with weekly totals of 50-100mm.

Between 10 May and 13 May, the surface trough moved eastwards and triggered widespread showers along the east coast, resulting in weekly totals greater than 200mm along the south coast of NSW, recording the highest daily total of 136mm at Jervis Bay Airfield in the 24 hours to 9am on May 13.

Much of the east Australian coast had been experiencing steady rainfall due to a moist onshore flow directed by a high-pressure system.

Weekly totals of 25-100mm were recorded in parts of the Qld coast, and 15-50mm along the Tasmanian coast.

A trough and cold front brought rainfall to the far south-west of Western Australia with weekly totals of 25-50mm.

The highest weekly total at a bureau gauge was 311mm at Jervis Bay, NSW.