1040 hPa high near Tasmania and an upper low forced a deep trough or small low to move off the Central Coast. A house was blown down at Rosedale. Heavy flooding in the Curtis. And heavy damage to roads. Crop and stock losses. 356 mm of rain was recorded in 9 hours at Wonbah (near Mt Perry.).

This event is classified as an East Coast Low.

More about East Coast Lows
Harden Up
Bureau of Meteorology website
The Centre for Australian Weather and Climate Research report