A 1009 hPa low developed on the Sunshine Coast by3pm 8th and moved south while intensifying to a 1001 hPa low over southern suburbs of Brisbane at 3am 9th.

Maximum sustained winds NE/38 knots at Cape Moreton and ENE/50 knots with gusts to 65 knots at Cape Byron. Caloundra recorded 239 mm of rain in 24 hours. At 9am 9th low was 1001 hPa and just to the north of Yamba after which it deepened and moved to the SE. Lord Howe Is at 3pm 9th had 40 knot winds from ESE with gusts to 54 knots.

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