A321 VH-VWN on Thursday 23 July is an example of a severe BNE fog-related delay.
It's operating JQ813, the 0815 hours BNE-SYD that was not in the sky until 1147 hours. Arrival at 1302 hours will be 192 minutes behind schedule. This is largely because its 'first of the morning' 0600 hours SYD-BNE (JQ810) did not take off until 0931, presumably after the fog had cleared in Brisbane, with arrival in the Queensland capital at 1048, 198 minutes late.
Note how thus far it's only picked up six minutes of the earlier huge delay, despite having a 45 minute turnaround allowance in BNE.
JQ565, the 0710 hours BNE down to MEL was worse, with takeoff at 1158 hours for A320 VH-VGO. Arrival should be approximately 1406 hours, 271 minutes late. This was because overnight, it operated JQ965 from PER to BNE as noted in the previous post, but this had to divert to OOL. In Melbourne, the aircraft appears to be forming JQ564, the 1015 hours MEL back up to BNE optimistically forecast as departing at 1425, which is impossible.