low vis circling approach
Firstly fly instrument approach for opposite runway
B757 - flap 20 gr dn
A320/A330 - flap 3 gr dn
Level off at circling altitude.
When visual (prior to MAP), turn 45 degrees. Timing is 30s wings level or 45s at start of turn.
At end of timing turn downwind.
Timing from abeam the threshold is 3s per hundred feet AGL +/- 1/2s per knot of head/tail wind .
Turn base, select landing flap.
In the event of missed approach, must always fly missed approach for initial instrument approach.
Hope this helps.