All I can tell you is what I have seen..
A hundred or so houses sans roofs.. These were jarrah and tin or tile..
City West is in the lee of a hill if the wind is south west... and below buildings if the wind is west or north west..
However the river seems to funnel the wind up its length..

The only recording I have witnessed was off Leuwin.. In an SS34 which I believe has a 28 foot waterline length weight of 5 tonne?.. We were running at 3.2 knots under bare rigging.. Dont know the wind strength to do that..