Cool time-lapse video of wave cloud generated by a northwesterly bouncing up off a range of hills in Otago:
The northwesterly gales we had here last Sunday generated a pretty spectacular wave over Wellington. This is from my place looking southwest toward the city in the late afternoon:
Note the pine tree leaning with the wind at the bottom of the frame. Would have made for an awesome sunset but the weather closed in and started raining about ten minutes after I took the photograph and the cloud was hidden from view.