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I was in Queenstown around this time last year. These mountains are the Remarkables mentioned on the article. Having no tall mountain range in South Australia, it was the first time I've seen lenticular clouds. Queenstown Airport is kind of just out of frame to the left in this image.



And down at the other end of the valley in which Queenstown is located:



Excuse the picture quality ...I'm out in the country bike riding this weekend and doing this post on my phone so Ive had to let the forum image manager compress these mages down.

[quote=southlander] ... lenticular clouds[ ... /quote]

Neat cloud pix.

Lennies are beautiful, but like undertow at the beach, they can forecast scary sinkers and unexpected turbulence even many miles down wind of the ridge and below the visible cloud forming layer(s). Sail planes (gliders) love 'em because they can see the up vectors and avoid the down-draft side

There's two directions and types of left-to-right wind shown there. Good example for mountain flying lessons.

The pictures look great to me! I wish it was so green when I was there! Nice shots.

Presumably there must be a strong updraft on the side where the leading edge of the lenticular cloud forms, and a strong downdraft on the opposite side? I saw lenticular cloud in Wanaka too. Many layers, a kind I've not seen before.

Lenticular sunset by RobGeraghty, on Flickr

New Zealand grass is just something else. It’s so intensively green lime and colour-wise unlike anything I see in Oz. Viewers probably think I’ve overdone the saturation slider but that that’s the way it is, at least in winter/spring.

Had some snow the first night I was staying in Queenstown that settled on the range opposite Queenstown (Cecil and Walter Peaks and along that side all the way to Glenorchy). Most of it melted again after 24hrs. Although I had intended to give myself a day off driving, I just had to make the most of the opportunity and drove that day to Glenorchy and beyond. Another 120km or so on the day ’I wasn’t driving’ contributing to the 4500km I did solo over a month covering both islands.

Back on topic, the original article on the Jetstar work up of their procedures for low vis gps nav at Queenstown included defining and gaining approval for a climb out path different to the normal path in the event of an engine failure on takeoff that the crew could immediately jump to in their nav system and that addressed the terrain vs the diminished rate of climb question!

A perfect example of using intelligent waivers of 'The Rules' to build safe, alternative special procedures. (If only politicians were as pragmatic.)

The NZQN approaches are interesting studies of navigation and performance limits.

There are quite a few of 'em around the world. Here's one on the 'top half' at Narsarsuaq, Greenland (BGBW). No PAPI. Imagine the engine-out missed approach or departure which can be just as hairy.

http://vprimera.weebly.com/uploads/1/2/2/7/12279223/bgbw.pdf



Quite different from transportation hundreds of years ago. Say, like a Viking long boat arriving at Narsarsuag way back then.

Thanks for the video! Not as restrictive as Queenstown, but pretty challenging with all the snow and cloud.