Comments on: #wavewatching in the sky https://mirjamglessmer.com/2019/02/07/wavewatching-in-the-sky/ Dr. Mirjam S. Glessmer Tue, 12 Feb 2019 06:57:08 +0000 hourly 1 By: Mirjam https://mirjamglessmer.com/2019/02/07/wavewatching-in-the-sky/#comment-2587 Tue, 12 Feb 2019 06:57:08 +0000 https://mirjamglessmer.com/?p=10099#comment-2587 In reply to Joe Buchanan.

Over on Twitter there was some discussion on this and it turns out that there are arguments for either. We’d have to know more about temperature and humidity profiles to determine which one it is. But it’s fascinating nevertheless! :-)
Did you see my post on roll waves and the hydraulic jump animations? Thought you might be interested in those

]]> By: Joe Buchanan https://mirjamglessmer.com/2019/02/07/wavewatching-in-the-sky/#comment-2586 Mon, 11 Feb 2019 22:26:43 +0000 https://mirjamglessmer.com/?p=10099#comment-2586 I would have guessed that the clouds are at the peaks – when the air moves upward into low pressure/colder zones so the water vapour condenses to form clouds. But I’m not a meterologist so I’d love to know which is right!
Where I live (Paekakariki in New Zealand) there is a popular hang gliding site. A friend who is a hanglider pilot told me that wind waves are part of the attraction. The South Island is about 50 kilometres away, across Cook Strait – the seaway between the North and South Islands of New Zealand. As the wind blows over a high point in the South Island a wave is formed, that bounces up and down across the sea until it reaches the North Island, getting larger with each bounce. If the period is right the hangliders can get lift from the upward face of the wave, apparently much greater lift than from the usual convection currents or wind lifting over topographic features.

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