Mountain Wave - even the BBC is excited 17th Jan

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jack.h...@gmail.com

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Jan 17, 2025, 11:51:43 AMJan 17
to Weather and Climate

Not sure why they call them 'rare'.

One of my static pictures shows two types of wave, atmospheric and sea.  (looking into wind).

Another shows shafts of sun through a cloud gap.

25-01-17-090-Nairn.jpg
25-01-17-120-BlackIsle.jpg

25-01-17-138-BlackIsle+windarrow.jpg

Time lapse illustrates clearly how cloud forms consistently in one place and similarly dissipates on the downwind side of the cloud.
Today's video:      https://youtu.be/Vv7jx9LiLao

Conventional wisdom is that the wind should be more-or-less perpendicular to the generating mountains.  My gliding experience and these timelapses show that the wind maybe be as much as 45 degrees away from perpendicular but the 'standing' wave clouds adopt the orientation of the generating source.  The edge of dissipating cloud [downwind edge] is often more 'cleanly' marked.

Jack

jack.h...@gmail.com

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Jan 17, 2025, 12:22:48 PMJan 17
to Weather and Climate
Bernard Burton's satpic shows the wave clouds.


Surprisingly, Bernard doesn't draw attention today to the orographic waves as he usually does.

Jack

Ashley haworth-roberts

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Jan 17, 2025, 1:55:40 PMJan 17
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