User:203.118.177.188 deleted an image I added, stating that it was not wave clouds but something called Kelvin-Helmholtz instability. That I can accept (as I'm not a meteorologist), though sadly there is no article explaining what this is. Unfortunately this editor is using an anon IP, so I can do nothing much to ask him/her about this except to post this message here and hope he/she sees it. This formation is not that uncommon in this particular area, must have something to do with the particular lie of the land, but the still image doesn't really convey what happens: a video would be a lot more dramatic, as the clouds really are very dynamic as they form and deform, looking exactly like waves as you see them in the sea (which is why I assumed they WERE wave clouds). The impression is that the peaks and troughs stay roughly where they are as the clouds drift through, rising and falling. I'd like to know more about this. Graham 13:56, 4 April 2006 (UTC)[reply]

Correction - after posting this the KH link came up blue, so there is an article after all - funny, a search didn't find it! Graham 13:58, 4 April 2006 (UTC)[reply]

Just an observation in the sky during a nice evening of April 2008[edit]

On 08 April 2008, I observed a series of nice wave clouds above a flat area in North-eastern Belgium (altitude of the ground in this area: ~ 20 m above sea level) where there is absolutely no mountain range. So, I have a question: how does it form in the high sky in the absence of mountains below ? Thanks for any answer if you have a clue.

Shinkolobwe (talk) 13:05, 9 April 2008 (UTC)[reply]

Internal Waves - Not Standing Waves[edit]

I changed the references so that they link to "Internal Waves" which is the accurate term. Standing Waves, of course, can only exist between refelctive barriers. Internal Waves appear to be "standing still" but are actually moving very slowly, because the speed of a wave is linked to the vertical rate of change of density the fluids. Mrdavenport (talk) 19:16, 10 February 2010 (UTC)[reply]