Lenticular clouds

These form within the crests of orographic (or lee) wave-trains, over and downwind of hills / mountains / islands, provided of course that the air is humid enough.

The clouds are formed because air cools as it is forced to rise and if condensation takes place, lens-shaped clouds are observed with clear space in between the elements. The cloud forms within the upwind leg of each wave-crest and dissipates (evaporates) on the downwind leg: the air is therefore flowing through the cloud, with the cloud itself staying quasi-stationary.

Change in the cloud requires an alteration in the wind-flow or in temperature / humidity of the environment.

Sometimes, under very special circumstances, a "pile of plates" is observed, where lenticular clouds are stacked vertically.

https://www.google.co.uk/search?q=le...2bIYuzUbHppugF

The most common form of wave-forced cloud is perhaps Altocumulus lenticularis (Ac len), but lenticular cloud forms are found at all levels.

Standing wave motion can also lead to a previously uniform sheet of cloud developing a lenticular appearance, and on occasion, complete dispersal.

Just because the standing wave is thousands of miles in diameter there is no reason to think that the gyroscope isn't the same column of potential energy. The trick for the thaumaturge is for him to guess the day it stops. or in this case, the day it starts:
http://earthobservatory.nasa.gov/IOTD/view.php?id=87324

There is nothing quite as potential as a Blocking Low is there?
Symmetrical to the four winds -perfectly balanced. Nobody considers them unstable until they hit shore.

Unless like these they just keep ****ing about:

http://www.woksat.info/etcxaasxx/asxx15010706.html