Clear Air Turbulence
India Four Two shows a splendid grasp of Canadian geography, illustrated by his photograph of the Livingstone Range as seen from Cowley Airport. The glider pilots in the photo will be well acquainted with the properties of mountain lee wave which can smoothly elevate the glider to over 36,000 feet - or nearly rip your wings off in the rotor that lurks in the curlover! All of which can be exacerbated by jet streams flowing in contrary directions in a boundary layer. Although wave is often marked by lenticular clouds, if the air is dry they do not alway appear.
I believe this phenomenon does not necessarily show on radar. which should warn of the even more exciting conditions to be found in a cu nimbus..