You are about to cross a Jet Stream with a decreasing temperature .How do you proceed to avoid turbulence?
Jetstreams are wide but not very high. Bank to 90 degrees and the two wingtips will be clear of turbulence, thus ensuring a smooth ride. Also, you'll be too busy to worry about things you can't change, like temperature.
Always bank left in the south and right in the north. Because of Coriolis and stuff.
Also, I always thought
Vb was the rate of progression of beverages towards the flight deck? It's inversely proportional to the proximity to ToD. Often confused with Vdt, the rate at which the captain opens the Daily Telegraph after ToC.