Silberfuchs,
I must dive into your wealth of knowledge and get a clarification to some typhoon stuff. You mentioned that once a typhoon is spinning that they may cross the equator.
If the corriollis force causes a low to rotate counter clockwise in the northern hemispehere and clockwise in the southern hemisphere, and there is zero corriollis at the equator, how can a typoon cross it? Would it then start to rotate in the other direction when changing hemispheres? It would seem to me that when you remove one of the three main causes that a typhoon needs to start (in this case the rotation of a deep low pressure)
it would just dissipate and become a geostrophic wind at the equator.
Keep the good info coming.