With very limited background in the physics of air and weather, this question occurred to me for no particular reason. With that in mind, a simplified answer would be much appreciated.
This weatherman's account is all that I have to go by: https://youtu.be/aiYyCurh_SU
Although, it was not clear to me as to why we have converging and diverging air aloft. I have a few other minor questions but I think that which was stated in the Question Header will make things clearer.
Thank you for your time.