How does the jet stream work, and how is it changing as fall sets in?

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How does the jet stream work, and how is it changing as fall sets in?
By Matthew Cappucci September 29

Jet stream visualization on Sept. 29. (Ventusky.com)

Mother Nature has flipped the calendar to fall. The days are getting shorter, the nights are feeling crisper, and at any moment now Walmart will throw up all its Christmas displays. We all know the seasons are changing, but what exactly does that mean? It all comes down to one thing: the jet stream.

https://www.washingtonpost.com/news/capital-weather-gang/wp/2017/09/29/how-does-the-jet-stream-work-and-how-is-it-changing-as-fall-sets-in/?utm_term=.51b7124435b2