An incredible visualization of winds aloft (and several other parameters can be seen at https://earth.nullschool.net/. Currently the jetstream (i.e. winds at 250 hPa altitude) are hitting around 230mph (360km/h).
Now put that together with my personal experience of extreme weather events both in NZ and ZA, the jet streams has _always_ been involved.http://squall.sfsu.edu/scripts/shemjetstream_model.html
ie. If I see a major stream coming near me... Big Stuff happens with the weather. If something extreme is happening with the weather, I check and a big stream is going very near by.
ie. I expect we will see more interesting stuff happening with the jet stream as the climate cooks.
https://insideclimatenews.org/news/31102018/jet-stream-clima...