This Angular Momentum thing - and SSW aftermath. I was going to post jet stream images a day or two ago and ask whether the polar vortex has become the tropical vortex in many places.
Thanks, but I'm not that good at that part of meteorology(jet stream, stratosphere etc.), so I can't figure out which one is on gerontocrat's images. To me it looks like they mix with each other, but I still don't know if that's polar jet or subtropical jet in gerontocrat's post.
Nor do I! Join the crowd. That is the point. Is it all falling apart ? Did Mom break the weather ? Has Elvis left the building ?
ps: Meteorology is really, really hard even if you've got a big building full up super-computers.
The animation I posted above your first reply, yesterday was from 20mb and only regarding the recent SSW, it's gone and so is the effects on our weather.
The other answer is that you will most likely never see the
Sub
Tropical
Jet at 250mb in 2-D, where the
Polar
Front
Jet
typically is located. Adding a cross section from 15 February 2006, NH over east Asia. 10,000m is roughly 250mb and 14,000m is roughly 150mb.
And there are also
large changes in altitude involved, the PFJ is between 7-12km and the STJ is between 10-16km.
And the Hadley cell will probably not engulf the Polar cell any time soon, because Earth's rotational speed and the Coriolis forces will make that very difficult. We would need to have the same (slow) rotational speed as Venus for that to happen. Change does not equal collapse.
If you are interested in the angular momentum paradox and the STJ, you might wish to read this as a starter, by Anders Persson,
the troubled story of the subtropical jet stream starts at page
22 24.
Edit; wrong page number.https://www.rmets.org/sites/default/files/hisnews0215_0.pdfThat story will at least make all of us a bit more comfortable, realizing that this is not an easy and not even a settled issue, among meteorologists.