From top-down, big-picture thinking on the climate system, it is clear that when Arctic temperatures increase much faster than lower latitude temperatures the jet streams must slow down and become wavier; in fact I have discussed this since 2010. Peer-reviewed science is finally catching up. In this video (plus next), I chat on jet streams (planetary waves; Rossby waves) get stuck in place, with large ridges and troughs, causing extreme weather events via Quasi-Resonant Amplification.
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