@kcarruthers Today's polar vortex (10hPa) and jet stream (250hPa). Normally, the polar vortex is a nominally circular low pressure zone. The stronger vortex to the right of the first image is the low, rotating counterclockwise. It looks as though it may split into two separate vortices. The high pressure zone on the left looks unusual. Can any experts comment, please. The second image is the jet stream, which is way beyond wavy. It has two major cells and crosses the north pole.

@Wes_Montage @kcarruthers I'm not an expert but a slight enthusiast - there is indeed a split in progress, the stratospheric polar vortex is currently not in a strong state. Though that in itself is something that happens from time to time in normal circumstances; whether climate change is weakening the jet stream is still a matter of scientific debate I think(?). But certainly the broad picture of increased extremes is pretty settled.