January 20 2017, 700 mb temperature measurements captured a cold mid sized Arctic Polar Vortex with 3 vortices, the larger yellow line expanse is -20 C isotherm, within are significant colder vortices having temperatures lesser than -30 C, at their center are CTNP's (Cold Temperature North Poles), all with winds turning counter clockwise around them. We note Alaska and near North of URALS Russia, having one, very unlike 2018 winter to date.
January 16 2018, A very different scene indeed, Urals and Alaska were much warmer, not only on same yearly days but throughout the winter to date. We notice the Russian Vortice CTNP being coldest in the World, but it was not always so. It has been rebuilt from a devastating North Pacific Cyclonic merge, at one time there was no significant vortex on that side, a few weeks back with Upper Air temperatures exceedingly warmer. These are the times when vortices regularly disappear in the Arctic from warm Cyclonic Northward incursions, particularly driven North by smaller in size vortices .
Notice the Canadian side Vortice in the process of vanishing, Ellesmere Island being warmer than Disko Island Greenland, quite astounding.
January 17 2018, we note the Russian vortice stable and cooling a bit. But the Canadian Arctic Archipelago vortice receiving a final literal blow of warm air coming from the North! An amazing feature, this of course changes weather patterns throughout North America. WD January 21,2018