~Most fascinating CTNP parks at the central US Canadian border
~Meanwhile, it was substantially warmer in the Canadian High Arctic due to moderate Cyclone stall injecting a lot of warm air, giving a weird scenario; High Arctic -20 C in clear blue skies for a week, 12 C warmer than seasonal.
From preceding EH2r article, Ellesmere Island reigned coldest spot in the world only for a few days, then a strong Cyclone SE of Canadian Archipelago stalled, injected North Atlantic air quickly nullifying its deep freezing status. This reorganized the centers of the now split Polar Vortex, one for each continent , of which the Canadian one's center reformed much further South, it has been there since February 10. Often the Canadian side Polar Vortex remained stable North of Hudson Bay, recent winter history made this Polar Vortex create rogue vortices. Not at present though. If we look at this NOAA animation above, we clearly see the Canadian PV become much colder at its center, not from Arctic origins, but self made, this is yet another frequent recent winters occurrence, and so in tandem the rest of the US, particularly Southern US deep froze without the Vortex being blamed, from what weather broadcasters usually call "Arctic dome... Arctic blast" hovering above them. 600 mb is the pressure level which represents the temperature of the entire atmosphere the most. It would be very accurate to posit the recent spate of record US cold weather to this circulation stall along with cold weather flow not moving fast:
2020 same period, center of the single by-continental Polar Vortex was much further North, favoring a warmer US, especially NE US coast. 2021 extreme warming of the Arctic is in fact the Climate Change news that never gets heard of, but this change plays havoc with traditional climate patterns, the smaller North American PV vortex of winter 2020-21 leads to rarely seen but now known results. WD Feb 18, 2021