~Coldest Vortices weakest compared to last 4 years
Based on CMC January 25 0000 UTC 700 mb data measurements, because it is closest to 600 mb, the actual average temperature of the entire troposphere, along with below 500 mb height, implicating lower atmospheric circulations. We see two important Cyclones typically going Northeastwards, the furtherest North one is following a " northern warming" path, heavily influencing the temperature of the Arctic Ocean. The elongated aspect of the North American vortex is a sign of winter weakness, readily identified by its temperatures, once called by weather TV presenters the "Polar Vortex"was really a vortice(s) within the Polar Vortex having temperatures well below -30 C forming at a Southward location. As we can see here , none to be found in North America but for a faint one North of Alaska, which has finally got a bit colder.
**Mongolia and high elevated regions ( about 1 kilometers or more ASL) have incomparable pressure temperatures, while I aim to read at 600 mb level, but only do 700 because there is not many 600 mb charts produced, the Equivalent Mongolian pressure level to 600 mb is 450 mb, because at that pressure height lies close to the average temperature of this thinner troposphere. It is best to stick to charts from Polar stations lower than about 600 meters altitude. Jan 30 **WD January 25-26 (second map changed on 26) 2018