This is an amazing animation of the Stratospheric Warming now being forecast by the GPS model made by @Rectos
Here is my animation of the 00z GFS, showing the downard propagation of the warming in 3D, from 10mb downwards. Looks like a wave 1 displacement SSW beginning. but of course only in the models atm, in the FI. lets not forget that
As it is temperatures are rising as the polar vortex comes under pressure:
This is Stratospheric temperatures at 70, 50, 30, 10, 2 and 1 h.p.a..