Here is a fun annotated #GFS loop of the upcoming stratospheric #PolarVortex split & #SSW event from a #PV view.

Almost a symmetric vortex split on the 700K isentrope as ridges on opposite hemispheres both aid thinning & fracture of PV at the #NorthPole.

Fantastic evolution! pic.twitter.com/zHDqp07Fgu

— Philippe Papin (@pppapin) February 10, 2018