By the end of week 1 into week 2, we will see things flip. Arctic high over the pole with a ring of subpolar lows. This high forms between the splitting vortices. Crazy to think that this vortex split/chaos up above creates a rather textbook pressure appearance (z-cells). pic.twitter.com/LIsKBBF390

— Anthony Masiello (@antmasiello) December 31, 2018