Is this accurate? -- The recent data on the Jet Stream is interesting and explains this last winter very well. The pressure from the cold of the North and the warmth of the South spins the Jet Stream. Since the North is warming the pressure is waning -- causing the Jet Stream to slow and wobble. It is also too weak to hold back the power from the South from pushing up into Alaska and the Northwest. That means the ridge of cold air from the North Pole will drop across our continent when and where the push from the South dissipates. It might be that as the North Pole warms, ridges of cold air will drop farther and farther East, but the ocean currents will have effects too that might change that equation.