The cold temperature is, even though it encompasses most of a continent, less general than intuition might suggest. There is a certain amount of energy in the atmosphere at any time, and there is no reason for that amount to change radically. Global warming does increase atmospheric energy over time. But quick changes are not likely. So, if some places are cold when others are warm, and the energy distributes itself. And, the atmosphere is not limited to the lower few feet, it has depth.
Imagine a ball. Grasp the ball in one hand. If you could consider the outline of your hand, that could be analogous to the Jetstream. The Jetstream generally separates cold on the polar side from warm on the equatorial side.
Sometimes you might grip the ball with fingers extended. That is more like the Jetstream in winter. Other times your fingertips might be used. The shortened outline of your fingers is like the Jetstream is summer.
But, even in winter there is space between the fingers. That represents warm air. So, if North America and Western Europe are both cold, there is still the oceans, Asia, and the entire Southern Hemisphere to consider.
While we freeze we must be aware global warming is still a problem.


Comments
frankbeswickJan 5, 2018
blackspanielgalleryJan 5, 2018
frankbeswickJan 5, 2018
But there is something that puzzles me. Seeing the weather forecast maps I know that the jet stream separates warm conditions from cold ones, but how does a flow of air at such a great height above the ground manage to affect conditions much lower down?