Grist: A lot of wild weather has afflicted North America this year: deluges in Colorado and Alberta, a heatwave in Alaska, and bitter cold in Florida. But there`s a high-altitude link between each of these unusual events which itself might be tied to climate change: erratic behavior by the polar jet stream.
This famous current of air zips eastward at high altitudes from the continent`s West, normally passing over North America somewhere near Seattle. It is one of two jet streams in the Northern Hemisphere...