But over the past two decades the jet stream has weakened. This is something we can measure," she said.
As a result, instead of circling the earth in the far north, the jet stream has begun to meander, like a river heading off course.
This has brought chilly Arctic weather further south than normal, and warmer temperatures up north. Perhaps most disturbingly, it remains in place for longer periods of time.
…"There is evidence for and against it," said Mark Serreze, director of the National Snowland Ice Data Center in Boulder, Colorado.
Read the entire article: Jet stream shift could prompt harsher winters: scientists - Yahoo News
