How Would You Define a Jet Stream? The jet stream, one of the most dramatic forces of nature, was discovered during World War II when aviators first tried to cross the Pacific. This strong wind ...

It’s the "Bleak Midwinter" in the Northern Hemisphere – so, in case you’ve been living under a well-insulated rock, cold weather and snowfalls are hardly unexpected in many parts of the world.

For the very few of us who will ever pilot a jet at high altitude, deciding whether or not to fly in the fast-moving, eastward-blowing jet stream will be fairly easy. If you're flying west, you ...