north atlantic jet stream forecast. The North Atlantic jet stream forecast for the next seven days is shown below. The jet stream is a high altitude wind that tends to flow west to east.In each hemisphere, there are two jet streams, the polar & subtropical, see the graphic at the bottom of this page.Most of Europe experiences the polar jet stream, to north of which the air is cold & to the south it is warm.he North Atlantic jet stream forecast for the next seven days is shown below. The jet stream is a high altitude wind that tends to flow west to east.