When the vortex weakens—which it does on occasion—the jet stream becomes wavy, bulging south and allowing Arctic air to flow down across North America and Eurasia, causing temperatures to plummet ...

Vortex streets occur in liquids as well as gases. As fluids move toward a cylinder that is sticking up into the prevailing flow, that flow will split around the cylinder. The edge of the fluid ...

The polar vortex could be reversing in a sudden stratospheric warming event, with the potential to send Arctic air and storms ...

It’s really, really cold again – as the US shivers through at least the eighth blast of air from the Arctic this winter. Here’s why it keeps happening.

After Feb dumped a wave of unconditionally severe winter weather in the US, March is about to unleash those conditions again due to the polar vortex collapse.

These experiments examines the flow field in the region where a moving wall slides ... The transitional regime of vortex development is marked by the appearance of an instability on the perimeter of ...

At the centre of the vortex the fluid flow is well defined — it is either clockwise or anticlockwise — but in the outer region, the direction is less obvious, leaving the orientation of the ...

The vortex describes the counter-clockwise flow of air that helps keep the colder air near the poles. A 'collapse' occurs when the layer between six and 31 miles above the Earth's surface heats ...

When the polar vortex is strong, the jet stream tends to flow more powerfully and steadily in a circular pattern around the poles, effectively containing the cold air within the polar regions.