Researchers studying the movement of crowds at a traditional Spanish festival have shown that densely packed groups of people form swirling ‘vortex’ patterns never before documented in human ...

The polar vortex, a swirling mass of cold air located over the polar regions, is responsible for the cold. It's bringing extreme cold as far as the Deep South. Overnight lows will be well below ...

When the winds come together to create a swirling vortex over a covering of snow, it picks the flakes up off the ground, creating a whirling column of the cold stuff. The WMO calls the phenomenon ...