A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the South.

WASHINGTON — In Earth's upper atmosphere, a fast-moving band of air called the jet stream blows with winds of more than 275 miles per hour, but they are not the strongest in our solar system.

Much of Mississippi is expected to see temperatures in the teens this weekend and into next week, with even Gulf Coast lows ...

A strengthened jet stream is driving severe weather towards the UK later this week, with strong winds of up to 90mph forecast. After grey but settled weather earlier in the week, Britain could face ...

They were still technically subsonic because they were propelled by a faster-than-usual jet stream. Recent cold weather strengthened the jet stream, and the climate crisis is set to exacerbate this.