Strength: The polar vortex strengthens in winter due to the deeper contrast between polar and equatorial temperatures and weakens in summer as temperature differences diminish. Normal Position ...

A developing area of upper-level arctic cold air will swing into much of the northern and eastern United States from Canada and will promote dangerously cold temperatures for central Kentucky and ...

When the Polar Vortex is in a weakened state, a jet stream wobble sending polar air into the mid-latitudes becomes more ...

Much of the United States has been buried in a deep freeze. And Kentucky faces the brunt of a polar vortex that continues to pour down through the middle of the country. Thankfully, Louisville Gas ...

Winter in the CSRA is usually mild overall, but every now and then, we get a taste of true Arctic air. If you’ve ever ...

The vortex is essentially an area of low pressure in the upper layers of the atmosphere over the polar region up north. This ...

Like much of the U.S., Wisconsinites woke up Tuesday morning to bitter cold conditions. Many schools and colleges throughout ...

Much of the country is in for widespread and dangerously cold temperatures beginning this weekend — and lasting through much of next week — as a lobe of the polar vortex over northern ...

two bands of fast-moving air – the polar jet stream and the stratospheric polar vortex – sometimes tango together to influence weather in the northern hemisphere. As the Arctic continues ...