Will it snow in East Tennessee this winter? WATE's Ken Weathers looks at what's expected in December, January and February and how La Niña and Arctic Oscillation impact the forecast.

The Arctic Oscillation has positive and negative phases. During a positive phase, the upper-level polar winds are strong, reducing the likelihood of Arctic air spilling south.

Europe Poised for Blast of Arctic Cold as Gas Storage Drops Heating demand to surge as cold air trapped over region Weakening polar vortex is bringing much colder air from Arctic ...