Polar vortex could bring harsh winter to U.S. east coast

The video explains the polar vortex, a counterclockwise flow of air that keeps cold air near the poles. During winter, the vortex can become unstable, causing cold Arctic air to move southward, leading to severe weather. This instability is linked to sudden stratospheric warming, where winds change and the vortex may split. Predictions suggest Eurasia will be affected first, with the lower 48 states experiencing effects weeks later.

What role does the vortex play in relation to cold air at the poles?

• It has no effect on air temperature.

• It causes the poles to warm up.

• It keeps frigid air closer to the poles.

• It disperses warm air to the poles.

What happens to the vortex during a sudden stratospheric warming event?

• The vortex is displaced and may split apart.

• The vortex strengthens and becomes more stable.

• The vortex disappears completely.

• The vortex moves towards the equator.

Which phenomenon is associated with vortex disruption?

• El Niño

• Tropical cyclones

• Sudden stratospheric warming

• Global cooling

According to forecasts, which region is expected to be affected first by vortex changes?

• North America

• Eurasia

• Australia

• Antarctica

How long might it take for the lower 48 states to feel the effects of vortex changes?

• Immediately

• A few days

• Weeks

• Several months