This system exists year-round but strengthens in winter, creating a swirling mass of frigid air high in the stratosphere.

When the vortex weakens or becomes disrupted, it can send waves of Arctic air southward, leading to extreme winter weather in the United States.

Polar Vortex Visualized

This animation depicts a polar vortex-driven cold air mass (yellow) surging eastward across the central and eastern U.S., creating a sharp temperature contrast. The western U.S. remains under colder (purple/blue) conditions, while localized turbulence or strong winds appear in the Rockies.

This pattern suggests a significant cold outbreak resulting in:

Heavy Snowfall and Ice Storms

The influx of Arctic air interacting with moisture from the Gulf of Mexico can trigger major winter storms, producing heavy snowfall, ice accumulation, and hazardous conditions from the Midwest to the East Coast.

New Snow Layer

Prolonged Cold Spells

If the polar vortex remains displaced for an extended period, regions can experience longer-than-usual cold spells, affecting agriculture, energy demand, and transportation.

Freezing Altitude Layer

Regional Weather Extremes

While much of the country faces frigid conditions, some areas, particularly in the western U.S., may experience unusual warming as the jet stream shifts.

Extreme Forecast Layer