A sudden stratospheric warming event reversed the winds that make up the northern polar vortex on March 9. A new animation shows the vortex also moved away from the Arctic towards Europe.

An April cold snap is expected to bring unusually cold temperatures to the eastern half of the US next week. The cold snap could impact new spring vegetation and lead to frost in some areas.

February 2022 was also characterized by an extremely strong stratospheric polar vortex—a large spinning mass of cold air in the stratosphere around 15 miles above the Arctic that is prominent ...