The polar vortex is usually “like an aircraft carrier, it doesn’t turn around quickly and isn’t very nimble,” Cohen said. “I’ve really never seen anything like it.” ...

These polar vortex stretches are happening more frequently as the world — and especially the Arctic — warms, a 2021 paper published in the journal Science, also co-authored by Cohen, demonstrated.

These polar vortex stretches are happening more frequently as the world — and especially the Arctic — warms, a 2021 paper published in the journal Science, also co-authored by Cohen, demonstrated.