Brrr! Temperatures have plunged across the U. S. , with Winter Storm Blair bringing snow and winter alerts to millions. This isn't just any cold snap; it's tied to the Arctic, where warming can push cold air south. Climate change might be making these cold snaps more likely.

The polar vortex, a spinning band of cold wind, and the polar jet stream, a fast-moving air current, work together to control the Arctic's chill. When these rings change due to warming, cold air can escape south, affecting places like the U. S.

Scientists are studying how human activity, like burning fossil fuels, affects these weather patterns. The Arctic is warming faster than the rest of the planet, weakening the temperature difference that powers the polar jet. This can make cold air more likely to wander south.

Oceans warming and sea ice loss also play a role. Warmer oceans can push tropical air north, changing the jet stream's path. Less sea ice can reshape the polar vortex, letting more cold air escape.

But not all scientists agree that climate change is the main cause of recent cold snaps. Some think that while winters are getting warmer on average, extreme cold can still happen.

Maybe the most important thing to know is that preparation matters. When a cold snap hits an unprepared area, it can be deadly. Forecasters are getting better at predicting these events, so we can be ready.

Why is it so chilly? Blame the Arctic!

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