The polar vortex, a mass of cold air over the Arctic, is beginning its seasonal strengthening. A strong polar vortex typically keeps the coldest air locked near the North Pole. A weaker or wobbling ...

Yahoo is using AI to generate takeaways from this article. This means the info may not always match what's in the article. Reporting mistakes helps us improve the experience. Generate Key Takeaways ...

The polar vortex is beginning to stir, signaling a gradual shift toward cooler, autumnal weather in the northern U.S. While temperatures are expected to cool, the Climate Prediction Center forecasts ...

Summer may end on a cooler note for parts of the U.S., with meteorologists suggesting that a weakened polar vortex could usher in below-average temperatures as September begins. In contrast to earlier ...

The Earth's polar vortex is stirring up, bringing the first hints at changing weather as fall descends on the U.S. This movement means gradual cooling and a more active storm track across the northern ...

The term "polar vortex" might have recently picked up in popularity, but the natural weather phenomenon has always existed near the Arctic. Known as a large region of low pressure and rotating air ...

Summer may end on a cooler note for parts of the U.S., with meteorologists suggesting that a weakened polar vortex could usher in below-average temperatures as September begins. In contrast to earlier ...