1. The Antarctic polar vortex is more pronounced and persistent than the Arctic one. 2. La Ni�a related climate anomalies significantly strengthen the polar vortex . 3. A "'polar vortex "'is an upper level low-pressure area lying near the Earth's pole. 4. Stratospheric warming of the polar vortex results in its weakening. 5. Strengthening storm systems within the troposphere that cool the poles, intensify the polar vortex . 6. The breakup of the northern polar vortex occurs between mid March to mid May. 7. The result is the polar air forms a coherent rotating air mass : the polar vortex . 8. Miner testified that the 2014 polar vortex contributed to the increase in Syracuse's water main break. 9. In the autumn, the circumpolar winds increase in speed and the polar vortex rises into the stratosphere. 10. However, at the outer boundary of the polar vortex , in winter, the stratospheric polar night jet exists.
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