| 11. | These climates are in the polar front region in winter, and thus have moderate temperatures and changeable, rainy weather.
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| 12. | A boundary called the polar front divides cold, dry air from the warm, moist air that originates in the tropics.
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| 13. | As the Pacific High weakens and the polar front drops south, the region sees a doubling of the monthly precipitation.
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| 14. | This cold period sees an expansion of the polar front, with ice floating further south across the North Atlantic Ocean.
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| 15. | During winter, heavy swells are generated in the mid-latitudes, when the North and South polar fronts shift toward the Equator.
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| 16. | A boundary called the polar front, separates cold, dry air masses from the warmth and moisture that originates in the tropics.
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| 17. | A boundary called the polar front separates cold, dry air masses from the warmth and moisture that originates in the tropics.
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| 18. | A split in the jet stream will keep the supply of moisture separate from the potent disturbances along the polar front.
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| 19. | In this illustration, the Arctic front separates Arctic from Polar air masses, while the Polar front separates Polar air from warm air masses.
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| 20. | When the polar vortex is strong, there is a single vortex with a jet stream that is " well constrained " near the polar front.
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