Definition
Forms on the polar front where cold and warm air masses meet, then deepens as it tracks generally eastward, typically at 20 to 30 knots in the temperate zone. Its classic structure has a warm front ahead, a warm sector, and a faster cold front behind that eventually catches up to form an occlusion. Winds circulate anticlockwise in the Northern Hemisphere and back then veer sharply as the fronts pass.
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