In the atmosphere outside the movement horizontally, the air is also moving vertically. Vertical speed compared to the speed of movement of the air horizontally, then very small, but it holds a predominant role in the cause of the weather phenomena such as clouds, rain, thunderstorms ...In fact, the air disturbance and are putting up high, along a road, the road is called the strip of subtropical convergence. Otherwise, the strip of convergence where the markedly sharp lines. Along the strip of convergence, the influence of the wind speed and wind direction should air the pent back and elevated to high. The strip of convergence can extend from 500-600 to hang a thousand kilomets.The tropical convergence is a strip in the thười system can give huge rainfall to record levels on the wide area in the tropics, especially the độngcủa strip of tropical convergence back combined with other weather situation as the cold front, storms can form on the tropical convergence.
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